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Originally Posted by jlneis
I Have A 99 Jimmy Andthe Heat Only Blows Cold. Whenyou Are Driving And You Get The Engine Warm, If You Shut Off The Truck And Immediately Re Start It, It Will Blow Warm For A Minute Or Two Thru The Dash Vents Then Goes Back To Cold. Someone At The Dealer Told Me It Was The Climate Control Actuator. I Have Seen Many Postings For This, But I Would Like To Know If This Is The Problem, Does The Entire Dash Have To Be Pulled Out? Someone With The Same Problem Only On A Blazer Said You Can Take Out This Actuator Thru The Glove Box. The Radiator Was Flushed About 10000 Miles Ago But It Just Started Doing This Heat Thing. Help....
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Manual or auto heater controls?
First check is to see if the rad is full of coolant.
Is the engine getting up to normal 195-200 degrees?
Feel your heater hoses at the heater core.
Are both hot or cold or luke warm.
You could have a stopped up heater core.
If hoses are not hot at heater core.
Remove hoses and see if you can blow or run water threw the heater core.