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-   4.0 SOHC / 4.0 OHV Tech (http://www.fordrangerforum.com/4-0-sohc-4-0-ohv-tech/)
-   -   engine overheating? (http://www.fordrangerforum.com/4-0-sohc-4-0-ohv-tech/38256-engine-overheating.html)

dmrodriguez5 07-21-2011 04:35 PM

engine overheating?
 
so here's whats going on. when i'm driving around town and have the a/c on my engine occasionally overheats and the needle hits H, a quick fix is turning off the a/c and it immediately drops back to mid range level. however, it does not smell like the truck's engine is burning or anything like that so i'm confused?
also when i have the a/c on on the highway it doesn't seem to overheat. any ideas??

ObsoleteE 07-21-2011 04:43 PM

Re: engine overheating?
 
Check your coolant level, and change your thermostat to start.

Rg1Baja 07-23-2011 04:48 AM

Re: engine overheating?
 
Start there /\ /\ /\

FireRanger 07-23-2011 05:42 AM

Re: engine overheating?
 
Doubt the thermostat is the culprit if the AC is exasperating the symptoms. I suppose its possible it is stuck not opening all the way but this would be extremely rare.

Having the AC running basically is pre-heating the air that goes through the radiator reducing the amount of heat it can dissipate. If that is actually causing a problem then it could be:
- Low coolant level. On a cold engine, the radiator should be full when you look inside and the tank should be 1/2 full.
- Failing water pump not moving enough volume to dissipate the heat.
- Clogged old beat up radiator not dissipating enough heat


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