My car ac turns on fine but and works good, but on hot days it over heats the car. i changed the thermostat, that didnt solve the problem i changed the ac fan, replaced it with a new one but still did the same thing.. but wen i turned the ac off the tempature is fine i dont know what the problem might be but it mostly makes the car over heats on hot days thats y i have the fan runing nonstop now. but the problem is still here..i dont know
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You need to ensure the engine is running when you are testing the AC or heating systems, as they rely upon a compressor to work the heat pump.
If your engine is on when you are testing this and no different temp air comes out, you should ensure your AC system is properly charged with coolant and that the compressor is engaging and functioning. If not, it will need to be replaced.
Good point. Solving it will probably take more time than money.
Thermostats and heater cores do not work one day and stop the next. If your engine warms up normally and doesn't overheat, the gauge reads normally, engine is at normal operating temperature after about 10-15 minutes ...all these point to a good thermostat. It is working right and should not be a problem.
To check the heater core, wait till engine is at normal operating temperature. Turn heat setting to high, then feel both heater hoses-both should be hot. If both are hot the core is circulating coolant and is not a problem. If only one is hot (which would be the inlet hose) the core is not circulating-could be an air block or the core is plugged up and will need replacing.
If heater core and thermostat are good, then it probably is the temperature blend door in the heater case. The door actuator is probably vacuum controlled. I don't know how difficult it is to troubleshoot on your Taurus, but check if vacuum controls are working right from the dash controls, check if the blend door is stuck, is broken, or if the vacuum control is working to open and close the blend door. When you want heat, the blend door should let blower air pass across the heater core.
From the engine you will have a single vacuum hose that goes through the firewall into the dash to the heater/AC controls. There, a pod like device can rout the vacuum signal to various doors on the heater case.
check the hoses going into heater core. are they hot with heater on! if not make sure you have a proper amount of coolant in it. if coolant is ok and all is fine. change thermostat. good-day ! if hoses are not hot its a possibility, that the thermostat is sticking closed and not letting hot coolant through system.
AC is only the cold half of the thermostat, if you want heat to come out turn off the AC and turn the heat on, if there is a problem it could be the thermostat is stuck open or closed which could possibly needs replaced and when you do that you would also need coolant
check and see if both the ac and heat are on at the same time .i
suspect the connections to the thermostat are wrong .if it is a 4 wire
system .then red is your 24 volts .green is your fan .white is your
heat and yellow is your ac [.if there is a r-c and a r-h lug on the
thermostat .jump white to r-h and jump yellow to r-c .but only if you
still have a problem after you install the 4 wires