Why does my GMC Sierra 1500 not heat?

System won’t deliver to air flow to the proper place, ie defrost,floor,or ac vents. A/C works great but won’t change to heat when required. system won’t deliver to air flow to the proper place, ie defrost,floor,or ac vents. Air will be blowing cold and then just start blowing hot.

What should I do if my AC heater is not working?

One or more heater & AC (HVAC) temperature and/or air delivery mode door actuator may fail, resulting in improper temperature or air delivery. If this occurs, fault code (s) should be stored in the HVAC control module which should assist in diagnoses.

What kind of grade does a 2004 GMC Sierra get?

For being the so called a “Professional Grade”, I have had so many problems with my GMC, from the instrument cluster, steering column, bed liner, hubs, ABS, emissions, etc…. and now with the HVAC – I’d give my 2004 GMC Sierra a disappointing “F”.

Why does my GM Sparkys not blow heat?

The Passenger side would not blow heat on the “hot” setting but it would blow heat when set to “cold” on the Tech2. The temperature sensor readings were interesting as well. The outside ambient air temperature was reporting correctly; the Tech2 and rearview mirror numbers matched.

Are there heated seats on a 2004 GMC?

2004 GMC: heated seats The driver’s side heat keeps shutting off Hello and welcome to Just answer.com, Super mechanic here. About your vehicle. There has been a service bulletin for that type of concern. It involves a reprogramming of the driver seat module. The dealership (stealership) would have to do that, I hate to say.

Why are the vents blowing hot air in my Chevy Silverado?

I changed the battery and after the new battery was installed the driver’s side vents blew HOT air even with the AC set to 60. I tried disconnecting the battery cable for a few minutes, cycling they key off/on several times, adjusting the vents to dash/floor/front/etc, pulled the 10A HVAC fuse with the truck off…nothing worked.

Why does my GMC heated seat keep shutting off?

2004 GMC: heated seats The driver’s side heat keeps shutting off 2004 GMC: heated seats The driver’s side heat keeps shutting off Hello and welcome to Just answer.com, Super mechanic here. About your vehicle. There has been a service bulletin for that type of concern. It involves a reprogramming of the driver seat module.

How to fix Chevy GMC Truck heater blend door?

1999 – 2004? Chevy GMC Truck Heater Blend Door Stuck Easy Fix How-to – YouTube If playback doesn’t begin shortly, try restarting your device. Videos you watch may be added to the TV’s watch history and influence TV recommendations. To avoid this, cancel and sign in to YouTube on your computer. An error occurred while retrieving sharing information.

Why does my Chevy Silverado blow hot air?

Cold is cold, hot is hot on both sides. Just something to try, your results may vary. It is a 2000 and has a manual heater with only one zone. I suppose it is the actuator on the top of the heater box isn’t it??

What is the problem with my AC heater?

Problem Description. One or more heater & AC (HVAC) temperature and/or air delivery mode door actuator may fail, resulting in improper temperature or air delivery. If this occurs, fault code(s) should be stored in the HVAC control module which should assist in diagnoses.

Is the a / C on my GM truck really hot?

From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. I have a 2008 1500 4×4 4.3 V6 with 40000miles. Recently the ENGINE HOT A/C TURNED OFF warning pops up, but the engine isnt really hot. It seems to reset itself after a while.

How old is the air conditioner on a GMC Sierra?

The air conditioning started blowing hot air while moving. The truck is only 4 years old with 75000 miles on it. In doing research we have learned that this is a common problem with the GMC sierra’s and it not covered by gm even though it appears to be a design flaw.

What should coolant temp be when engine is hot?

With a good OBD2 code reader, you can also check the live data and the parameters of the CTS sensor. Check that the temperature value of the CTS is around 80-90c when the engine is hot. A lot of engine coolant temperature sensors have two wires and the sensor is controlled by Ohm.

What should the coolant level be in a Chevy?

The engine is (3.5) The coolant level is good and condition of coolant is good Chevy Mechanic: Bill, Chevy Technician replied 8 years ago Ok, as long as the cooling system is full and operating properly, what I would suggest is having the thermostat checked for proper operation and having the computer update with the latest software calibration.

Is the a / C only cold on the passenger side?

A/C only cold on passenger side. Drivers side blows hot. There is no adjustment on the drivers side for temp. If you turn off the truck and then restart, it might work for a bit or not.

How much does a GMC Sierra AC cost?

If this occurs, fault code (s) should be stored in the HVAC control module which should assist in diagnoses. The average cost for a GMC Sierra 2500 HD AC Diagnosis is between $53 -$67. Learn More

What to do if your Chevy Silverado has a heater problem?

With engine off, unplug air flow control module, replug in… can hear actuator motor running. Seems to cycle to “an end”, then return… motor runs a few seconds, then will not respond to any further commands unless unplugged and replugged. ’06 Chevrolet Silverado 2500 Duramax: Vents won’t switch properly at all.

How does the heater work on a GMC Sierra?

At the simplest level possible, the heater works by passing hot coolant from the engine into a tiny radiator called the heater core. At this point, the blower motor blows air across the it and the newly heated air blows on to the driver and passengers. If the heater has stopped working in your Sierra, this process has failed in one way or another.

How does temperature control work on a Chevy Silverado?

The temperature control has no effect controlling temperature. Sometimes its hot and sometimes its cold. The temperature cannot be set it has a mind of its own. Very frustrating to be in a vehicle that has no heat when its cold and the A/C pumps out hot air when it hot. Sometimes you can hit it lucky to where your A/C works when you want it to.

Why does my GMC Sierra 1500 not heat?