Over Heating

[mxz583]

i have a 94 Explorer that will over heat suddenly and than will be normal i have replaceed the water pump, thermostat , rad cap it seems to run fine except for the over heating problem

 

[sn0border88]

Take it in any mud lately? Clean off the radiator? Clean inbetween the radiator and condenser?

 

[Vanquish502]

*cough head gasket *cough

 

[BrooklynBay]

Are you sure that it is overheating? Your temperature sender could be giving a false reading on the temperature gauge.

 

[marragtop]

Did replacing the Tstat make any difference at all?

 

[mxz583]

I have found that the over flow bottle has a stream of bubbles coming from it i think it has a bad head gasket or a cracked head i have replaced both heads about 5 years ago so i hope they are not crack again

 

[marragtop]

The head shouldn't be cracked unless it got real hot. Hopefully, it's just the head gaskets.

 

[Diff Whack Daddy]

It could also be the radiator is clogged. I ended up swapping a motor once because the radiator shop said my whole problem was a bad head gasket. I swapped motors and the Ex still overheated. They finally rodded out the radiator only to tell me that it was 80% clogged. I have seen Explorers run arround for years with a bad head gasket and not have overheating problems. My neighbor has one and it has had a crcked head gasket for 1 1/2 years now and still runs fine. They just add water every now and then.

 

[alexefron]

some people have replaced t-stats only to have the new one be bad. It might be worth doing a flush and fill, and replacing the t-stat at the same time. Also the cap is probably worth replacing at the same time considering you can get an aftermarket one for around $4 at most auto part stores, and rubber seals tend to wear out after time.

 

[shamaal]

One other thought, I had a cracked fan blade. It was cracked at the hub not actually one of the blades. Everything would spin and look normal, but there wasn't any real force behind it.

 

[alexefron]

fans only really help cooling when you're stopped.