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:

Why does my car fan keep running after I Turn Off the engine?

Running cooling fans help cool down the engine even after you turn off the car. Common Causes. If your cooling fan runs for over 10 minutes after turning off the engine, you may have a problem that needs to be fixed. Here are some possibilities causing the fan to stay running longer. low coolant level, faulty coolant temperature sensor,

Why is my Chevy TrailBlazer EXT not turning off?

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Why does the radiator fan run all the time?

The radiator fan may run up to five minutes and sometimes longer. Unless there is an electrical issue, it may stay on all the time until it drains the battery. When the engine is running, the coolant circulates from the engine and flows to the radiator, where heat is dissipated.

Are there any problems with the Chevy Trailblazer cooling fan?

Chevrolet Trailblazer owners have reported 60 problems related to cooling fan (under the engine and engine cooling category). The most recently reported issues are listed below. While highway driving with cruise control engaged I heard a loud whining sound and experienced a sudden loss of power.

Why does my blower motor keep running after I shut off the car?

Some customers may comment that the blower motor is inoperative or continues to run after the vehicle has been shut off. These conditions may be caused by a blower motor control module failure.

Are there any problems with the Chevrolet TrailBlazer?

See all problems of the 2006 Chevrolet Trailblazer . The contact owns a 2003 Chevrolet Trailblazer. The contact stated that the fan clutch was failing and sounded like a plane taking off when pressure was applied to the accelerator pedal. She first noticed the failure in July of 2008.

Why is my Chevy Trailblazer making a loud fan noise?

Just as many other 2002 chevy Trailblazer owners have found, one day there was a loud fan noise when accelerating, reduced gas mileage, and a lack of ability to accelerate that lasts for about a mile. After a few minutes of searching on the internet it is apparent that my problem is the fan clutch, TSB 060602003, NHTSA 10019510.

Why is my a / C blower not blowing?

A metal that when it corrodes, it turns white, and unlike copper, aluminum corrosion does not conduct electricity at all and causes resistance issues and can cause overheating of a circuit. Took out a common finger nail Emory board and went to work, both sides of each contact, then used a small brass brush on each side and along the tips.

What to do if your AC or heater is not blowing?

If your Blower Motor for the AC or Heater suddenly stopped blowing, look here first, it might save you several dollars. Situation, we have a friend that owns a 2017 Chevy Trax LT, she is a nurse who works with my wife, single mom and on a single mom budget.

Where is the blower resistor on a 2017 Chevy?

Hit the A/C button, compressor is coming on, so not a low Freon issue. On the 2017, I located the blower resistor plugged into the duct on the passenger side, upper left area of the foot area, was surprised to find out that it could be accessed without even removing the cover for the blower area.

Why does my Avalanche heater not turn on?

I have a 2002 Avalanche with a heater control that blows hot air regardless of the temp setting. Even when the control is set to off, it blows cold air. The A/C button will not will not turn the A/C on. Any suggestions on what to replace or check out?

What kind of problem does my Avalanche have?

My 2004 avalanche just started doing the same thing. cold air drivers side, hot air passenger side. I just got a letter from GM regarding this very problem with my 04 Avy.

What causes the AC blower to stop working?

The problem is described as a faulty connector which allows moisture over time to enter the blower resitor assembly inside the AC/Heater assembly that will cause the blower to stop working or only work on certain speeds – Scary part there is also a faint burning smell sometimes associated.

What’s the climate control on a Chevy Avalanche?

Ichanged the battery and now the climate control blows hot air on the drivers and cold air on the passenger side. I have tried auto and manual no change. help…. robyr :confuse:

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.

What to do when your fan won’t shut off?

The fan switch on the thermostat is in the auto position, not the on position. You tried turning the thermostat to the off position, nothing works. The only way to get that pesky fan to stop running is to shut it off at the breaker or the Emergency Shut-off switch.

Why is my furnace blower fan not turning off?

Limit Switch Issue | Furnace Blower Fan Wont Turn Off If the furnace overheats, then a limit switch will open. That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again. In some cases, the limit switch will stick open, and this will cause the fan to run continuously.

Why does my Chevy Tahoe heater not shut off?

There’s not alot of room to work especially if you have big hands like me. Today is Sept 22 2014. CHEVY TAHOE 2005. HEATER BLOWER WON T STOP WHEN ENGINE SHUT OFF . WHEN ENGINE RUNNING NO CONTROL ON THE BLOWER SPEED .WORKED AT ABOUR 2/3 OF MAX SPEED . REPLACED MYSELF THE BLOWER RESISTOR .TOOK ME 2 HRS MAX .

Why does my blower motor not shut off?

Took my climate controls out and the fan continued to work, ended up pulling the 40amp fuse in the engine bay to shut it off so I don’t kill my battery. Whats the problem? Bad harness? Relay?

What does it mean when your furnace won’t turn off?

Believe it or not, it’s a more common problem than you’d think… A furnace that isn’t turning off is usually the result of a thermostat that’s set too high, a thermostat that’s gone bad, a bad blower motor switch, or filters that have to be replaced.

What should I do if my RV furnace is not working?

In case it is less at 10 V then one of the onboard batteries is likely to be the issue. Without adequate electricity being supplied to the furnace or the thermostat, it might not be able to fire, and the fan may or may not work at all. Consider swapping to a backup battery which can generate in excess of 10 Volts, if feasible.

What should I do if my blower wont shut off?

If the blower stops with either of these steps, the problem is in the HVAC control module. However, if the blower continues to run at high speed with either of those tests, replace the blower motor control processor. Just as an FYI, the retail price of the blower motor control processor is $280.34.

When to replace the blower motor control module?

The TSB applies to the following vehicles with automatic temperature control: GM has identified the blower motor control module as the cause for the failure. The problem only happens when the outdoor temperature is -10°F or below. To fix the problem, replace the blower motor control module.

Can a Silverado blower stay on with the key off?

The HVAC blower in this 2003 Silverado stays on speed 5 even with the key off. Here’s how to turn speed 5 of the blower off (while keeping speeds 1-4) and hopefully this will save you from replacing the battery. NOTE: GM issued a special coverage policy for this problem which covers the repair for 10 years or 150k miles, whichever comes first.

What to do if your Silverado won’t shut off?

I have an “02” Silverado that won’t shut off with the key. The key works like normal but engine keeps running, Anybody have any ideas? Sounds like the ignition sw. to me. Any help will be appreciated, Thanks. Click to expand… To get it to shut off? Pull a main fuse from the underhood fuse panel.

Why does my Chevy Silverado blower not turn off?

This 2004 Chevrolet Silverado came in with the complaint that the blower motor will not turn off even with the key off. This is relatively common problem of the the full sized Chevrolet, GMC and Cadillac trucks with auto a/c controls. The first step is to lower the passenger side hush panel under the dash.

Is there a way to turn off the blower motor?

My blower/heater motor switch will not turn off the blower nor willl it change the motor speed. It’s currently stick on high. Even if I turn the engine off and take out the keys the blower is still running. I had to discoinnect the battery to get it to stop.

Why does my blower motor keep running after I cut it off?

My blower motor is staying on even after I have cut the truck off and opened the door. helpful? Some customers may comment that the blower motor is inoperative or continues to run after the vehicle has been shut off. These conditions may be caused by a blower motor control module failure.

Why does my GM A / C heater not shut off?

Customers may comment that the A/C blower only operates on high or repeat blower resistor failures. Cause is a mis-positioned harness from the blower motor assembly to the right I/P fuse block C4 causing harness rub through at right I/P metal support. Repair wiring and reposition blower motor harness away from the right I/P support.

What does Black Wire mean on GM blower?

The black wire should indicate a strong ground. If you have a good ground and verified power into the module, yet have no electricity flowing to the fan you probably have a bad module.In many cases when I find the problem with the GM blower control module I also find signs of moisture in the heater case that contains the motor and module.

Where does the air come from in a GM blower?

As an example, if you select defrost, the mode door points all the air at the windshield. If you select heat, then the air will be directed at the floorboards. In the AC mode all of the air should come out of the air conditioning vents. If you select blend, then you’ll get air coming out of all of the positions.

When did the blower motor on my Blazer stop working?

2005 T’Blazer, 6 cylinder, manual A/C controls. Maybe 6 months ago, blower fan speed 5 stopped working, followed by the rest shortly after. Following the great advice on this forum, I checked the blower motor resistor and plug, and replaced as advised.

Why does my car blower motor not shut off?

If you have a vehicle with climate control system and a variable speed blower motor and the blower motor won’t shut off and stays on HIGH with the car turned off and the key out, chances are the blower motor motor control processor is toast or the HVAC control module is damaged.

How long does a Chevy blower motor stay on?

In very rare events, if the above symptoms are ignored, a fire could occur. This special coverage covers the condition described above for a period of 10 years or 240,000 km, whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership.

What causes a Chevy blower motor to overheat?

Either of the above may cause the relay resistor module or wiring connector to overheat, resulting in one or more of the following symptoms: In very rare events, if the above symptoms are ignored, a fire could occur.

When to apply for GMC blower motor coverage?

For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after April 8, 2011 are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to April 8, 2011 must be submitted to the Service Contract provider.

What to do if your Chevy blower motor relay blows out?

The blower motor relay on your Chevy vehicle is essential for the operation of the blower. If the relay is blown out, you will need to install a new one is soon as you can. Thankfully, it is fairly simple to tell if the relay is malfunctioning and to install a replacement.

How to test the blower motor resistor ( GM 4.3L )?

How To Test The Blower Control Switch (GM 4.3L, 5.0L, 5.7L). CASE 2: All 3 terminals had 12 Volts where indicated in the test steps. This is good and is the correct and expected test result that tells you that the blower fan switch (in the A/C-Heater control panel) is OK. Your next step is to bypass the blower resistor using a simple jumper wire.

Why does the blower speed Hi stop working?

‘HI’ is the only blower speed that doesn’t depend on the blower resistor to function. When the blower motor resistor fails, 1 of the 3 or all 3 first speeds stop working. To explain this a bit further, this is due to the nature of how a resistor reduces the voltage that passes thru’ it by converting some of it into heat.

How does the fan clutch on a Silverado work?

Righty tighty & lefty loosey. the fan is self tightening. so just look at the direction the fan is spinning when the engine is running, thats the direction you need to spin the nut to loosen it. The nut on my fan clutch has notches in it kind of like most left hand threaded nuts do. The new one I bought does not have those notches.

How do you remove fan clutch from water pump?

The nut on my fan clutch has notches in it kind of like most left hand threaded nuts do. The new one I bought does not have those notches. When I replaced my water pump way back when, I could have sworn it was left hand threads (I brought it to a shop then and they used an air chisel to remove it. I don’t have one of those lying around the house).

What to do if your Silverado water pump is going bad?

Once the system is pressurized, watch the gauge and observe if it is slowly dropping. If the pressure is dropping, then look at the hoses and radiator to see if any coolant is pouring out of these areas. If these areas are dry, inspect the water pump assembly. Coolant will escape out of the “weep hole” if the water pump is going bad.

Why do the cooling fans stay on when the engine is off?

Re: Electric Cooling fans staying ON when Engine is OFF. The powertrain control module (PCM) controls the low speed cooling fan operation by grounding the low speed fan relay control circuit with an internal solid state device called a driver.

What happens when a blower motor relay wears out?

Without it, the AC system will not be able to circulate any heated or cooled air. The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching. Over time, it can eventually wear out.

What causes a bad or failing blower motor relay?

Blown fuses. One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current…

Why does the blower motor stay on all the time?

So fired up the truck and the HVAC unit was working fine set the temp and the fan speed that all works fine, but turn the key off the blower motor should quit right?? No not with this one stays on till I pull the 40amp fuse.. ??? You are going to need to inspect the wiring connector at the resistor and blower motor.

Why does my GM front blower not shut off?