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1994 Ford Ranger Where is the coolant going?

Tiny
2ER79Z
  • MEMBER
  • 1994 FORD RANGER
  • 6 CYL
  • 2WD
  • MANUAL
  • 120,000 MILES
Have been looseing coolant and can't figure where it is going. Usually have to add 1 quart every 6 to 8 weeks. There are no signs of leakage even after the truck has cooled down. Had pressure test done on system and was ok. Recently it started makeing a hollow thud noise from behind the heater core area and the temp gauge will move to hot and then drop back down. It only does this every now and then. Also, I can hear fluid moveing through the hoses even after the truck is turned off. It sounds like water moveing through pipes. It runs fine. The oil looks ok and it is not smokeing. The heater also works. Very strange. Could this be a stuck thermostat?
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Sunday, April 13th, 2008 AT 9:58 PM

1 Reply

Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
With the temperture guage going up then down the thermastat could be the problem or a circulation problem. Check around the overfill bottle for the coolant and see if there is any fluid. With hearing the water when you shut the truck off does it sound like it is boiling inside the hoses. Try back flushing the system and replacing the thermastat.
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Monday, April 14th, 2008 AT 9:50 AM

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