Question about 1999 Mercury Sable

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What causes over heating that is not the water pump nor the head gasket after pressure testing?

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Couple of things....if your radiator is gunked up on the inside or the outside even from debris, that can cause poor flow/circulation and not cool enough for your motor. Also, the thermostat can stick and cause overheating. One last thing, the fans. If the fans aren't running you won't get proper cooling either....that's pretty much it!

Posted on Jun 28, 2009


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My car heats up in stop n go traffic. The temperature gauge can go as high as to the 'RED'. I adding water and coolant everyday. Are the fans supposed to come on as I am driving and the car heats up?

if you are adding coolant every day then you are experiencing coolant loss
could be from a leaking pump gasket , head gasket or other leaking item
have a compression test done to check for head gasket , cracked head
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If there is water in the oil, it wouldn't last long under the heat/pressure of the engine, so if you are seeing water it must be super fresh. Are you losing coolant? If so, then i'd suspect water pump/water pump gasket if you never had that replaced. It could be head gasket, but you would probably experience a consistent coolant loss with maybe loss of power or misfiring. You can check with a pressure/leak down test for head gasket. Either way, if you are losing coolant I'd check water pump. If you aren't losing coolant than it can't be the water pump or head gasket really letting "water" in.

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I have a mixture of oil and water coming out the exhaust

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Jun 07, 2012 | 1999 Cadillac Eldorado

1 Answer

The car is over heating even with new thermostat and rear ignition coil pack

Either, coolant temperature sensor, cooling fan relay,cooling fan ,radiator or water pump is defective . Worst case seniaro is you have a bad head gasket. I recommend you have the cooling system pressure tested to eliminate the head and leaks as being a cause.
Them have the tech check water pump and fan as well as their controls for defects.

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1 Answer

My Forester loses water from the cooling system. There are no leaks and pressure testing didn't show any loss of pressure. The engine is inclined to heat up when going up long hills.

one of 4 things can cause this. A thermostat that isnt opening all the way. A water pump that the blades (pump) is wearing out from corrosion, a restricted coolant system like maybe the radiator. A small head gasket leak. To rule out the head gasket as the issue have a smog machine sniff the coolant fumes for gasoline (hydro carbons), or have a shop do a chemical block test. Takes about five minutes for each test.

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Believe it or not, new thermostats can be bad. Did you maybe get some adhesive on the thermostat preventing it to open fully? Is the thermostat installed with the crown up? The only other thing that I can think of, if it's a closed cooling system and the wrong radiator cap is installed, it won't hold the pressure, therefor overheating. The other thing may be the water pump. Many times the impellers will wear down internally causing to low of water flow.

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Have the cooling system pressure tested. If it holds pressure, that's a good thing. If it doesn't hold pressure, you may have a leaking head gasket. What may be happening is the crack in the head gasket could be blowing hot air into the cooling system causing it to overheat.

Sep 27, 2008 | 1994 Jeep Wrangler

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