Heater Problem
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Junior Member
Joined: Jan 2006
Posts: 14
Likes: 0
From: Tonawanda,NY
Car: 87 IROC
Engine: 5.7TPI
Heater Problem
AFTER READING ALL POSTS ON THIS SITE I HAVE NOT SEEN THE SAME THINGS THAT ARE LIKE MY HEATER PROBLEM.
I JUST REPLACED TSTAT AND I ALSO REPLACED HEATER CONTROL VALVE . AFTER RUNNING CAR TO TEMP ONLY TOP TWO HOSES ON HEATER VALVE ARE HOT AND NOT THE HOSE GOING INTO CORE. THE VACUUM LINE @ THE VALVE HAS ALOT OF SUCTION SO I DON'T BELIEVE THAT VACUUM IS A FACTOR. I ALSO HAVE ALOT OF HISSING UNDER DASH AND HISSING GOES AWAY WHILE ACCELERATING. WHAT TO CHECK?????1987 IROC 5.7 TPI
I JUST REPLACED TSTAT AND I ALSO REPLACED HEATER CONTROL VALVE . AFTER RUNNING CAR TO TEMP ONLY TOP TWO HOSES ON HEATER VALVE ARE HOT AND NOT THE HOSE GOING INTO CORE. THE VACUUM LINE @ THE VALVE HAS ALOT OF SUCTION SO I DON'T BELIEVE THAT VACUUM IS A FACTOR. I ALSO HAVE ALOT OF HISSING UNDER DASH AND HISSING GOES AWAY WHILE ACCELERATING. WHAT TO CHECK?????1987 IROC 5.7 TPI
TGO Supporter
Joined: Jul 2003
Posts: 4,803
Likes: 2
From: Grand Rapids, MI
Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
I would double check the way you have your hoses routed. Also sounds as if you have a vacuum leak at the controls behind the dash, either of which could cause your issue. Turn the AC to full max and check for vacuum at the hose end on the heater valve.
And for future reference: People generally don't like reading all caps.
And for future reference: People generally don't like reading all caps.
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