Overheating problem

R

Rodney Vegas

Registered
I have a 2001 LS v8 my car was fine all summer in the Las Vegas heat and then when it got cool outside this week i turned off the air and the car started to overheat. I turned the air back on and the temp went back to normal. yesterday i tried to drive again with the air off and again the car overheated..anybody got any ideas??
 
My car overheats when the air is turned off, this thread talks about a car that overheats when the air is turned on..think it could be the same problem??
 
Very probably. It can happen either way, depending upon how the faulty fan motor responds to increased fluid flow.

A defective hydraulic fan is the single most common reason for overheating in 2000-2002 LSs; I've replaced dozens! Read the Ford TSB posted in that thread.

Still, if it were my car, I'd be getting the OBDII system properly diagnosed or at least scanned for fan flow error codes before jumping on a $700+ cooling fan motor that's difficult to install just because some guy on an internet forum (no matter how knowledgeable he purported to be) told me to.

Oh, by the way, Driller, if you're reading this, related to our previous discussion: Ford returned to a variable electric fan in 2003 and newer LSs because the hydraulic system was such a disaster.
 
Frankie X said:
Oh, by the way, Driller, if you're reading this, related to our previous discussion: Ford returned to a variable electric fan in 2003 and newer LSs because the hydraulic system was such a disaster.
Click to expand...

That's good to know! :)
 
Rodney, let's backtrack a bit.

Have you covered the basics? Is the cooling system full? Early LSs were known for leaking overflow bottles and/or thermostat housings. As the coolant level dropped, airlocks were created within the system.

Please be clear about what you mean by "overheating".
Does the gauge go into the red?
Does the little red thermometer come on?
Does your message centre display "check engine temp", or "engine power reduced", then possibly "pull off road safely"?

When the A/C is on, the fan runs constantly. When it's not, the fan is turned on by the PCM only when coolant temperature gets high enough to demand it.

At idle or in stop and go traffic, it is absolutely NORMAL for the temperature gauge needle to rise above the horizontal position, sometimes almost 2/3 of the way up, before the fan comes on and drops it back down.

Is that all you've got?
 
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