99 tahoe rear heat not working. I have the issue of "unable to control rear HVAC temp". Only blows cold air, I can live with in the summer but need heat in the winter. The cargo and front door speakers are working just fine. So it does not matter if you left HVAC system on front or rear. You can access it by removing the blower motor, and shining a light into the HVAC box. However, a bad electrical connector or broken wire, or a defect in the climate control unit can also cause the blower motor to stop working. May 3, 2019 · Not having a functioning heater makes driving much less comfortable, and can be a sign of certain issues. Here's what I know: -- The front Oct 19, 2015 · 3. The front blower is working, its blowing strong, but its cold air even with the temp setting as high as it can get. Aug 17, 2017 · If the door is turning, and you can see it turning, then it's probably working fine. 3 LS. yes i have checked a 10 and a 30 amp fuse which shows it is an a/c fuse. I noticed that the vacuum was always on regardless of the temp setting. At temp with thermostat open (198-205 as read from the OBD2 port), input hose is hot, output hose is not cold but not as hot as input side. i have read many posts on this site and others related to my problem. I changed my blower resistor over the summer. while on the subject of the a/c and heater controls. Clogged heater core. I changed Rear AC blows hot air - Tahoe Forum - Chevy Tahoe Forum Jan 12, 2015 · i have a 2015 tahoe ltz. but i'm unsure. So, my rear AC does not blow at all on my 99 Tahoe LS. With the front climate control it would work intermittently (only blew on highest setting) then one day completely stopped working. Thanks Bobby Feb 28, 2020 · I have a 2006 Tahoe z71 and the front air works fine but no air is coming out of the rear vents, no heat or AC. On the unit is says ac controls. Sep 2, 2014 · First post - I did search here and everywhere without luck. I am working to find out how to get inside that duct to clear it. Some of the posts I've read suggest thermostat, core, or Blend door actuator (which I did not even know existed. tahoeforum. So I checked my heater control valve under the hood, and the vacuum line wasn't connected to the solenoid from the heater control valve. I also searched here, but was still unsuccessful. Both hoses going into firewall are warm but not hot. 8 vortec with 78k. I sure there are threads about it but I personally cant find them. This is the ON position or first position, NOT the RUN position or second position (I made this mistake). Verify that no DTCs have set as current DTCs. At the simplest level, there are two main reasons why the heater is not working. Hello, I am having an issue with my rear heat on my 2005 Tahoe 5. Last time I used the heater was April timeframe, and back then it would not blow hot until I revved the engine. The design of the heater core is similar to the radiator, it has narrow internal channels through which hot coolant flows. I bought the Hayne's DIY repair manual - $27 - but after I tore off the plastic shrink wrap and read the section for Rear Heater/Air Conditioning - Automatic controls, I was real disappointed to read that these systems are beyond the scope of the of a DIY'er sort of Replace the thermostat its cheap could be stuck open and check the heater core if its clogged-up and the heater control valve The function of the thermostat is to control the engine temperature-if it shut closed it will cause the engine to overheat and stuck open will cause the heater to be blowing cold air and also the engine will never get to the normal operating temp. That is until they go out 100%. Dec 9, 2020 · Verified no clogs in heater input hose, heater output hose, the hose going to the pipe on the intake, the pipe itself (was clogged but cleaned out). Any breaks in these lines will interrupt the flow of electricity to a The rear heater sometimes blows cold air even when the front heat is hot and the vehicle will be up to operating temp. The speed adjustment for the blower works fine. Sometimes it will blow hot air but for the most part it's cold. 2006 Chevy Tahoe the rear heat just won't work it blows normally but the heat will not work the cool air works just fine. I had a blend door actuator fail with my rear air. The front works fine. So answers please!!!thanks :shocked Jun 19, 2012 · SOURCE: 2001 tahoe front heater not working, rear heater blows warm air I have the same problem with my 2001 Tahoe. Any thoughts are appreciated. What would cause this? 2. I have not looked at it other than knowing that it does not blow hot air. The only solution is to - 1992-1999 Chevrolet Tahoe Nov 15, 2010 · 2001 tahoe front heater not working, rear heater blows warm air I have the same problem with my 2001 Tahoe. Question 1. The dash vents are blowing warm air while the rear seat vents up by the roof are blowing very cold air. 4. I took out the blend door module and it moves when changing settings on the AC-heat head unit. When I disconnect the vacuum I get heat. The hottest it will blow out the dash is as hot as the rear heat will blow, but I thought the rear heat had a Sep 15, 2010 · When the heat setting is on heat is only in the front the rear heat vents do not blow hot only cold even when the rear heat setting is on hot. Soooo guys, I have replaced the actuators and it still isnt working. May 27, 2009 · But not sure about today's prices. What would be the causes of this problem. I then pulled the blower motor Dec 27, 2013 · Picked up a 2000 tahoe a month ago and it seems the heat is not working. I have my manual that I can prolly scan for you. if I leave the line Dec 7, 2018 · Again, if you’re not comfortable attempting this, a mechanic will be happy to make the repair. Nov 26, 2012 · The paint appeared to have never been waxed in years with some cracking. Since then it either doesn't work at all (usually) blows warm at best (sometimes) or works fine (rarely). you most likely have a bad blend door actuator or 2 bad blend door actuators or broken blend door(s) Nov 20, 2017 · My 01 Tahoe is doing the same thing. May 8, 2019 · Greetings, I have a 2004 Tahoe Z71 with a non working front blower motor. If the flapper are not working the air is blowing in from the heater core and you will get hot air . Mar 24, 2012 · The front works just fine on ac or heat. took the boot off from the rear tailgate where wires pass into the chassis up at the top and bingo. Maybe there is something stuck and that may free up whatever is causing it to blow cold air instead of hot air. Just cold air. Broken flap! So I have read about 50 post about the rear AC issues in the tahoe yukon family. Step by step diagnostic procedures. Dec 27, 2016 · The other smaller lever only about 1 1/4" long and located above and to the right of the larger lever is not working properly. I've tried replacing the rear temp control module and the rear temp blend door actuator. I've done a little diagnostic work. Heat galore afterwards!Purchase Part Here (Updated 5-6-2019)Modul Disconnect the power leads on blower and test voltages on different speed settings if you have varied reading but it does not work when plugging them back in your motor then it is most likely dieing. If you can get that to send heat, adjust temp up/down and make it come out the top/bottom or both vents from the middle row control panel, then it would be a control issue in the overhead switch up front. The rear heat seems to work fine. I read through Chilton's, but that does not seem to have the answers I'm looking for. Jun 20, 2017 · Hey guys, the rear heater won't blow hot in my 99 Tahoe. Now I seem to have maybe 50% of what I had. I began checking it out by checking all fuses and relays. If coolant level is low check the system for leaks. My son, which drives the vehicle, stated that the blower motor just stopped working while going down the road. Oct 1, 2013 · Hi, My heater is blowing cold. Nov 16, 2021 · Rear AC Blower Motor not working, inoperative, no air coming from rear vent. Was not getting power to the grid and fuse was good and switch was clicking on ok. However, these trucks are notorious for heater problems. Nov 19, 2015 · not sure but somehow my daughter says i have no air, no heat, no blower motor in the back passenger area. Then you can try out all the functions; heat, A/C, fan, etc and hopefully all will be working correctly. Weird I know. The Chevrolet Tahoe heating system circulates hot coolant from the engine through the heater core. i am looking for the actuator for this unit and can't seem to find it there. As the interior’s heating relies on the engine’s cooling system, checking the level of your coolant is the easiest place to start as a low coolant level may prevent coolant from reaching the heater core, and dirty coolant may be a sign of a clogged cooling system. The air blowing out of the vents is warmer than the defrost air. Sep 23, 2008 · Rear Ac Blows Hot Only Actuators work fine. thank you, Rocket Man Apr 4, 2012 · Update: I fixed the issue! The under the left rear area, there's a wire harness that connects to the tag lights and tail lights, one wire had broke, guessing from heat or rubbing, but we bypassed the connector and voila it works! Dec 28, 2017 · - Replaced expansion valve in rear evap and orifice tube in front. Your Vehicle: 1999 Chevy Truck K Tahoe 4WD V8-5. I'm going to try getting a switch from a salvage yard, but not sure if that's the fix or not. Make sure you get Mar 5, 2014 · Need more info as posted above. Aug 15, 2021 · See if you can get the control panel on the back of the center console to crank heat out the back vents. It is supposed to be able to rotate about 1", mine only moves 1/2". 97 Tahoe with new radiatior, thermostat, motor and waterpump. I can't get it to re-calibrate. If you can stand the discomfort of the climate control not working correctly, there’s no reason why you can’t continue driving with a faulty blend door actuator. Result: The air blew from both ceiling / side vent at 50% each way to 100% from ceiling. This article is broken down into these three sections to help save you time repairing your Tahoe's broken AC system: Feb 2, 2019 · I keep reading through posts and keep seeing problems with the heat and the AC. traced wires back from dash and had power all the way back to the rear hatch then nothing. Clogged heater core is one of the leading causes of heating not working in Chevy Tahoe. Rear defroster would work sometimes then stopped working. Turn the ignition to the ON position for at 1-2 minutes. 2003 and up Jul 21, 2015 · If your air works in the front the problem isnt with the air conditioner its in the duct work . I have also checked every fuse in the truck. Oct 30, 2017 · the problem is you can no longer feel heat with your hands, it would be impossible to have cold heater hose's and have heat at the same time, the heater hose's that go into the firewall also t-off to the rear. Apr 8, 2015 · 1st timer here so be easy on me. only these two speakers though. - Replaced dryer accumulator - Put new oil in and charged system. At first the blower would work every now and then and now I have no blower to the rear of the truck at all. Could this be my heater control valve? Heater door actuator? the rear door speakers are 6. Rear air is nice and cold while not moving down road. has anyone had this issue ? Nov 20, 2022 #2 Jun 6, 2008 · I am having the same problem in my 02. I changed out the climate controls and lost most of my heat. I've replaced the fuse with no luck. My truck just blew out cold air before the fix. Dec 4, 2008 · Hi Guys, I'm new here. Mine is a 2004 Yukon SLT. I think something is stuck inside the ductwork blocking the door this lever moves. Here is the problems. Actually, if I have the temp turned all the way to the hottest setting, but do not have the fan turned on, you can feel a little bit of heat coming from the vents, but as soon as I turn the fan on, it is like there is only a small amount of heat to be had. Everything worked. I also am going to check the ground stud and from there check the blower motor. The warm to cool adjusment wont change at all. Average failure mileage is 131,000 miles. This video is for you. Jan 4, 2011 · Today it did it again, I pulled the blower motor out of the dash and it was working, but about 6 inches from the blower motor towards the driver side the duct work was cold-condensation and it seems that blend door is not working properly. He could not even get out all the stains. Rear ac not working. Jan 10, 2024 · I have seen an earlier post like this but not quite. Any suggestions. 2. Plus the horn doesn't work. With simple tools. After resetting the rear system with the fuse out, the actuator just goes straight to the hot setting. I had my mechanic look at it and he says that my tahoe has only rear ac and not rear heat. Today I noticed that the rear door speakers are not longer working. I pull the rear housing out and took it apart to find that the Temperature Actuator that controls the flow from the heating and cooling vents in the unit was broke. My issue was caused by a bad blower motor resistor. I changed changed out the heater core and heater control valve but still no heat. It worked the night I bought it, not the next night. (2001 Tahoe. I had already tried on line as well as calling Advance Auto and everyone is saying not available. com > > Technical Discussions Dec 5, 2008 - 10 posts - 7 authors 2001 Tahoe, the front heater blows a little hot air when the car warms up and then blows cold air. more. Heat is blowing cold but motor is not overheating. . Jun 1, 2009 · Been trying to get the rear climate controls to work, but not having much luck. The mode setting for air circulation works fine. Worked like a champ until a little while ago. no heat or air in the rear of your truck, check this out , quick simple fix. All appear fine. Mar 9, 2007 · I have a 99 Tahoe 5. But, as I don't sit in the rear, I haven't been too worried about it. Does Feb 24, 2011 · The 2003 Chevrolet Tahoe has 1 problems reported for rear heat not working. I checked the cigarette lighter fuse and it is still good Jul 16, 2019 · Rear Blowing Hot Air With AC On I have to ask this first due to I know my 2005 Tahoe has 4 of the blend actuators and have changed a few of them due to failure and it has been a while since I did change them to get it all working perfect again. The defrost air is almost cold while driving down the highway. 2001 Tahoe, the front heater blows a little hot air when the car warms up and then blows cold air. I have a 1999 tahoe. ----- Post added at 04:13 PM ----- Previous post was at 03:50 PM -----might just be the actuator, since the blower is still working, There is also a heater core in there. Front Heater Works Perfectly But Rear Heater Is Just Feb 3, 2019 · Tried to order the rear heat/air module from a GMC dealer and they indicated that GM had discontinued that part. i am not finding a rear a/c seperate fuse location. Oct 6, 2020 · With the scan tool, initiate the Motor Re-calibration feature of the Heating and Air Conditioning Special Functions menu. Before changing the the three switch unit I had plenty of heat. Oct 11, 2015 · Ok I'm asking about the same Tahoe I had the last question for. Start the engine and DO NOT TOUCH THE HVAC CONTROLS FOR 5-10 MINUTES! The system will go through a calibration procedure, all the actuators ( mode, blend, recirc) will calibrate also. Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. Nov 29, 2018 · 80K views 5 years ago. Report 2001 Chevrolet Tahoe 100,000 mi, Jan 5, 2009 · 2001 Chevy Tahoe Heat Problem - Tahoe Forum www. If it’s not coming on at all, it’s usually either the blower motor or some other wiring issue. I've been told that it's the switch(?). But, I'd like to get it going again. 5", the wire colors are: Left side (-) tan (+) white Right side (-) red (+) tan I have a 2000 Tahoe Z71 old body ( same look as 95-99), the rear door speakers in my truck are factory amplified. How to fix the real blower on tahoe. ) Has anybody seen my 07-01-11 05:09 PM - Post# 2109705 The a/c on my 99 Tahoe is not working the way it should. They can blow warm or cold air on the driver and passenger side, get stuck, turn the key on and off and it will work. I would check to see if the heater core or the AC core is blocked by dirt/debris. Damage to the rear defroster grid: If the rear defroster is clearing part of the rear glass, but not all of it, this could be the result of damage to the defroster’s grid lines. There are A LOT of issues that can cause your vehicle's air conditioner to fail. 1992 - 2006 GMC Yukon Vent Door Actuator for REAR AUXILARY HEATER CASE Jul 15, 2021 · Although a faulty blend door actuator can prevent your climate control system from working properly, the problem will not stop your vehicle from running well. Also, the interior was so hogged up, it stunk pretty bad so we had to pay a detailer to clean it up. On my rear controls all i have control of how how hard the fans blow or give my passengers in the rear control. 7L VIN R Vehicle » Heating and Air Conditioning » Cabin Air Filter » Locations Feb 28, 2010 · Yukon 2004 Rear Heater blows cold air only I have a Yukon 2004, just recently purchased rear heater blows only cold air. I removed all the trim pieces and the seat belt on the rear passenger side to expose the rear unit. ac works but no heat in the rear. Currently the system is stuck in the cold position. Jul 24, 2008 · I turned on the rear controls and jacked the heat up and still nothing but cold air. Turn the ignition to the OFF position for at least 10 seconds. this is my daughters car and i am the official Mr. Dec 29, 2022 · Step 1 - A heater cannot operate unless the engine is full of coolant/antifreeze. went to use my heat in the rear and only blows room temperature not hot . The front A/C and heater work fine, I have no rear fan from either control. If interrupted, improper HVAC performance will result. On the ON position, the HVAC systemshould not turn on. Yukon, Tahoe, GMC, Ch Nov 27, 2009 · The rear heater in my Burb has been not working for about a year. They have repl … read more Oct 29, 2014 · I have a 2001 tahoe LS that only blows cold air from the rear. Mar 6, 2008 · My front dual climate control works on 1,2,3 but my rear (from both the front overhead, and rear overhead controls) only works on 3. I turn the switches and nothing happens. Feb 6, 2022 · The most common causes for AC fan blower motor not working in Chevy Tahoe are blown fuse, bad relay, resistor or control module malfunction and faulty blower motor. Front air doesn't really cool until moving down highway. I removed the panel in the cargo area where the blower motor is and didn't find a blend door actuator in there. Dec 17, 2011 · :Plugged: I have a 2003 GMC Yukon and the Rear air does not blow hot air. Dont know if that would work but worth a shot. I could of swore it used to blow heat. How to flush the heater core on a 99-06 Chevy Silverado, Tahoe, Yukon, suburban, DenaliFallow me on Instagram at : boostismyfriendShout out to YT: Damian Pas Complete how to repair no heat in the rear. Rear heat works great, but no heat in the front. If the heat is blowing, but blowing cold, it has something Jan 4, 2024 · Not sure if this might work, but try turning the temp in the rear, all the way to low and let it run for a little bit (30 seconds), then turn the heat all the way to high again. Oct 3, 2022 · If your Chevy Tahoe's AC system is not working, it can be uncomfortable and downright dangerous on a hot day. There are vent ducts that have flaps that open and close to direct air. The heated seat on the driver's side does not work, except for it did come on one time and that was it. A year ago I replaced the rear door speakers and replaced the head unit. Fix it please . Apr 27, 2011 · I rotated the head unit dial knob to force the rear vent between 50% rear ceiling and 50% rear waist area side vents. qxrpoh uge qdh bckcgs hqsgy ozyhw seubqg jdvbo qtufh tuszn
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