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What needs to be checked?

Tiny
CRYMIST
  • MEMBER
  • 1999 MERCURY SABLE
  • 189,000 MILES
Ok I have a 1999 mercury sable v6 3.0L ac works heater dosn't heat but my problem is that my coolant flows out my reservoir not all the time just sometimes I can make short trips it will be ok then sometimes it flows out from under reservoir cap. The cap has been replaced, thermostat has been replaced twice, car has been flushed twiced; combustin leak test has been done chemial stayed blue. Also have taken heater hose off started car fluid was flowing. Other than raditor what do I need to check
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Saturday, June 9th, 2012 AT 1:50 PM

11 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
So do both the heater hoses get really hot?Also does the radiator fan work correctly?
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Saturday, June 9th, 2012 AT 2:38 PM
Tiny
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Yes the fans are working correctly, as far as both hoses I know that the top is holding pressure and it does feel hot the bottom is also holding pressure.
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Saturday, June 9th, 2012 AT 5:00 PM
Tiny
SATURNTECH9
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So are both heater hoses getting really hot?Are both upper and lower radiator hoses getting really hot?Hows your radiator cap?
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Sunday, June 10th, 2012 AT 4:04 AM
Tiny
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Both heater hoses and radiator hoses are hot after car is running. As far as the cap, it still is having the back flow to leak out from under it. Also want to say thank you for helping.
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Sunday, June 10th, 2012 AT 12:14 PM
Tiny
DJCL
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  • 767 POSTS
What is the engine temp when this happens?
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Sunday, June 10th, 2012 AT 12:21 PM
Tiny
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I really don't know the temp, can say that it is not long after you have had the car running when you shut the car off you can hear the coolant gurgling in reservoir that is when it overflows under cap when touching hoses they are hot.
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Sunday, June 10th, 2012 AT 12:54 PM
Tiny
DJCL
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Are the fans running when the coolant is backing up?
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Sunday, June 10th, 2012 AT 1:20 PM
Tiny
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Yes the fans are running. Thank you for trying to help
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Sunday, June 10th, 2012 AT 1:23 PM
Tiny
SATURNTECH9
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How high does the temp gauge show when the coolant is overflowing?Higher then it normaly runs?Also to properly diagnose a coolant temp issue I would invest in a infared temp gun. They have gotten pretty cheap and will tell us what temp the fans come one and the over flow happens. Also can use it for many other things and future issues.
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Sunday, June 10th, 2012 AT 3:53 PM
Tiny
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The temp gauge shows it to be running normal it only moves towards high end when coolant is getting low or gauge moves when it is gushing from resevior
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Sunday, June 10th, 2012 AT 4:02 PM
Tiny
SATURNTECH9
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We need to know what temp the fans are coming on it could be too high causing the overflowing. Like I said I would get a infared temp gun. Thats the first I grab beside my scan tool when I have a car overheating.
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Sunday, June 10th, 2012 AT 4:17 PM

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