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Jay, Nissan Technician
Category: Nissan
Satisfied Customers: 19857
Experience:  20+yrs experience with Nissan & Infiniti Trained & Certified.Currently still working for Dealer
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Nissan/Datsun 350Z My Nissan 350z is overheating I changed

Resolved Question:

My Nissan 350z is overheating I changed the thermostat and the radiator cap!! The fans are working they won't shut off and still overheating
Submitted: 6 years ago.
Category: Nissan
Expert:  Jay replied 6 years ago.

Jay :

Hello and thank you for using

Jay :

I would start by bleeding the coolant system and see if that helps.

Jay :

To bleed the coolant system, remove the radiator cap. Install the coolant bucket. Fill the bucket about 1/2 way. Then raise the front of the car as high as if it were on ramps. This way if there is air in the coolant system, the circulation brings it to the highest point. Then turn on the car, and put the heat on speed number 4, recirc mode on, and face mode. You may need to rev the engine to move the coolant around to get the air out. After you have good heat, and little to no bubbles in the coolant bucket. Then the coolant system is properly bleed. You should have good heat when bleed properly. So when you put your hand over the vent and hold it there for 30 seconds, you get a slight burning sensation. That is perfect heat.

Customer: Do you think it can be the water pump
Jay :

If you can't get a coolant bucket you can make one see image.

Full Size Image

Jay :

Water pumps never really fail on this engine.

Jay :

Most of the time it's just air in the coolant system

Customer: Because it's only when I drive the car if it stays still it won't over heat unles I start driving it
Jay :

That could be air in the coolant system or a restriction in the radiator.

Jay :

I would try to bleed the coolant system first

Customer: Ok I will do that if for any reason it's not that what can I do next
Jay :

Well when you bleeding it and after you have it all set, see how it is, and then you can return if you like and I can continue to give you my thoughts on your problem if that doesn't work

Jay and other Nissan Specialists are ready to help you