Question about 1998 Mercury Mystique

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The car overheats water is not circulating I suspect the water pump or thermostat because the radiator stays cold while the water in one hose boils the other hose cold

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Change the thermostat. be sure to put it in facing the correct direction ;-)

Posted on Sep 08, 2010

Testimonial: "I thank you so much for your time and patience and for providing me with the resource I needed to try and resolve the cooling system problem. "

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  • adalib Sep 09, 2010

    Thanks , we took the water pump off and it was bad so replaced it with new unit new belt new coolant. The water is now circulating but not into the radiator and the gauge shows it over heating we could not find any thermostat , where would it be located ? the fans kick in but don't stop the air out of the heater is not warming up so I think the radiator is plugged . If the thermostat was bad the fans would not turn on I think.

  • cheap repair Sep 09, 2010

    http://www.2carpros.com/forum/1998-ford-...

  • adalib Sep 09, 2010

    I thank you so much for your time and patience and for providing me with the resource I needed to try and resolve the cooling system problem.I shall keep you posted with the result tomorrow we will see if the part can be found since at the moment I am in Mexico City (explains the ******** mechanics) and parts for that car are hard to get here we lucked out they had the water pump in stock ! Thank you again so much that sounds easier than removing the radiator only to find it is not the problem. That design of engine was not meant to be fixed hahaha the alternator is so far from reach the suspension and anything in the way had to be removed to replace it !
    =]

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Water doesn't seem to be running around the system and is getting overheated. From the water bottle the hose to the engine is cold but the hose from the engine is hot as tho there is an airlock. is this...


there are a few possibilities .. first a bad thermostat is likely if the hose attached there isnt getting hot ... if the thermostat has been changed recently then make sure its in the correct way .. the spring or thermal sensor goes toward the engine .. the flipper valve goes toward the radiator .. make sure its not blocked by the gasket .. another possibility is a bad water pump .. an internally collapsed radiator hose is also possible ... make sure the cooling fan is turning on and actually moving air when the radiator gets hot ... you dont need the fan while moving but while idling the radiator will overheat if its not working .. you also have to check the pressure cap .. if it doesn't built pressure then the coolant or water will boil before the fan turns on .. when the engine is hot the radiator hoses should be hard from the pressure .. ... your problem sounds most likely a bad thermostat ..

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I HAVE A 2000 ALERO.. MY HEATER IS NOT WORKING AND MY CAR IS OVER HEATING.. WHEN MY CAR IS COLD AND I FILL IT WITH WATER, WITH THE CAP OFF, I THEN TURN MY CAR ON AND THE WATER DOES NOT PUMP UP AND THEN I...


Hi there camcam,

Ok, first off the cooling system has to be full and circulating for the heater to work. When we get the rest of it solved, the heater will take care of itself.

Now the overheat problem. We need to determine if the engine is overheating because of lack of coolant or the lack of coolant is because of the overheating (Boiling off).

If you have to put in any significant amount of water on a regular basis, it has to be going somewhere. If there is a pool of coolant forming under the car, there's a leak. You need to locate it and act according to where you find it.

  • Radiator - weld or replace
  • Hoses - replace
  • Water pump - replace (check fan if attached, for balance)
The thermostat is a temperature triggered valve that periodically routes coolant circulation through the radiator. This allows hot water from the engine to be exchanged with cool water from the radiator.

A malfunctioning thermostat doesn't allow the heat exchange process, the engine overheats, coolant turns to steam....

Although rarer, the same result occurs if the water pump does not circulate coolant. When a water pump fails, it's usually leaking through a shaft seal.

So, if you don't find a leak, the thermostat is the first (and least expensive) thing to address.

I hope you find this to be instrumental in solving your problem.

Best regards
Mike


Apr 06, 2010 | 1999 Oldsmobile Alero

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