Since I got my '93 Camry, the A/C worked like a champ. My radiator needed replacing (salt air in CA got it), and when I tried the A/C a week later, the compressor doesn't click, it won't cool, but light comes on.
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Radiator may have rust/salt deposits inside, if that is case its cheaper and better to change the radiator. Also for future don't use normal tap water in radiator, use a coolant + ph balanced water meant for radiators to reduce salt buildup inside radiator.
Also check the radiator fan is working ok and rotating in the right direction, sucking cool air inside not blowing out hot engine air to the radiator. Some electric fans can have wires mixed up so they start in the wrong direction. (make sure fan is sucking cool air outside towards the engine).
In some cars, radiator fan has a top cover that stops hot engine air getting sucked by the fan, if your car has it, make sure it is fitted properly and is in good order.
Some cars have a fan fitted on the AC condenser, make sure this fan is working as well.
I think ur THERMOSTAT is fine!
The prblem of heating up would be the RADiATOR FAN MOTOR, 'cause engine cool down when ur speeding u, means theres a cold RAM AiR flowing in front of ur car and its cooling down the radiator!
You have to go to ur garage mechanic and have them check wuts wrong w/ ur RADiATOR FAM MOTOR!
Nice to help somebody!
Check for air leaks in the vacuum pipes in and around the inlet manifold, they have a habit if going brittle and splitting. Another possibility is the temp sender , if the ecu thinks the engine is too cold it will compensate causing the engine to " hunt". This can be something as simple as a worn radiator cap seal letting air into the cooling system and tricking the sensor. Hope this helps, Marshall
A radiator fan is designed to pull air to pull air through the radiator to help cool it, while blowing the air on back across the engine to try to assist once again at keeping the unit running cool as to not over heat.
You either have a thermostat that is stuck in the closed position, or an air pocket in the system. I would remove the thermostat and see if the overheating stops. The stat is most likely the culprit, but, if there is an air-bubble in the wter pump, it will not move the water; the cooling system will need to be bled to remove the air. To do thi, hack the font of the car up as high as you can get it, and let the motor idle. The air pocket will rise. Just leave the rad cap on a bit loose, and swqueeze the top hose to help purge the air.
either an air pocket in your cooling system or waterpump is bad. for air pocket, jack up the front end of the car where the radiator cap is, start car, and keep adding fluid till full and blowing warm heat. note, might have to squeeze upper radiator hose to help get the air out. if doing that dosn't help any, odds are you need a new water pump.