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1991 Mercury Cougar Heater blowing cold, temp gauge raising

Tiny
JOSEPH80011
  • MEMBER
  • 1991 MERCURY COUGAR
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 98,000 MILES
I replaced eveything to do with the cooling system ie:radiator, thermostat, radiator cap, heater core, and got a flush and fill. My temp gauge is raising and lowering and my heater is blowing cold. My antifreeze is also boiling into the reservoir tank. Anything else I should look at?
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Saturday, January 12th, 2008 AT 9:57 PM

3 Replies

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
V6 3.8L
CHECK HEAD GASKET
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Saturday, January 12th, 2008 AT 10:08 PM
Tiny
JOSEPH80011
  • MEMBER
  • 2 POSTS
V6 3.8L
CHECK HEAD GASKET
[/quote:e28ff7a3f0]
Wouldnt you notice oil in the antifreeze or antifreeze in the oil? Wouldnt it have a miss to it when at idle or loose compression?
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Saturday, January 12th, 2008 AT 10:16 PM
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
V6 3.8L
CHECK HEAD GASKET
[/quote:e89e935005]
Wouldnt you notice oil in the antifreeze or antifreeze in the oil? Wouldnt it have a miss to it when at idle or loose compression?[/Quote:e89e935005]

no no nop
check head gasket
very very very common
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Saturday, January 12th, 2008 AT 10:57 PM

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