Suspect water pump

Z_ealot

yes there is...I drained the coolant system this last weekend took of the thermostat and did a back flush on the entire system, put everything back together and it seems to have helped, turned on the AC last week during a 90 degree day and it didn't overheat....coolant temps stayed around the low 190's with ac on so I guess we'll see how it goes and i'll chime in if anything else comes up

Jhill

That is truly weird considering your input and out temps before. I really wonder if you just had an air pocket that wouldn't come out before. That's what it sounds like to me, we once had a vette that the dealer released 3 times and 3 times it overheated with the customer (embarrassing that it left without being verified 3 times and our dealer was one of the best but when the wrong people get assigned to the car then only so much can be done). Anyway it was trapped air in the upper crossover pipes. Do a vacuum fill and done no more issues, sometimes it really is the simplest thing.

Z_ealot

Question: is there a way to test the high and low speed cooling fan function on our cars? If you didnt see the video already i did test them with a direct 12 volt from the battery which im assuming would run them at their high setting, but cant seem to find an answer anywhere on how to test the low speed setting.

SouthArk370Z

According to page EC-486 of FSM, "Cooling fan motor receives cooling fan motor operating voltage from cooling fan control module. The revolution speed of cooling fan motor is controlled by duty cycle of the voltage." Ie, it turns the power on and off real fast. An oscilloscope would work to check output.

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Z_ealot

So what you're saying is im SOL lol

SouthArk370Z

You should be able to rent/borrow an o'scope.

Some multimeters will work and would be easier to use/interpret. https://duckduckgo.com/html?q=multim...uty%20cycle%22

__________________
Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub
Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

Z_ealot

What im wanting to test is the fan motors themselves though, the control module i know is good as it is s brand new unit, the motors on the fans is what im unsure of. I've seen guys test the fan speeds with the higher priced scan tools, but just wasnt sure if there was a way to test the motors at their different speeds without that

Optimiser

I'm amazed at how complicated this is getting to try and resolve! Interesting though.