Question about 1998 GMC Jimmy

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Where is temp door actuator located and what is easiest way to get to it

Where is temp door actuator located om 98 gmc jimmy and how do i get to it to replace it?

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Behind the glove box only two screws. You will have to move the vacuum and it is right there.

Posted on Jun 15, 2010

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1 Answer

98 jimmy 4x4 stopped working


There is also an actuator on the front axle.

Feb 10, 2014 | 1998 GMC Jimmy

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I have a 98 GMC Jimmy. I have the part to replace the heater actuator door. The problems is I cant get the oval shaped hole to slide onto the shaft.


If you plug the new part in. Turn your heat or defrost selector on with the key on engine off. This will able the actuator to move and line your hole up to your rod. Once its aligned slide it on and bolt it into place.

Jun 28, 2011 | GMC Jimmy Cars & Trucks

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1998 Jimmy with electrical controls for temperature. Replaced Themostat, Flushed heater core, replaced damaged vacuum lines. Vehicle produces heat to heater core but only luke warm interior temp. Rotated...


Suggestion: see if the blend door opens or closes completely to allow all air through the heater core. To see the blend door moving, remove the panel that says "Cut here for service" under the hood along the firewall. I have a 99 Bravada where the blend door keeps moving back and forth constantly. Changed the blend door actuator but still keeps moving. The air inside is only warm since the door keeps allowing bypassed air through.

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Jul 17, 2010 | 1997 GMC Jimmy

1 Answer

'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

1 Answer

No heat in 98 jimmy. Replaced water pump,


Possibly.. the actuators which operate the doors actually have a position signal for reference, but the actual motors inside the actuators dont realize there is a limit and overshoot their limits causing the fine wires inside to rip apart rendering the actuator scrap but this happens when actuators are still plugged in to the connector while being taken off the heater door, and they can and will still move with the key in the off position if the actuator thinks it not in the proper position..thats how they work anyway.hope you had them unplugged untill the last, then this would'nt happen....hope this explaination helped

Dec 06, 2009 | 1998 GMC Jimmy

2 Answers

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

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I have the Heater/blend door to replace the old one in my 98 gmc jimmy. I cant get the part to slide on the shaft. Any ideas?

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2 Answers

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replace the actuater 59.00 at auto zone

Mar 06, 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

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