Question about 2001 GMC Jimmy

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NO HEAT fan blows great, a/c works great, only cool air comes out when heater is on, will not heat up at all. No smells, just clean cool air. tried recycled air sna outside air same results. PLEASE HELP, THANKS, Les

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  • brink_182_ Oct 02, 2008

    a/c works great, only cool air comes out when heater is on, will not heat up at all. , how much does this blend actuator run?

  • Anonymous Oct 06, 2008

    Hi all I have the same problem 2000 jimmy flushed rad twice replaced a bunch of parts except the accuator its gotta be blows warm on lowest fan option then nothing but luke warm air if you turn up the fan

  • leroyvanek Oct 29, 2008

    my 2001 Jimmy does the same thing, warm heat if blower is on low, barely luke warm heat if its on high.....help please

  • djo2355 Jan 17, 2009

    What does it cost to replace the actuator?

  • AVmom Jan 28, 2009

    The heat in my Jimmy stopped working a few months ago out of the blue. Literally worked one morning and not the next. Blows out only cold air whether on low or high. I haven't taken it in yet for a diagnosis because I haven't really needed the heat (live in AZ).

  • djones1320 Feb 09, 2009

    I have the same problem. I pulled apart my whole dash and replaced the heater core and still no heat! I am convinced that it is the actuator. I have fixed everything else. I have had nothing but problems with this car and ready to give in the towel..!!!!

  • Anonymous Mar 25, 2014

    Just got through the winter with No Heat in a 2008 grand marquis. Both the heat and A/c died at the same exact time and the cigarette fuse was the only thing I found that was blown of the fuses I can check. A/c when on seems warmer then the heater supposed to be. at start of the heat you can fell Hot air for a sec and then it goes cool. any ideals?

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Your heater core is pluged

Posted on Jan 29, 2009


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Take heater hoses off and flush heater core these vehicles are known for this problem might have to do this every year

Posted on Nov 01, 2008

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Flush the radiator/heater core. I had the same problem, flushed it two weeks ago, and now i have heat like ive had in all my previous vehicles. Couldn't believe it took me a year to narrow down what i hadnt done, did it, and i cant stop the hot air now its awesome on cool mornings of late

Posted on Oct 05, 2008

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  • 29 Answers

Les, it sounds like your blend door actuator has failed, it is a small vacuum operated diaphram up under the dash that controls a flapper that switches between the cool air and heated air. Good news is that it is an inexpensive part, bad news is pulling the dash out to get to it.

Posted on Oct 02, 2008

  • Dartonpro Oct 03, 2008

    if the blend actuator is not working, (or I didnt mention, if there is a vacuum leak going to the actuator) it will act just like you never move your temp switch off cold.

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Not if the engine is getting up to normal temp. Could be low on coolant or a problem with the heater core or a blend door under the dash.

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I'm looking for the fuse that goes to me heater. the fan comes on but it blows cold air.


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the fan priveds air circulation, not heat. If you have power to the fan, you're good in the fuse department.
As for no heat - did you check the coolant level?
Any check engine lights on?
Have you added anything to the radiator to prevent leakage? (If so the heater core could be clogged or other obstruction in the supply lines to/ from the engine cooling system.)
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1 Answer

Air works great but no heat just blows cold air


For this types of problem,i suggest you to check this help links:----Car heater blowing warm, but not hot air?http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html
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2 Answers

Heat blows cold air-no heat


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2 Answers

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3 Answers

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The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow.

If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm.

If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air.

If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted.

One or a combination of these factors is likely the culprit in your case.

Flush the heater core 2-3 times, and if the obstruction does not clear, a new heater core is required.

However in your case, a cracked head is suspected - this will give out a plume of white smoke on startup - There is no smell, carpet dampness, or abundant moisture in the cabin? (this warns of a leaking heater core)

The coolant is leaking through a gasket or crack, and entering the combustion chamber. You dont see a leak on the ground because it is being burned up with the fuel.

Good Luck, and thanks for using FixYa - A FixYa rating is appreciated!!

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