Or this..The most obvious first guess is the radiator fans stopped working. It could be the motors in the fans (though it'd be odd for both to fail at the same time), or it's the relay for them that turns them on. A/C and fans connected together by software. A/C will shut down since fans must be detected on before PCM ( power-train control module) which allows A/C to go on. No fans=no A/C. and overheating! Get the fan relay replaced first would be my suggestion. Go to auto parts store they may install it for you tis not a big deal.
Most likely you have a broken belt. As a result the AC compressor is not turning and more importantly, neither is the water pump. Replacing the belt is easy but why it broke is another question. Might have just worn out but If I was a betting man, I'd bet the water pump is seized and will have to be replaced. Don't drive the car more than a couple of minutes before having this checked out.
SOURCE: 1999 mercury cougar only blows cold air, no heat.
if the car is overheating the thermostat is stuck closed if the car is not overheating the heater control valve may need to be replaced
SOURCE: Interior lights will not turn off.
dimmer control turned all the way will switch on interior lights, if not may want to wd40 switches that the doors engage when shut. These are small usually push button types, they do break too and are adjustable
SOURCE: 1999 mercury cougar 2.5 still runs hot . 240 .
OK, that is getting kind of hot. I would check that the fan is turning on when it reaches normal operating temperature.
Recently, I had to replace both fans, the relays, and the relay contacts on the harness to fix a similar problem on a 1997 Cadillac Deville Limousine.
The heat got tot he relays and messed things up.
Hope you can fix your overheating problem like I did.
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