Question about 1998 GMC Jimmy

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Heat problems My 1998 GMC Jimmy doesn't provide heat for the foot setting. When on the foot/face setting it blows heat on the face but not on the feet

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  • red911pj Jan 28, 2009

    Thank you! I will check and see if I can find the kit. May I ask if you know how much something like that runs? And is it something I can replace myself?

  • red911pj Jan 28, 2009

    It works in all other modes except for the foot setting

  • rollin1320 May 11, 2010

    where is blend actuator located

  • mnabi01
    mnabi01 May 11, 2010

    dose it work in any other mode exp defrost ??



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If it wors in other modes the problem is not the switch you may have a blend door actuator problem . check to see if you get the signal from seitch to o.k. replace blend actuator.

Posted on Jan 28, 2009

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Do you here a vacuum leak around the blend door switch were the fan switch is if so replace for sure.this assembly comes as a unit a very common problem .the dealer will have it in stock . hope this has helped

Posted on Jan 28, 2009


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My a/c heat control knob does not function properly when changing from defrost to face/foot, face only, or foot only. it always blows out of defrost and face. Also, I have had to replace my blower motor 4...

Switch housing failure. Most likely a simple, broken part in the switch housing. At one point you had the defrost/face in the on position and when you switched it to face / feet, is when this little piece broke off. So now (internally) it cannot be switched from on to the other. Also may have shorted and/or begun to melt a bit. Providing that I am correct, the part can be as inexpensive as $17. Buy a Chilton or Haynes manual. Not too difficult. Good Luck!

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'98 jimmy blows heat only, whirring noise behind glove box when problem started

That is your blend door actuator replace it and your air will work just repaced mine the other day.

Mar 30, 2010 | 1998 GMC Jimmy

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Where is the heater valve located on a 1998 GMC jimmy

There is no heater valve in that rig.The heat is controlled by the gates in the heater box as you adjust the temp setting from your controls.If you are having a heat problem check the gates operation for movment as you go from hot to cold.You may have to remove the glove box to do this along with the help of a friend if you need to look under the dash on the passenger side.

Feb 13, 2010 | 1998 GMC Jimmy

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98 Jimmy throws out heat but won't switch to all vent options

Your going to have to replace the switch. The switch it self may have gone bad, since it works on a vacuum. It's common for the diaphragm in the switch assembly to go bad, if it's not the switch. Then it's going to be a bad actuator door and will need to be freed up. I have found it to be the switch it self get dirty and the vacuum needed to activate the actuator door is not there.

Good luck and keep me posted. When you turn the switch from defrost to heater, do you hear a air leak??? If you do then it's a good chance that it's the switch it self.

Dec 03, 2009 | 1998 GMC Jimmy

1 Answer

I have a 1998 GMC jimmy heating problem. it blows out cold air we fixed the thermostat and the dile. what could be the prob

If everything else is working properly, then there might be air in the system. Bleed the air out via the heater hose at operating temp.

Dec 01, 2009 | 1998 GMC Jimmy

2 Answers

Heater temp control not working

We had the same problem in our 98 GMC Jimmy. Was blowing hot air everywher with everything shut off & air conditioning would not work. We found out it was the Blend Dood Actuator, it is located behind the glovebox. We purchased one on EBay & replaced it and are back on track again. Good luck!

Dec 13, 2008 | 1998 GMC Jimmy

3 Answers

2000 GMC Heater Problem

I had problems with a similar truck,a 1998 GMC diesel after checking to make sure the control cables were operating the blend door and blowing the mess of the heater core,I replace the thermostats.Still no heat turns out there was a small amount of debris collecting in the fitting for the inlet hose at the thermostat housing after removing it and blowing out the lines the heat was fine.

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No air, ac, heat out of in dash face vent

check the hoses connected to the vacuum advance ball, it has probably begun to decompose...

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Heat won't shut off in my 1998 Jimmy

I would suspect your blend air door is in the full open position, which is the default position if any of your hvac sensors report a problem. This could be a sensor problem, a module problem, a mechanical problem, or an unrelated trouble code stored in the body control module. Best to have an Auto tech take a look at it.

Aug 03, 2008 | 1998 GMC Jimmy

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