02 q45 0verheating need help

[vlad90]

i have an 02 q45 and it started to over heat. i did a flush changed the radiator and thermostat and it still overheats. any ideas how to fix?

[N/A Q45]

Rad fan not working, ?

[vlad90]

fan is working. spins faster when car heats up and goes full blast when it starts to get to a high level

[N/A Q45]

Does your heater blow hot air still?

[vlad90]

yea heater works fine a/c works too. everything works but the car overheats.

[N/A Q45]

Are the cooling fins on rad or one for the a/c clean and clear so air can pass through them easily? Enough bugs, dirt and other things can block either one and you really can't tell unless you take it right out as you cant see them very well on most cars, but I honestly haven't seen a 02 q45 to know if you can or not.

[vlad90]

I have cleaned the condenser and the radiator is new

[N/A Q45]

Humm. I doubt the timing could be jacked up too high on that new of a car, but if it was could cause it to overheat as well as running to lean. No CELs? And is the coolant level fine? Never drops or anything? Rad caps in good condition?

[vlad90]

there is no leaks cap is new. no engine light. i might have to take out the condenser and pick on it to make sure its really clean. i also ordered new hoses maybe one of them is bad and blocking the flow. and the timing has never been messed with so it should be fine. it started heating up last summer. but it did that only once when i ran it really hard up a hill when it was like 110 outside. but its been dooing it more often now. a 30 minute trip would cause it to heat up

[OwnerCS]

What type of thermostat are you using? Where are you located? There might be a member or recommended shop near you.;

[vlad90]

I got a Murray Temperature Control Plus 170 degree thermostat. And I live in wenatchee Washington.

[vlad90]

i pulled my condenser today and it looked fairly clean

[N/A Q45]

I'm sorry I don't know much about your model, the only things I could think of is what I mentioned, I was thinking a air pocket but you said your heating works fine. I guess you could (when the car is cold so u don't burn yourself) park it facing up a steep hill, take off the rad cap let it idle and see if any air comes out. Just don't burn yourself

[vlad90]

i think that it might have air. because sometimes the temperature spikes up and back down right away

[black g50]

Replace coolant cap...Then check oil level,could be low causing her to heat up.Had a old 84 Buick seize up from lack of oil,same description.

[vlad90]

I check oil level every week all good there. Cap is new. Pulled the condenser and cleaned it. New radiator. New thermostat. Still heats up.

[vlad90]

On the m45 forum I read that if the thermostat opens too early it will not allow the coolant enough time to cool down and would cause it to over heat. Could that be the issue with mine since mine opens at 170 instead of 180?

[Q451990]

Not sure on that...

Check out the bleeding procedure in section EC of your car's service manual - available at www.nicoclub.com/FSM/

I also noticed a separate "coolant control valve" in the loop that I've never noticed on other cars... I'm not sure what would happen if something failed on it...

Heath

[vlad90]

I just had my uncle look at it and he says its probably the head gasket. He says not try tightening the head. And if not replace the gasket. I'll.try that

[N/A Q45]

If it was the head gasket,, wouldn't there be a sign. Burning white smoke, water in oil, oil/gas in the coolant, coolant level droping or raising. A leak. That's what I would be looking at