Question about 2002 Nissan Altima

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Running hot water pump was leaking (i noticed because fan didn't kick off when car was turned off so we checked water level). we replaced water pump and belts and car runs hot...so we replaced the thermostat, then radiator cap, then flushed the system (thought an air pocket could be problem) but car still runs hot! top radiator hose gets hot bottom one does not. we also ran it without a thermostat and still ran hot! help

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  • jjohnson5353 Dec 01, 2008

    i will check on this, but the fans do kick on.

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Radiator Fan Control Relay Switch. I bet your electric fan doesn't run?

Posted on Dec 01, 2008

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Cooling Fan running


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Ideas? Yes, I think the problem is the water pump. Don't drive it overheated till you get a new water pump or have it inspected. You say it's a small leak where it bolts to block, but maybe it's the "weep hole" on bottom of pump leaking, meaning the internal seals on the pump have failed. If so, it won't be a small leak, it will leak all the time engine is running. A lot may be swept away by air, or by evaporating. Check it out. That's a likely cause of overheating.

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What make a car run hot


Thanks for choosing FixYa and welcome. If you are low on coolant fluid, it will cause it to overheat. Check your coolant fluid level. If your fans are not working or kicking on, it will cause overheating. If so, check the fuse for them. Check for leaking coolant on your lines. A bad radiator can cause overheating and a bad cap can cause overheating. Make sure the cap is snug. Make sure there are no leaks. Now, the most common issue would be a bad thermostat or a sticking thermostat. Next, I would say would be a bad water pump. Now, it could be the water pump valve or impeller, but that is not common. Also, a bad head gasket can cause overheating. Anyone of these can cause your issue. Check fluid first and fans. You may have a leak or a bad fuse. If the fans do not work, that is probably your problem. They should kick on when the car begins to heat up. If the fuse is good and they still don't work, it is either the wiring or the fan itself. I hope this helps you out. Take care. Rick

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Car is running hot I think it's my water pump .


The most likely causes of a hot running engine are the following:

1. low antifreeze level in the radiator and cooling system.
2. fan not turning on at operating temperature.
3. restrictions in the cooling system such as sediment build up.

Water pumps usually leak when they are bad, and can cause an overheat because of low coolant level.
Check whether the water pump is leaking after topping off the coolant level and running at operating temperature, and then shutting off the car's engine.

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It`s easy to see if the water pump is working just drain some of the fluid out of the radiator and look inside while vehicle is running NOTE due this only when vehicle is cold.
Know if it`s not flowing after it starts to warm up then either the thermostat is stuck closed or the water pump is bad i would start with the thermostat if i where you the other job is a lot harder and more expensive
Also the fluid disappearance could be caused by the fluid boiling out when it gets hot one last note check pressure cap on radiator for wear or cracks if bad replace hope this helped you.

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