[Stymees'mont]

Today i was driving my 04 Titan 4x4 and sitting at the light I lost heat.
Then I noticed the temp gauge climbed as I took off from the light. Then the temp dropped back to normal and the heat came back. This all happened within one minute.
Normally this is a sign of a head gasket.....
Anyone else have this issue?
Any ideas?
No codes pertaining to this. Tho i have 2 codes PO507 and PO455.
These 2 codes I have had for a long time. The first is a High Idle issue. The other is an EVAP leak which I have the new part for this damn solenoid
for the canister. I see they have an updated version now and hope it fixes it.

 

[tslave]

Done anything to the system lately? Can mean you've got an air bubble or pocket. Never had it on my Titan, but had it on another vehicle.

 

[Smccarty3]

Maybe you thermostat got stuck closed. It's a cheap part that might be the culprit.

 

[Stymees'mont]

3 years ago replaced the radiator.....cant believe I could have an issue there. But then again could be too.

 

[HRTKD]

Check to make sure the engine's clutch fan is working properly. When the engine is warmed up (and off) the fan should be stiff when you try to rotate it.

 

[Pickle-Smooch]

Maybe you thermostat got stuck closed. It's a cheap part that might be the culprit.

Bingo! How many miles? When was the last time you did a thorough flush of the coolant system?

 

[Stymees'mont]

I flushed it out when I replaced the radiator and thermostat was also new. I only buy high quality parts too.

 

[Stymees'mont]

So I did a little checking on the clutch fan. It spins fine with a little resistance as it should tho it has a little wobble. So i guessing I need a bearing. I am going to get a better look today.
The weird issue showed up again yesterday so I am getting concerned.
I see there is a clutch bearing bracket and clutch fan,so that means it is not bolted to the water pump. I usually replace the water pump just for insurance. I know the clutch fan needs a special wrench but I see one is called for the water pump.....is that true?

 

[HRTKD]

I removed my clutch fan with basic wrenches. 10 mm or 8 mm as I recall.