Question about 2002 Nissan Sentra

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Nissan Sentra 2002

I was told that my Nissan has a coolant leak. The External Head Gasket has green coolant around it. I am a older women who knows nothing about cars so please help.
My car only has 24,000 miles on it.
I need to know if it should be repaired and where as I live in Portland, Oregon.
Also took this car into Nisson Dealership for inspection 2 months ago and they (to make this short) did not find this problem.
A Mac's Cooling shop found this problem as I also needed a new Radiator etc. as it was also leaking coolent.
Hope this makes sence as I am in hurry.
Thank you,
Sheila Smith

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Take it to your auto parts store in town (call around to find one that can before you leave your driveway) and have them do a radiator preesure test. Won't cost a dime. If it pressure to 30 p.s.i. and holds, you more than likely don't have a problem and the techs were pointing out a previous problem and didn't know it had been repired.

Posted on Jan 10, 2009


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2002 Nissan Sentra temperature guage on dashboard shows engine running hot, it'll then go back to normal, then hot, a continous cycle. I have changed the thermastat but the problem still exists. Wha

Hello again
The problem here based on what you have told me is that you have a cylinder head gasket leaking combustion gas into the cooling system, this creates gas pockets around the thermostat and delays it opening. You can try adding one of the many head gasket sealers available in auto parts stores. I suggest you contact a local NAPA or Carquest auto parts store and ask what they think really works, I' heard that many do work but have no 1st hand knowledge. To make sure air is not in the cooling system do the following, you will need a floor jack. If the problem persists you will need the head gasket replaced and the cylinder head checked for cracks and if it checks ok then machined flat again.

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1997 Nissan Sentra overheating and will not hold water/coolant. No visable leaks??

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If, in fact, you're loosing coolant thru the tailpipe, then I'd expect you have either a blown head gasket or a cracked head.

Check around with friends, relatives, neighbors, etc. and try to get a consensus on a good local mechanic, then go to him for diagnosis.

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1 Answer

2002 nissan extera. 6-cylider. engine over heated. The thermostat has been replaced and the old coolant has been replaced. The engine still over heats with in a 15 minute drive at a average speed of 45...

If the info of where the leaks are is correct, you need to replace the head gasket. Are you seeing the level of coolant drop? Since this is happening in 15 min. check your cooling fan(s) to make sure they are operating - that is, kicking on as the temp rises. There is a possibility that the fan is not going on due to a failed switch or motor, and that is the reason for overheating (hope it's that and not the head gasket. For it to be the head gasket, you would have to have a pretty severe leak for it to overheat that quickly).

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I hate to be the barer of bad news, but may be the head gasket.

My car started with rough idle. Then very hard to start in cold weather. Next started overheating, but no output from heater. Trickling sound from behind dash board. Overflow bottle overflowing.......

I replaced the water pump, radiator cap, thermostat, coolant, fan belts, power flushed the system. Nothing worked. Some research gave me the answer.

The head gasket leak was allowing exhaust gases to enter the cooling system, displacing the coolant. After use, as engine cools, coolant is sucked back into the system and coolant seeps into the cylinder. This gets worse over time.

First thing you'll notice is the rough idle as the spark plug burns off the coolant in the cylinder. (This is especially true at low temperatures.) If it is the head gasket, the other symptoms will follow as time goes by.

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