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It only happens when I turn the truck off it boilis back in to overflow jug

Tiny
INDIANLAND14
  • MEMBER
  • 1999 FORD RANGER
  • 124,789 MILES
I have a 99 ford ranger 3.0 flex fuel the coolant keeps boiling back into the overflow jug it has a new thermostat new rad cap. Water pump seems to be working fine its cooling off and all it just boils back bad when u turn the truck off
Monday, January 2nd, 2012 AT 4:06 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,879 POSTS
Coolant flow has stopped but the engine is still hot and giving up its heat to that coolant. If you are not losing coolant, there likely is no problem. If the bubbling is excessive, read the coolant temperature on a scanner that can display live data. If the engine is running considerably over 195 degrees, check the radiator for blockage between the cooling fins, and whether those fins are rotten and crumble easily.
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Monday, January 2nd, 2012 AT 4:21 AM

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