Engine Cooling problem
1996 Toyota 4Runner 4 cyl Four Wheel Drive Manual 132000 miles
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I had the head replaced and all is well in that area, so it seems. It passed emissions easily however it starts to overheat after driving for about 20 minutes. It seems to heat up real quick if the A/C is on. I replaced the thermostat, there is no coolant leaking, no white smoke from the tail pipe. I am at a loss. I need to sell my truck but don't want to sell a lemon. HELP!!!!

Does the fan clutch tighten up and pull air when it gets hot? Look for a fluid leak on the front of it.Does it get hot ifit sits and idles or just when driven?

How do we check that?

when idling warmed up, does it pul alot of air through the radiator?