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1999 Ford Ranger temperature fluctuating

Tiny
MHUFF
  • MEMBER
  • 1999 FORD RANGER
  • 6 CYL
  • 4WD
  • MANUAL
  • 122,000 MILES
I noticed the temp gauge flucuating from low to mid while driving once the engine is warm. Never goes above mid so I dont think it's overheating but it's winter and the outside temps have been cool. Coolent level seems normal. Heater seems to operate normally.
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Monday, January 14th, 2008 AT 12:33 PM

2 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Check the coolant level, and may have some trapped air, with cold engine, remove the radiator cap, start truck, squeeze upper radiator hose a few time, fill to capacity, reinstall cap! Other possibilty is sending unit weak, or gauge!
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Monday, January 14th, 2008 AT 12:42 PM
Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
Check the wire by the sending unit, to see if it is touching a bare spot. If it is ok then the problem seems to be in the thermastat, where it is binding up a little and need to be replaced.
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Monday, January 14th, 2008 AT 12:42 PM

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