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sprinkles08
sprinkles08, ASE Certified Technician
Category: Infiniti
Satisfied Customers: 22114
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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04 g35 overheating

Customer Question

04 g35 overheating
Submitted: 4 months ago.
Category: Infiniti
Expert:  david craig replied 4 months ago.

Hi Im David. has any maintenance been done on the vehicle lately/

Expert:  david craig replied 4 months ago.

how high is the temp gauge getting to?

Customer: replied 4 months ago.
I changed the tsta, then the temp sensor. Brought it to infinity they said they found s small leak in the top tank. Changed the radiator. Replaced coolant slowly until it came out of bleeder. Same thing still overheating.
Expert:  david craig replied 4 months ago.

ok. so you replaced the t stat and sensor because it was overheating?

Customer: replied 4 months ago.
Expert:  david craig replied 4 months ago.

was the t stat radiator hose not getting hot? was the temp sensor failing its resistance test?

Customer: replied 4 months ago.
Temp sensor resistance was ok. Just changed it because I had one.
Customer: replied 4 months ago.
I have not checked if the heater is working.
Expert:  david craig replied 4 months ago.

did you do a pressure test on the cooling system?

Customer: replied 4 months ago.
it had a very small leak at the top tank on the radiator so I changed it
Expert:  david craig replied 4 months ago.

ok. and you bled all the air out i see. are you losing coolant also?

Expert:  david craig replied 4 months ago.

internally maybe?

Customer: replied 4 months ago.
No I never saw a leak. Only whenI pressure tested.
Expert:  david craig replied 4 months ago.

so you're not losing coolant, all air is bled, t stat and sensor id replaced along with the radiator. does this have a pressurized reservoir or does the radiator have its own cap?

Customer: replied 4 months ago.
I don't see any indication on the exhaust. If air is trapped I don't see how it would not circulate to the radiator eventuall
Customer: replied 4 months ago.
Radiator has cap
Expert:  david craig replied 4 months ago.

did the new radiator come with a new cap?

Customer: replied 4 months ago.
I put a new one.
Customer: replied 4 months ago.
Can you run this car without a tstat just to diagnose??
Expert:  david craig replied 4 months ago.

yes you can..... but i was going to say check for air again and bleed it again.

Customer: replied 4 months ago.
Ok do you need to lift the front end
Expert:  david craig replied 4 months ago.

no and the most common cause of over heating is either the cooling fans are not coming on, or the coolant system is not bleed properly

Expert:  david craig replied 4 months ago.

ive done it both ways. so whatever suits you.

Customer: replied 4 months ago.
I will try bleeding it again tomorrow. I will let you know. I do remember that when it was hot I tried to turn the heater on for more cooling capacity and the heater did not get hot. Does that indicate air in the system
Customer: replied 4 months ago.
Should you turn on the heater to circulate coolant thru the hater core
Expert:  david craig replied 4 months ago.

yep. not a bad idea at all.

Expert:  david craig replied 4 months ago.

hows it going?

Expert:  david craig replied 4 months ago.

hello????????

Expert:  david craig replied 4 months ago.

still need assistance???

Expert:  sprinkles08 replied 4 months ago.

Hello and welcome to JustAnswer!

there are many possible causes for overheating but you do need to start by making sure that it's bled properly, it looks like it may not have been. After filling the system with the bleeder open then the engine needs to be ran to operating temperature with the radiator cap off until the heat is working correctly at idle, the engine is at operating temperature, the coolant level is stable and no more air comes up. This will take 20 minutes or so from a cold start in a warm environment, longer if outside and cold. Has it yet been bled this way?

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