Question about 2005 Chevrolet Tahoe

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The heater/air conditioning fan won't come on when engine is on but runs with no control when ignition is off

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  • Chevrolet Master
  • 6,826 Answers

Relay problem, or reverse wiring or bad logic in body control module.

Posted on Jul 08, 2010

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My 2010 dodge journey is running hot and the heater is blowing cold air. Temp goes back down to normal while driving. No indicator lights r on. Is it the thermostat or heater core?


Most likely neither is the problem, to verify the heater core is ok go under the hood and touch the heater core coolant supply hoses (hot engine) one will be really hot and one a little cooler, if this is the case the heater core is ok and you have another problem, that other problem is most likely a failed part or parts called the air temperature control blend door motor or door is defective. Also I doubt the engine is overheating, it gets hotter while sitting in traffic because the electric fan that cools the engine only comes on at about 225 degrees Fahrenheit. If you had an overheat condition the check engine light would also come on to alert you of the overheating condition.

Dec 05, 2016 | Dodge Cars & Trucks

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Why my A/C condenser fan won t stop running, dodge ram 2008


To clarify, the compressor and fan will run in defrost mode. The compressor and fan runs to dry out the air blowing onto the windshield.
Now if the condenser fan runs in "heat" you may have a problem with the fan relay or the main controller.

Sep 25, 2014 | 2008 Dodge Ram Pickup 1500

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Heater not working in extreme cold weather because fan wont shut off. fan has been replace and the computer has been checked. nobody knows what is wrong


I'm making some assumptions, here.. I've been told I make too many assumptions... but, I'm assuming that you're talking about the engine cooling fan.. If I'm correct in this assumption, my guess is that you've not taken the vehicle to a good, reputable mechanic or repair shop. There are several reasons that an engine fan would not turn off, and each reason would have to come from a qualified mechanic. For example, there is a sending unit for the air conditioning system that might cause continuous running... or a sending unit in the air conditioning system that could cause the same thing. To complicate that issue, quite likely your air conditioning system purposely kicks on the engine fan any time you run your defroster. Also, your inside heater should function correctly, regardless of the engine fan running continuously. If I'm wrong on that score, then your engine has a thermostat problem "to boot"... which, by itself, could cause poor heating of the inside of the vehicle. NOW, backing up a little, if you so happen to be talking about the fan INSIDE the vehicle that is part of your heating OR air conditioning, we have a little different matter on our hands... First, some vehicles legitimately have a fan running on slow speed at ALL times.. for continuous air circulation purposes (sometimes, you can't actually hear this). Also, I might add that THIS fan running all the time should not be a problem for the heater to work properly.

Jan 03, 2014 | Cars & Trucks

1 Answer

Cooling fan runs all time


If you mean all the time when the ignition is on, this may be correct, depending on how you have the climate controls set. Anytime you have the climate control in an A/C mode, or whenever the defroster is on (look for the squiggly lines icon on the control), the A/C compressor runs and thus so will the cooling fan. To be sure, place the climate control in the heat mode with the air directed to the floor vents, As long as the engine is at normal temp, then cooling fan should be off in this condition.

Nov 30, 2013 | Chevrolet Cavalier Cars & Trucks

2 Answers

No heat or air conditioning on my 2004 grand prix


Is your fan working? Did you check the HVAC fuse? In the summer is the Air Conditioning clutch even turning on? Please rate my answer so I get my points for it.

Jan 20, 2012 | 2004 Pontiac Grand Prix

1 Answer

Needto replace heater core in 99 ford taurus,need help


Instructions Things You'll Need:
  • Replacement heater core
  • Clean container
  • Wrench
  • Screwdriver
  • Steering wheel nut
    Removal
  1. Disconnect the negative battery cable and wait at least one minute for the air bag system to lose power. Make sure the front wheels are straight ahead and lock the steering column.

  2. Detach the air bag module by removing the bolts from underneath both sides of the steering wheel and the electrical connector. Remove the steering wheel bolt and press the wheel away from the steering column. Remove the lower steering column cover.

  3. Insert a 1/8-inch wire or pin punch in the shroud hole under the ignition switch while it's in the "Run" position. Press on the pin and pull on the ignition switch lock cylinder to remove it.

  4. Disassemble and remove the instrument panel from the Taurus' interior. This includes the radio and all panels, electrical connectors, harnesses and screws. You'll need an assistant to help you lift and remove the instrument panel.

  5. Drain the engine coolant from the cooling system, using a clean container for reuse. Remove the heater hoses, actuator and metal cover from the heater. Disengage the spring from the heater core cover and the lever.

  6. Depress the locking ramp and remove the lever from the secondary air temperature control (the lever is brittle, so don't bend it). Remove the primary air conditioning air temperature control door shaft from the pin.

  7. Remove the heater core cover and seal from the heater/air conditioning housing assembly. Remove the heater core from the heater/air conditioning housing by pressing on the core tubes and assembly.

  8. Installation
  9. Install the replacement heater core to the heater/air conditioning housing. Install the core cover, seal, lever, spring, metal cover, actuator and heater hoses.

  10. Replace and assemble the instrument panel with your assistant's help. Connect the steering wheel (use a new bolt to connect it to the column), air bag and negative battery cable.

  11. Refill the cooling system with either the old coolant or new. Start the Taurus' engine and let it reach normal operating temperature. Watch the climate control operation and check for any leaks.



Read more: How to Replace the Heater Core in a Ford Taurus ' eHow.com http://www.ehow.com/how_4521301_replace-heater-core-ford-taurus.html#ixzz132BljfG8

Oct 21, 2010 | Ford Taurus Cars & Trucks

1 Answer

Where is the air conditioner blower fan relay on 1996 Jeep Grand Cherokee located?


The blower fan relay is located in the fuse box on the driver's side fender-well. A Jeep Cherokee uses an electric fan as an auxiliary fan for engine cooling and for cooling the air conditioning condenser when the air conditioning is in operation. A radiator temperature-sensing switch that activates the fan relay at 198 degrees F turns the fan on and controls its operation. The temperature drops when the vehicle is in motion and the switch turns the fan off. When the air conditioning system is in operation, the air conditioning relay supplies power to the fan relay via a fan diode downstream from the ignition switch. This diode activates the fan relay and keeps the fan operating as long as the air conditioning is on. Thanks. you can rate this solution and show your appreciation.

May 18, 2010 | Cars & Trucks

2 Answers

Heater fan wont shut off when ignition is turned off.


Should have a blower control unit. Sometinmes these are known to leave the blower running on low speed with the key off.

Oct 13, 2009 | 2003 GMC Envoy

1 Answer

Heater fan runs while ignitions is turned off pulled fuse but the fan can still run but only intermitly


Heater or radiator? The radiator fan is running to cool the coolant down (since the engine isn't running, no air moves through the radiator) and extend your engine life. It's what it's supposed to do. Don't worry.

Regards,
matt

Sep 15, 2009 | 2006 GMC Sierra

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