Overheating...

[Austin]

Truck is intermittently overheating when idling. Temp rises fast enough that stopping at a light gets hairy. Temp returns to normal when moving. I have two e-fans that are fully operational. Thermostat to blame?

 

[Beach66Bum]

did you change the coolant?

 

[Truckin4life]

You have a infrared thermometer?

 

[Beach66Bum]

If it's the thermostat, it would be running either to hot or to cold all the time. You can check the thermostat by placing in hot water to see the movement

 

[Austin]

did you change the coolant?

Haven't touched it.

You have a infrared thermometer?

Negative.

 

[Beach66Bum]

The reason I asked about the coolant change is that sometimes you can get bubbles in the coolant if not properly changed.

My Mustang would overheat at idle and go back to normal once I started to drive again. It had crap in the water jacket passages (not saying that this is your issue Austin)

 

[Austin]

I had that problem in the Lincoln.

Did some fiddling around and found a loose connection on fan number one. Doubles speed when I move the wire joint. I'm going to pull the unit and rewire everything... picked up a t-stat just for the heck of it.

 

[Beach66Bum]

Sounds like you have it Austin, and a new t-stat won't hurt. Did you get a gasket too?

 

[Austin]

FelPro.

 

[Beach66Bum]

Of course!!

 

[O'Rattlecan]

Yeah your fans aren't cooling adequately. If it cools off when moving, that tells me your thermostat is opening up okay. Either the fans are underpowered, wrongly installed, or they aren't activating at the right temperature. The fact that it cools off while moving tells me that when it gets adequate airflow, it's fine.

Ryan

 

[smokey]

Could be the water pump is getting weak and reduced flow til higher rpms.