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Coolent blows back into overflow reservoir and blows top of reservoir off

Tiny
RONIWOOD
  • MEMBER
  • 2000 FORD RANGER
  • 3.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
Changed water pump, thermostat, radiator hoses, sensors. Water backs up in the reservoir and blows the plastic lid off and antifreeze runs out. Water gauge does not show hot but goes up to normal.
Thursday, October 23rd, 2014 AT 5:36 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
I need you to test something. With the engine cold, remove the radiator cap and start the engine. Dose coolant shoot out of the radiator?
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Thursday, October 23rd, 2014 AT 5:45 PM
Tiny
RONIWOOD
  • MEMBER
  • 2 POSTS
Yes, it shoots out of the radiator once it warms up.
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Thursday, October 23rd, 2014 AT 5:47 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
If the coolant blows out of the radiator and the engine isn't overheating, most likely you have a bad head gasket allowing compressed air to enter the cooling system.
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Thursday, October 23rd, 2014 AT 5:51 PM

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