1984 Ranger Runs Hot After Thermostat

1984 ALL OTHER MAKES ALL OTHER MODELS
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TONES1628
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  • 3 POSTS
ranger was not building any temperature so I replaced temp sensor which did not help then I replaced the thermostat. now I am building temp but it runs all the way up to the high end of normal and never seems to open the thermostat.

Any help would be greatly appriciated.
Feb 2, 2006 at 7:43 AM
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CHEVY350GUY
  • ✓Experienced Mechanic
  • 109 POSTS
when you replaced the thermostate did you flush the system clean?
Feb 2, 2006 at 8:38 AM
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TONES1628
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  • 3 POSTS
yes the system was flushed
Feb 2, 2006 at 9:12 AM
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CHEVY350GUY
  • ✓Experienced Mechanic
  • 109 POSTS
it sounds like you have a faulty thermostat. it is probably worth it to put another one in because its temperature controlled, and if it is getting that hot, the thermostat has to be bad.
Feb 2, 2006 at 9:47 AM
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TONES1628
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was leaning that way just pulled it out and put it in an old pot with water and a digital thermometer and watch to see what temp it opened. temp was right 199 deg F which is what the manual called for.
Feb 2, 2006 at 9:57 AM
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CHEVY350GUY
  • ✓Experienced Mechanic
  • 109 POSTS
the only other thing i can think of is the water pump is worn out and not circulating properly. try this grab the pump pully and shake it . it should not move.
Feb 2, 2006 at 10:58 AM

Suggested Repair

Check the water pump for wear by grabbing the pump pulley and shaking it; it should not move. If there is play, the water pump is likely worn and not circulating coolant properly and should be replaced.

Conversation Summary

A 1984 Ranger 6-cylinder was not building temperature. Replacing the temperature sensor did not help. After the thermostat was replaced and the system flushed, the engine reached the high end of normal and the thermostat did not appear to open. A bench test showed the thermostat opening at the specified 199°F. The expert then suggested a worn water pump may not be circulating coolant and advised checking the pump pulley for movement.

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