Question about 1997 Mitsubishi 3000GT

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Blows cool air from air conditioner and engine runs hot

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Do both fans on the inside of the radiator turn on when you have the AC on? It could be that the fan connectors were disconnected. you'll find them tucked away on the side of the radiator.
Is it always just cool air or does it get cold when you are driving? if it's always just cool and never really gets cold then you have either lost your freon or you're AC is not pumping freon. unfortunately you have to take it to an AC specialist to solve that and it's not usually cheap.

Posted on Jun 30, 2009

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Posted on Jan 02, 2017

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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.

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If the fuse is blowing there is too much resistance in the cooling fan moter. Replace JUST the cooling fan motor and the fuse. The A/C always turns the cooling fan ON when turned on. That is why the A/C messes up when the fan motor is bad. Replace the fan motor and the A/C problem will be fixed too. :)

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