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

2000 FORD RANGER
140,000 MILES • 3.0L • 4 CYL • 2WD • AUTOMATIC
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RONIWOOD
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  • 2 POSTS
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.
Oct 23, 2014 at 10:36 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 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?
Oct 23, 2014 at 10:45 AM
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RONIWOOD
  • MEMBER
  • 2 POSTS
Yes, it shoots out of the radiator once it warms up.
Oct 23, 2014 at 10:47 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 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.
Oct 23, 2014 at 10:51 AM
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