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1990 Chevy Van Runninh hot and No hot air

Tiny
DJJERRY
  • MEMBER
  • 1990 CHEVROLET VAN
  • V8
  • 2WD
  • AUTOMATIC
  • 15,000 MILES
Would a bad thermostat not allow hot air to the heater core on a 1990 Chevy Van? I have back flushed everything and know there is water flow through the system. The heater switch is working, but the Thermostat appears to be openning at a much hotter level. But there is NO heat coming thru the vents. But the fan is working.
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Wednesday, January 21st, 2009 AT 12:51 PM

7 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
What temp t-stat did you use? Should be a 195. Are both heater hoses getting hot?If so, check under the dash for the blend door operation, may be stuck over to cold air
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Wednesday, January 21st, 2009 AT 4:36 PM
Tiny
DJJERRY
  • MEMBER
  • 4 POSTS
The thermostat is a brand new 195.
The both hoses or only mildly warm going into the heater core.
I will try to figure out how ot get into the dash as their is NO glove box. And look for the door.
THANX,
Jerry
djjrbear@hotmail. Com
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Wednesday, January 21st, 2009 AT 4:50 PM
Tiny
2CARPRO JACK
  • MECHANIC
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Are you sure water can flow though the heater core?
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Wednesday, January 21st, 2009 AT 5:32 PM
Tiny
DJJERRY
  • MEMBER
  • 4 POSTS
We tok both hoses off the heater core and flushed water thru. It went thru easily in both directions. The vacuum switch appears to be working, so I would believe that water is getting to the heater core when everything is hooked up. I have the line for the door. It is moving and I can hear the door in the heater core openning and closing. But have not taken the dash off. This is a solid one piece dash so was hoping to save that as a last resort. But it is looking more and more like the heatr core itself might be bad. I have not water leaks or at least none that are coming thru the dash to the floor or thru the vents that I can see at all.
THANX for everything. Any other ideas would be greatly appreciated.
Not sure where you guys are located? But if I can ever repay the favor. I have saved your websight and when I get paid I will make another donation. THANX,
Jerry H.
Www. Freewebs. Com/djjerry
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Wednesday, January 21st, 2009 AT 5:43 PM
Tiny
2CARPRO JACK
  • MECHANIC
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Is the van running at normal temp? I would be sure the heater control valve is working properly before ripping the dash out
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Wednesday, January 21st, 2009 AT 5:46 PM
Tiny
DJJERRY
  • MEMBER
  • 4 POSTS
The van is running at normal temp just as before. I did ut in a new Themrostat as according to the guage it was running just a little hot. I just dorve it about 15 miles and all was good. Just no heat.
Now what do you mean the heater control valve?
Is that the vacuum switch at the hoses? Or the control at the heater core?
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Wednesday, January 21st, 2009 AT 5:52 PM
Tiny
2CARPRO JACK
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It is the vacuum operated valve inline on the heater hose
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Wednesday, January 21st, 2009 AT 9:21 PM

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