How does the heater on a GMC Yukon work?

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 Yukon, this process has failed in one way or another.

Why does my Chevy Camaro heater not work?

They both should feel warm or hot to the touch with the engine on. If one of the hoses is hot, and the other one is cold, that is a pretty good indication that the heater core is clogged. If the neither hose has any heat, you may have air in the cooling system, low fluid, or low pressure.

What to do if your Tahoe has no heat?

2003 Tahoe No Rear Heat Fix, Suburban, Yukon XL Repair! – 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.

Is the front of my truck warm or cold?

The front and rear where blowing warm air with the temps set at 60 degrees max. Today, I decided to purchase the EZ-CHILL from Advanced Autoparts to recharge my system (low-side).

Is the front of my GM Truck warm?

The gauge never went past 45psi when recharging and the front vents where still warm afterwards. This morning I decided to turn on the ac in the front while driving to work and the air was cold but it could be colder. I went and bought another can and will recharge again at lunch time and post my results.

Why is my Chevy Suburban heater not working?

Is there isn’t enough line pressure, due to low coolant, then the heater core will not be able to get any coolant itself. You can verify this by checking the coolant level by taking a peek at the overflow reservoir. The overflow reservoir will be connected to the radiator by a tube coming from the top (usually right by the radiator cap).

Why is the heater not working on my Buick Enclave?

Not having a functioning heater makes driving much less comfortable, and can be a sign of certain issues. At the simplest level, there are two main reasons why the heater is not working. If it’s not coming on at all, it’s usually either the blower motor or some other wiring issue.

When was the GMC C / K HVAC unit last used?

This Heater AC Control Unit was used on the 1996-98 line of Chevrolet and GMC C/K Pickups, and on 1996-99 GM Suburbans, Tahoes, and Yukons. It was no longer used after 1999, due partly to unreliability, and partly due to upgrades to newer technology.

Why is my climate control unit no longer working?

It was no longer used after 1999, due partly to unreliability, and partly due to upgrades to newer technology. The most common problems with this vintage of AC Delco climate control systems are failure of ventilation door servos, and failures of the control unit. This document pertains to the control unit.

What causes a GMC CK HVAC unit to malfunction?

This is caused by an open Switched +12V power transistor, or it could possibly be caused by a defective blower speed switch. This is caused by a shorted Switched +12V power transistor, or it could possibly be caused by a defective blower speed switch.

How to install a HVAC controller on a GMC Yukon?

Unplug the electrical connectors from the HVAC control assembly. WARNING- Make sure the ignition key is in the OFF position when connecting the electrical connectors to ensure the proper calibration of the control panel. 1. Engage the electrical connectors to the HVAC control assembly. 2. Install the HVAC control assembly.

Why does my Yukon Denali have no air?

Here’s how I resolved the no rear air problem in my 2006 GMC Yukon Denali. Rear air controls just show “OFF” when you try to power them on. I’ll answer them one at a time. This is actually working as designed. The rear air controls are only active when the front fan selector is set to “AUX”.

How to install a HVAC controller on a Chevy Tahoe?

1. Engage the electrical connectors to the HVAC control assembly. 2. Install the HVAC control assembly. 3. Install the accessory switch assembly to the instrument panel. 4. Install the screws from the HVAC control assembly. 5. Install the instrument panel storage tray.

What kind of climate controls does a GMC have?

You are currently viewing GMC.com (United States). Close this window to stay here or choose another country to see vehicles and services specific to your location. Your GMC is equipped with climate controls that allow you and your passengers to stay comfortable – whether you’re braving the heat of summer or the chill of winter.

Are there rear air controls on a Chevy Tahoe?

Rear air controls just show “OFF” when you try to power them on. I’ll answer them one at a time. This is actually working as designed. The rear air controls are only active when the front fan selector is set to “AUX”. If you have it set to auto it mimics the front temperature. If you set it manually, then it simply runs at the speed you set.

What should I know about rear air conditioning?

Any kind of problem related to your rear air conditioning system will be covered in this video, from your blower motor, to expansion valve, actuators, or res… AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features

Why does my Chevy Tahoe have no air?

Ever since I bought my 2003 Tahoe LT 4×4 in summer 2008, the rear air (heat or a/c) won’t work. No air will come out, the blower motor doesn’t seem to turn on. The dealership said they would fix it if it wasn’t the A/C (which it wasn’t).

Why is the blower motor not working on my GMC Yukon?

All appear fine. I then pulled the blower motor out of dash and determined there was power to the plug at the motor. I bench tested the blower and it worked fine. I have power from the switch to the blower resistor and from the resistor to the motor. Plugging the resistor back in, plugging the motor into the resistor but the motor fails to work.

Why does my GM front blower not shut off?

GM has issued a technical service bulletin (TSB) #06-01-39-002B to address problems with the front blower motor. In some cases in cold weather the blower motor may not run, or if it does, it may not shut off when you turn off the vehicle. The TSB applies to the following vehicles with automatic temperature control:

Is the front blower on my Tahoe Z71 not working?

Stockton, Ca. Greetings, I have a 2004 Tahoe Z71 with a non working front blower motor. My son, which drives the vehicle, stated that the blower motor just stopped working while going down the road. I began checking it out by checking all fuses and relays.

What kind of car heater won’t stop running?

Heater fan won’t run, Heater fan won’t stop running – GM products, Ranier, Escalade, Avalanche, Silverado, Suburban, Tahoe, Sierra, Yukon, Envoy GM has issued a technical service bulletin (TSB) #06-01-39-002B to address problems with the front blower motor.

How is the heat in my Silverado truck?

First, and most important problem: The heat in my truck is virtually non-existent. After about 10 minutes, it will blow warm air (not hot), but only if it’s above 40-45 degrees. Anything under that (40 and below), it blows kind of lukewarm air, barely warmer than the inside temperature of the truck.

What happens when there is no heat in a truck?

After about 10 minutes, it will blow warm air (not hot), but only if it’s above 40-45 degrees. Anything under that (40 and below), it blows kind of lukewarm air, barely warmer than the inside temperature of the truck. Well, not having heat makes me cold, and I don’t like to be cold at 6:45 in the morning.

Why is my heater not working on my Buick Encore?

If you have a heater core that clogged, it’s not going to be able to pass coolant through. Without the warm coolant going through it, there can be no heat. A bad heater core can also leak, so watch out for that. Feel your passenger floorboard to see if it’s wet.

Why is my Acura MDX heater not working?

If the heat is blowing, but blowing cold, it has something to do with the coolant getting to the heater core, or the heater core itself. At the simplest level possible, the heater works by passing hot coolant from the engine into a tiny radiator called the heater core.

Why is my GMC Yukon XL heater not working?

While there are a variety of reasons your GMC Yukon XL 1500 heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor. See what others are asking about their GMC Yukon XL 1500.

What to do if your Ford Fusion heater is not working?

When the blower motor resistor fails, the air conditioner and heater may still work, but air may blow from the vents at only some of the fan speed settings. If the resistor isn…

Why is my Acura RDX heater not working?

A failing heater hose may cause the vehicle to smell of engine coolant under the hood. If coolant runs onto the heater core inlet or outlet, the cabin could begin to smell of co… Read More The bad thermostat can cause two different sets of problems, depending on whether it’s stuck open or stuck closed.

When the blower motor resistor fails, the air conditioner and heater may still work, but air may blow from the vents at only some of the fan speed settings. If the resistor isn…

Why does my blower fan not work on high?

Blower Fan Works on High Only This is a classic blower motor resistor problem which is common on older cars and trucks that use manual fan speed switch controls. This problem will also occur on climate control systems when the speed controller has burned out omitting full power to the blower motor. This can also occur with the ignition key off.

Why is my Yukon XL not getting cold?

The A/C in my 2004 Yukon XL wasn’t getting cold any more. I figured it was a basic freon leak. Dealer said the control module needed to be re-programmed. Charged me 2.5 hours labor at 95 $/hr. They could not explain what went wrong or why it needed to be reprogrammed, they just said that is what needed to be done. Did I get duped? Ouch.

What kind of problem does my GMC Yukon have?

I’ve got a 1997 GMC Yukon (bought in 2001). Anyways, it’s always had this problem: the fan starts blowing, I can feel the faintest leak of hot or cold air out of the vents, but no air comes out of the vents. This is an intermittent problem.

How does the heater on a GMC Yukon work?