I need help! My 94 seville sts overheats
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Joined: Feb 2007
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ok so fari have i have done everything and it all looks normal, but the water pump looks like its not flowing enough water so i put everything back the way it should be but broke a bolt off in the thermostat housing so im taking a break from the car for a day thanks again for all the help
water pumps have been known to be defective, even impellers installed backwards at the factory.
Although it is unusual, an improper water pump gasket installation or use of RTV/silicone at the water pump can and will restrict flow out of the pump. just cuz the pump is a dealer installation is no guarantee that it was done correctly.
also, a system blockage may be at play here.
if the headgasket had failed, and all else was OK, both the top and bottom hoses would be just as over heated. By your description of hot upper hose and colder bottom hose, I say this is not an issue.
engine seems to be overheating due to lack of coolant flow.
assuming all your descriptions in the thread are correct, I would be doing a reverse flush, and removing and inspecting the pump. Once the stat is removed and radiator is verified not blocked, there should be nothing to prevent or restrict flow. It is a simple system that simply moves coolant from engine to radiator and back.
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Last edited by Stealth; May 16, 2009 at 08:45 AM.
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Joined: May 2009
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Ok I have flushed the system and have found the heater core is definatly blocked, with the core bypassed top and bottom hose get hot.The car still overheats, there is no leak and i cant see water in the oil,it overheats faster if its driving.With the top hose off water flows out, does it sound like a headgasket, the temp climbs very quick.
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With a garden hose in the top hose water flows out the bottom hose. If the stat is out it seems to get hot quicker but could just be me.Should the water in the fill tank be pulsating up and down once the stat opens and when it does this it flows out of the tank. how can i tell if the impellers are installed wrong
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Joined: Jun 2007
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With a garden hose in the top hose water flows out the bottom hose. If the stat is out it seems to get hot quicker but could just be me.Should the water in the fill tank be pulsating up and down once the stat opens and when it does this it flows out of the tank. how can i tell if the impellers are installed wrong
2nd item .. job of stat is to stop coolant from going to radiator if engine coolant is too cold. W/O it, warm coolant goes straight to the radiator.
3rd item .. compare to a known good pump or go to a different supplier and ask to see one of their pumps .. different supplier should be a different batch.
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