1991 Volkswagen Jetta Overheats

Tiny
MCM.
  • MEMBER
  • 1991 VOLKSWAGEN JETTA
Heater problem
1991 Volkswagen Jetta 6 cyl All Wheel Drive Automatic unknow miles

My car has overheated a couple times and is at the point where it might overheat again. When I see the the thermostat go up I crank up the heat causing the thermostat to back to normal.

I don't know much about cars but I know the thermostat has been changed.

Any ideas on what's wrong?

Thanks
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Wednesday, August 19th, 2009 AT 6:27 PM

6 Replies

Tiny
DR LOOT
  • EXPERT
Because you have overheated the vehicle the thermostat is now no good, what I would do is have the thermostat removed and drive it and see if it continues to overheat, since you have to replace it anyway. You may have a bad water pump or plugged radiator, but to start our diagnosis, lets start by removing the thermostat and see if the problem continues.
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Thursday, August 27th, 2009 AT 11:13 PM
Tiny
SWITCHCRAFT
  • MEMBER
I am having the same problem it keeps overheating.

I have removed the thermostat and it still overheats

what do I check next?
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Monday, November 16th, 2009 AT 3:40 PM
Tiny
DR LOOT
  • EXPERT
The only thing I can think of now is you have a blown head gasket, remove your spark plugs and let me know if any of them are wet.
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Monday, November 16th, 2009 AT 11:47 PM
Tiny
SWITCHCRAFT
  • MEMBER
Plugs are not wet, what do I check next?
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Tuesday, November 17th, 2009 AT 11:03 AM
Tiny
DR LOOT
  • EXPERT
OK, is the radiator fan coming on when it gets hot? If it is, you are going to have to go to your local parts store preferably Harbor freight, and purchase a infrared temperature gauge so you can check the temperature on the upper radiator hose and the lower radiator hose to make sure you are getting flow through the radiator, and let me know.
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Tuesday, November 17th, 2009 AT 10:25 PM
Tiny
TREES
  • MEMBER
How is the coolant level?

Before you do anything invasive, such as paying for a head gasket, try a full rad flush. Or just topping up the antifreeze or adding some water wetter.
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Tuesday, November 24th, 2009 AT 12:15 AM

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