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2000 GMC Jimmy SLT

09-16-2009, 08:51 AM
I just noticed that when I run the heat after running this vehicle for quite some time no heat comes out of the vents. Any ideas on what could cause this and if so how can I fix it? I did check the two lines running out of the firewall and they both are hot to the touch. Any help would be greatly appreciated....

09-16-2009, 02:54 PM
Welcome to AF, will it get hot if the engine is speeded up? Any sign of sludge in the coolant or radiator?

09-16-2009, 08:35 PM
Time for a system flush, but be warned. I had similar issues and after flushing my system it took out the intake manifold gaskets, heater core and the rad. All very common issues on these trucks.

09-17-2009, 07:38 AM
A little quick on the system flush without more info, temp doors, and actuators may still be in the mix.

09-17-2009, 08:53 PM
i have a 2000 slt also and my problem was the heater core was clogged up

i had them back flush the heater core and then flushed the system

and to be honest i couldnt believe how much heat i have now

i had that done winter of 2008 and no problems with intake or anything else

just a idea good luck


09-17-2009, 09:10 PM
I don't mean to imply that a flush will definitely cause issues, I just know that it can and one should be prepared for it, especially with these trucks, lol.

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