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Backpressure in cooling system?

Tiny
KOJACK150
  • MEMBER
  • 1995 MERCURY SABLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 172,000 MILES
Im trying to get my heater core working again in a 1995 mercury sable, but the temp gauge sometimes stays cold for over 10-20 mins or skyrockets to boiling hot, and when I squeeze the upper radiator hose, it feels stiff like the coolant is just sitting there; not circulating at all. Could the water pump be defective and backpressure build up?
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Monday, December 20th, 2010 AT 2:07 AM

3 Replies

Tiny
BOATBUDDY
  • MEMBER
  • 29 POSTS
Try a preassure test
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Monday, December 20th, 2010 AT 3:03 AM
Tiny
BOATBUDDY
  • MEMBER
  • 29 POSTS
The upper inlet hose should be hot if the car has been driven, if not then the thermostat isn't opening and needs to be replaced
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Monday, December 20th, 2010 AT 3:10 AM
Tiny
KOJACK150
  • MEMBER
  • 4 POSTS
The upper hose does get hot, and I tested the old thermostat in a pot of boiling water; still works but I installed a new one anyway

how can I test the water pump?
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Monday, December 20th, 2010 AT 2:24 PM

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