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Thermostat

Tiny
NITRIDER73
  • MEMBER
  • 1990 FORD F-250
  • V8
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
I am working with a 1990 f250 I just replaced the thermostat, because I believed it to be getting stuck open, (low heat but full of fluid and gauge rose about a quarter of the way. I just put a new thermostat in and drove it about 60 miles, and it just now starts to heat up, so I replaced it with another thermostat and it heats up instantly, there is pressure in the radiator from the water pump, but it wont circulate im so confused.
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Tuesday, December 21st, 2010 AT 6:47 AM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the heater core and the heater control valve to include the air blend door-
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Tuesday, December 21st, 2010 AT 6:56 AM
Tiny
NITRIDER73
  • MEMBER
  • 2 POSTS
I noticed that the upper radiator hose is full of pressure and the radiator is cold to the touch could this be a bad water pump? I dont believe the water pump is bad because its not leaking, no funny noises, and its not locked up.
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Tuesday, December 21st, 2010 AT 7:26 AM

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