1996 GMC Jimmy no heat

Tiny
LDBJ123
  • 1996 GMC JIMMY

Heater problem
1996 GMC Jimmy 6 cyl Four Wheel Drive Automatic 60000 miles

I replaced the thermastat but I still don't have heat. Once in awhile I get luke warm heat for a little while. Any ideals?

Do you
have the same problem?
Yes
No
Monday, January 5th, 2009 AT 9:11 AM

3 Replies

Tiny
JDL
  • EXPERT
  • 16,281 POSTS

I guess your blower works good on all speeds? After everything is warmed up and the hvac controls turned on, can you feel of the heater hoses under the hood, are they both hot?

Was this
answer
helpful?
Yes
No
Monday, January 5th, 2009 AT 2:52 PM
Tiny
LDBJ123
  • MEMBER

Yes the blower works on all speeds. The bottom hose is hot but the top one isn't.

Was this
answer
helpful?
Yes
No
Monday, January 5th, 2009 AT 6:38 PM
Tiny
JDL
  • EXPERT
  • 16,281 POSTS

If you can feel air blowing out the vents, then you may need to flush your cooling system.

I did see a bulletin on this vehicle that uses dexcool. If the vehicle was driven a long time with low coolant level, it can cause a rust like substance to form in the coolant system, heater core included. Can you check for coolant flow through the heater core?

I just wanted to add, you might check the heater control valve where applicable.

Was this
answer
helpful?
Yes
No
Tuesday, January 6th, 2009 AT 8:51 AM

Please login or register to post a reply.

Other Heater No Heat Questions