1997 Chevy Venture Car does not provide enough cabin heat

Tiny
ASHU9211
  • MEMBER
  • 1997 CHEVROLET VENTURE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 162,000 MILES
The van has gone through many recent repairs to fix this problem along with other symptoms, in the following order : - Changed thermostat > tuned vehincle > Changed water pump > changed thermostat > flushed radiator > flushed heater core > changed head gasket > replaced overflow hoses > performed coolant flush & replacement.

Still, the following symptoms exist :
- Temperature guage shows cold (1/3mark) on higher RPMs, and is in middle when idling
- engine & vehicle vibrate quite a bit on idle
- normal heat from heater when on idle but drops to luke warm at higher speeds/rpms.
- fuel efficiency has reduced from 20+ mpg to 17-18 mpg.
- no other warning lights/messages visible

During cold days my feet almost got a frostbite. Please advise. Thank you!
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Saturday, December 27th, 2008 AT 5:52 PM

4 Replies

Tiny
M_H_RITZEL
  • EXPERT
Have the vehicle scanned, Have a compression check done. What it sounds like to me is that something in the compression, or electrical problem, so it is not firing on all cylinders.
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Saturday, December 27th, 2008 AT 7:44 PM
Tiny
ASHU9211
  • MEMBER
Are you suggesting a engine compression or cooling system compression test? I had the latter done with no issues. Engine runs powerful and with no misfires (if it were not firing all cylinders I would get a check engine light but I don't see any such lights). It only vibrates when on idle. Anything else to consider before going ahead with the engine compression test and other repairs?
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Saturday, December 27th, 2008 AT 11:04 PM
Tiny
M_H_RITZEL
  • EXPERT
Try this, get some engine cleaner, the one you put in the gas, it will clean out the fuel line and injectors. That should help it run better. I re read your post to see if I missed anything. With the temp guage going up half way when ideling and going down to 1/3 when moving, my first guess would be try another thermastat. With it ideling the system does not cool off as much. Simular to overheating when sitting ideling in really hot weather. But when you move then the fluid will cool faster. A defective thermastat would produce the same symptons.
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Monday, December 29th, 2008 AT 6:13 PM
Tiny
AHUN
  • MEMBER
Try changing your cabin filters. I had the same issue, and I found out about these cabin filters, and so I changed them and what a difference
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Thursday, January 8th, 2009 AT 10:38 AM

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