my engine overheat

[aboturky839]

hey everybody how are you doing my trailblazer is overheating for no reason the relay is new the fan clutch is new the coolant is new the water pump and the thermostat are new and still P0495 comes out sometimes and the car in the morning have a loud speed noise but after it reaches the temp it becomes normal and starts to heat up and reach over 210 F and the water boiles out from near the radiator cap out of the hose and comes out dont know why ?? any help ?

 

[Robbabob]

Can you test the t-stat? I know it is a stretch, but it could be failing closed.

Next would be a wiring issue to the fan. No codes is weird.

 

[Sparky]

Have you replaced the radiator cap? If they fail, it can cause overheating even when other stuff is working properly.

 

[HARDTRAILZ]

Air in the system

 

[Tiggerr]

Air in the system

+1 or...blockage...or compression leaking into cooling system

 

[aboturky839]

sorry i was late i fixed the leakage of the water because the radiator top cover was bad and i changed so no leak anymore but still the same tempreture and the proplem why the fan is loud at cold start only after that when it heats up and overheat the fan is at idling not more than 600rpm weird thing with P0495

 

[Sparky]

At idle the fan can't be any higher than 600 RPM because that's all the engine speed is.

 

[aboturky839]

yes i know but atleast it goes up a bit more so it cool down the engine the fan clutch is not engaging only when it is cold at cold start

 

[Tiggerr]

Bad fan switch/sensor/module whatever they call it on these, I would think. Bad connection maybe. Possibly the clutch itself.

 

[AWD V8]

You can test the circuit easy with a needle and a test light.

I'm on my phone now and not able to post the video but check out my posts and you will find it.

Found it.http://s407.photobucket.com/user/AWD_V8/media/Envoy/testlight_zpstfjlndcn.mp4.html?sort=3&o=0

 

[HARDTRAILZ]

Do you have the thermo clutch?

 

[Mooseman]

If he's getting the P0495 code, it has to be electro-viscous. Maybe swap the relay with the one for the headlights (they're the same) and see if it improves. Another thing to check is for any blockage in the radiator and A/C condenser. Another member from SA had a lot of sand in it.

 

[aboturky839]

yup it is the electro-viscous and i did swap the relays but nothing happened the headlights remained on for both relays

 

[Mooseman]

Check my signature on how to test the electro-viscous fan clutch. You could have gotten a dud. What brand was it? Do you have a scanner or other method os getting actual temperature readings from the OBD rather than relying on the gauge? You say that the coolant boils out near the cap. It shouldn't since it should overflow into the coolant tank. Is the hose properly connected? Has the cap been tested or replaced?

 

[aboturky839]

i fixed the boiling water by changing the radiator top cover but still the temp is the same i have an obd2 and will post for you the temp i reach when it overheat