Question about 2000 Plymouth Neon

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Ac runs hot

The air conditioner starts out cool then becomes extremly hot

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  • Plymouth Master
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If the electrical cooling fan for the AC condensor is operating, I'd just try adding a can of R134 to your system. It isn't costly and it may have just fallen too far to be effective. The coolant molecules are so small, hardly any system remains tight enough over the 8-9 years you have used the car to avoid some losses.
If the fan isn't operating, you need to find out if the fan motor is at fault or a relay isn't turning the fan on with the AC. 

Posted on May 22, 2009

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Posted on Jan 02, 2017

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I have ford mustang 1999 when i start my car and


there will be a cooling fan in front of the condenser ( ac unit in front of the radiator) that should be running as soon as you turn the ac on. If that is not working then the head pressures for the compressor become excessive and to save the compressor from damage it is shut of at the clutch at the pulley. When you are moving there is air flow through the condenser and so the head pressures are maintained at the correct level. Have it checked out by an accredited auto ac specialist . If you have a viscous fan hub on the engine fan the consider replacing it as it is not pulling air through the radiator when idling

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The AC puts allot of heat load on the engine so of course it will run hotter but not overheat the engine, if that happens you may have a clogged radiator.

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I would suspect a stuck cooling fan relay. Your going to have to locate the malfunction to get the operation that you seek. Reference owners manual for lcoation of the cooling fan relay and try switching it out.

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AC does not blow cool when car is stopped, air is blowing hot. when car is moving th air becomes cool again.


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is running with the a/c on , if not tap on the back of the
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My 2002 Expedition air conditioner will sometimes blow hot air and others cold air


I would check the following possibilities:
1. Is compressor clutch working? - You need to do this when the ac is blowing hot air only - locate compressor drive pulley on engine - rubber belt wraps around it. Start engine and set to max ac. When the ac is blowing hot air, look at the center of the compressor drive pulley using a good flash light - watch it for a while, it should be spinning with the pulley - this means the compressor is engaged. If not, the compressor is not engaged. If your ac is blowing hot air, then the compressor should be engaged and running (trying to cool). If it is not engaged, then your compressor clutch is probably going out. Could be low voltage to clutch, but more likely the clutch is worn out and only working some of the time. Note: if working normally, the compressor clutch will engage and disengage in cycles- but the air should always be cold. If clutch is bad, compressor would need to be replaced (sold as one unit). This is tricky to diagnose and could take some time - you need to do it when ac is blowing hot air but set to max cooling.

2. Low on refrigerant or refrigerant has moisture in it? If your ac blows cold initially after being off for a while, then heats up, and continues to regularly cycle back and forth between hot and cool air, then the system may be low on refrigerant or the refrigerant may have moisture in it that is freezing and restricting refrigerant flow. An a/c shop can check refrigerant level and even replace refrigerant if moisture is suspected.

Could be other issues, but I would start with these.

Good luck

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Every single grand am I have owned does this!! They seem to have a gas smell when running the ac, or if it is extremely hot outside..It was the coil pack on 2 of mine. The extra load of the ac..the other was it makes the car run hotter. I just rigged my radiator fan to run constantly and the smell went away.

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sound like a blown head gasket and a worped head, when removing head for gasket replacement check head for flatness also preasure test it for cracks and leaks. find cause of over heating replace cap,radiator, thermostate, hoses

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either your R134a is leaked out ore you need add and also add a dye see if leaks.
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1 Answer

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