Is it overheating only with the air conditioner activated? If so it could be that that AC compressor is low on freon and causing the compressor to work harder or that the compressor is starting to give you some problems.
You need to find out just when the temperature is going up! What accessories you have active, and what type of driving you are doing to accurately diagnose the problem. Most of the time you can tell where to look by when the temperature starts to climb.
SOURCE: Hi, I have a 2001 nissan
hi. was just looking at your problem of (sentra) overheating and actually, i am a mechanic for nissan and have changed many head gaskets for this particular vehicle equipped with 1.8 liter motor and found that they are notorious for this problem of faulty head gasket's.Unless you did't properly bleed the system,which i doubt because you seem mechanically inclined since you already changed every other part of the system,i would't doubt that this is the problem.Anyway, by the time you read this, you have probably already found this out..Just thought i would let you know this info.Good luck!...by the way,if you haven't already changed you cam and crank sensors,do that too,before you get stuck and get the part's at the dealer!!!!-they are redesigned from the old one's!!just some advise to try to help you out!!! John from N.Y.
SOURCE: 96 Blazer Overheating
Yes the issue is most likely an air block, jack the front of the truck up as far as you can, fill the recovery bottle and run the engine for about 10 min, then shut down and run cold water over the radiator, this should purge the air, recheck the recovery tank and refill as ness.
SOURCE: Overheating fiat seicento
I hope you have managed to solve the radiator problem by now. Seicento seem to suffer from water flow blockage in the heater blower area. I recommend you check the piper behind the carburator and make sure water is flowing. Normally when these pipes are blocked, water will flow back to the expansion tank and start leaking through its cap. You can also open the small screw on the small pipe coming out from the back panel behind the carburator and see whetehr water flows. Also, if the water is heard grumbling when engine is switched off, it is highly likely that the water is not flowing through the heater unit. Hope this helps.
Cheers,
Andrew
SOURCE: overheating change thermostat water pump
If the head and gasket are good, and hoses not blocked, and the coolant pump is good and the rad is not blocked, all sensors and thermostats good, then it could be the heater core.
If you can bypass this during summer, it may help. The heater core is like a very small radiator, and often they get blocked up. This can restrict the collant getting around the engine properly, and cause overheating. If you leave this bypassed, you won't get hot air blowing into your cab during winter with the heater on --------- hey, who cares right now when it's summer!
SOURCE: 1996 Cadillac Deville overheating- head tested, no
remove pump and check that the imèller which is plastic hasnt seperated from drive shaft
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