Question about 1998 GMC Jimmy

2 Answers

Heater temp control not working

Blows heat all the time no matter where i set temp control,also a/c isnt working

Posted by on

  • 3 more comments 
  • Anonymous Dec 19, 2008

    my heater vent all ways say on the upper front vents even when adjust it i need help 98 jimmy.

  • Anonymous Feb 26, 2009

    blows hot air all the time does not cool when i lower temp

  • brasshorse53 Mar 05, 2009

    i have same problem with my 1998 gmc jimmy will cook you out of the vehicle. don't know how to fix.

  • pimpbones01 Mar 17, 2009

    I even replaced the heater core a year ago. Then as soon as winter came around I found out that some mechanic had bypassed the heater core since it's replacement and no one told me anything. Had they let me know at the time it would've been warrantied service. I still have no heat. Thank goodness it's about to be warm again.

  • Anonymous May 03, 2009

    Blows hot air all the time,1998 Jimmy SLT, is this something to do with the cliamte controls?

×

2 Answers

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 1 Answer

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!

Posted on Sep 10, 2009

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that hasĀ over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 5 Answers

Check the heater core its pronby bad

Posted on Dec 13, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How do I reset the computer so that the heater controls will work properly


Try disconnecting either the hvac control head for a few seconds or even the battery for 1-2 min.. If no change you probably have a faulty passenger side temp actuator.. Sounds like you have a dual zone setup, as in the driver and passenger can have there own temp settings.. There is a actuator for each side..

May 02, 2016 | 2012 Dodge Grand Caravan

1 Answer

The heater blows cold air when temp setting is high. If I turn off the heater a few time is will blow hot


vaccuum leak in heater panel,if it isnt,it could be the control unit or (head) get a used one at a junk yard

Apr 13, 2015 | 2004 Chevrolet Avalanche

1 Answer

Control panel


Year make and model ? I doubt the heater ac control would affect the engine temp gauge.

Jul 04, 2013 | Cars & Trucks

1 Answer

98 Ford Taurus Heat blows Full no matter how hot it is in the car and even though the Temp is turned down to 60. Also A/C does not work Blows Heat instead not just warm air actual heat. Can turn down fan...


The heater door is probably stuck in the full heat position. It could be a problem with the heater door motor or the controller - you'd have to check for both mechanical and electrical problems under the dashboard.

Feb 21, 2011 | 1999 Ford Taurus

1 Answer

Fully warmed up; blowing hot and cold; Suzuki XL-7


Its just a vent damper plate not operating, it's like a gate which controls the flow of air,,usually they are operated by vacuum, or cables.
Service center time, unless you are handy with your own repairs.

Jan 19, 2009 | 2004 Suzuki Verona

2 Answers

Heater blows out cold air half the time


the heater doesn,t work blows cold air

Nov 20, 2008 | 2001 Ford Taurus

3 Answers

BLOWS HOT AIR ALL THE TIME,AC WORKING,TURN TEMP CONTROL ANY POSTION SAME TEMP


I've had 2 Astros. A 1993 and a 1994, and had a problem with the heat/AC on both of them. They blew only air through the defroster no matter where I set the control, heater, A/C, floor or vent.

Both times the problem was with the VACUUM hoses in the engine compartment. The hoses had become dry, brittle and then cracked. The hoses are black tubes about the size of a drinking straw, and about 12" to 14" in length. Look for hoses that are hanging loose, they usually break off from junctions where 2 or 3 lines come together.

Aug 07, 2008 | 1994 Chevrolet Astro

Not finding what you are looking for?
1998 GMC Jimmy Logo

769 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

60769 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...