Bob Nakamoto: the thermostat can be stuck, or even remove and car will run,. So it might be no letting water cool down if it is stuck.Fan is on constantly trying to cool water but doesnt have a chance.. start with thermostatThats what i said ..start with thermostat...Show more
Russell Mckinzie: It isn't the job of the A/C to cool off the engine, its just that the A/C fan is cooling off the heater core of the excess heat. The heater core is just a small radiator that blows heat into the car on cold days. To prove this, next time your car overheats, turn on your heater in the car and the fan and you'll see the engine will be getting cooled off as it is helping the big radiator. It is an old trick to cool off the engine when it is overheating. The most likely problem is a partially blocked thermostat. Highway driving pushes more air through the radiator, but as soon as you drive slower in town, it will heat up.It could also be a blockage in the radiator, but try t! he thermostat first....Show more
Hong Hunkin: Let's refresh your incorrect theory: Any engine temperature INCREASES when the air conditioner is on. The HEATER only will help to cool the engine. The sooner you nave an inexpensive *cooling system pressure test done the sooner you'll find out if you have any external or internal cooling system leaks.What do you think makes coolant pee out of the plastic coolant recovery reservoir? The answer is compression pressure past a leaking head-gasket....Show more
Elvin Weichbrodt: There is a fan temperature switch on the engine thermostat housing that cycles the electric cooling fan relay.Pull the connector off of it and short it with a jumper, you get fan? Yes, replace the switch.See the green connector in the pic labeled temp # 1 - temp # 2 is the second fan temp switch.http://img31.imageshack.us/img31/7711/1994accorddx......Show more
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