My wifes mitsubishi galant is having ac issues. The ac works fine in the mornings and at night after it's been sitting in the parking garage in the shade. Problem is at lunch if its parked anywhere not in the shade for 15 minutes or more the ac does not cool, it just blows hot air. Then after work it's fine again because it's been sitting in the shade. Any ideas on why this is?

Theres a TSB for the blend doors on Galants.

english please

In other words, call a Mits dealer ask them if there is an open TECHNICAL SERVICE BULLETIN on your car, they can check with the VIN#.

Come on 1ags don't speak in tongues.

thank you

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english please

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That was english for anyone that knows anything about car maintenance.

While we're talking A/C: My chevy truck's A/C works fine for 30-60 mins or so, then stops blowing. It's still cooling, because I can feel the cool air coming out of the vents, but it seems almost like a baffle has closed, or a blower fan has stopped. If I turn it off for a while, and then back on, it will resume working. Is the fan or a relay overheating somewhere? This happens more often when it is set to recirc. I'm thinking about replacing all the relays in the electric center. i suppose I could test them, but that's a pain in the butt trying to figure out which leads are the power and which are the control.

there was a post just recently about resetting the HVAC controls on those chevy's. don't remember what thread it was on though.

Mouth,

You could be low on freon. When you cool the air, the water comes out and freezes on the coils. Enough air, enough time, enough water and you block the path for air with ice.

Turning it off (or turning it to vent) will speed up the melting of the ice. Best to get some gauges on it and filled up. More than likely a slow leak. This would also mean you are only a small bit low, not a major amount of freon low.

~egon

R134a is refrigerant.

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You could be low on freon. When you cool the air, the water comes out and freezes on the coils. Enough air, enough time, enough water and you block the path for air with ice.

Turning it off (or turning it to vent) will speed up the melting of the ice. Best to get some gauges on it and filled up. More than likely a slow leak. This would also mean you are only a small bit low, not a major amount of freon low.

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Good point. I had forgotten to mention I "fixed" the AC problem I was having while back by bypassing the pressure switch in line with the compressor and adding more Freon, after enduring a couple of years thinking my AC compressor was dead. Once I got off my lazy butt and did a proper diagnosis of the problem, it seems that the switch is bad, and I also have a slow freon leak, maybe. I really need to just take it in and get that fixed and get it tested for leaks.

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I had forgotten to mention I "fixed" the AC problem I was having while back by bypassing the pressure switch in line with the compressor and adding more Freon... it seems that the switch is bad, and I also have a slow freon leak, maybe.

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ACK! Normally that low pressure switch cuts off the compressor when the suction side pressure gets too low. This should happen intermittently even with a proper charge of refrigerant in all but the hottest/humidest conditions. If you're low on freon, and you've bypassed the switch, the compressor will just keep right on running and freeze up the evaporator until it's a giant block of ice, and air can't pass through it. Still feeling cold air at the vents, but the flow gradually slows and stops? Classic symptom of evaporator freeze up.

You need to remedy this quick or you will have a bad compressor very soon. Aside from preventing freeze up when refrigerant levels are low, the low pressure switch is designed to protect the compressor. The refrigerant carries the compressor's oil through the system. When the suction side pressure gets too low, there might not be adequate refrigerant flow to carry oil to the compressor sufficient to keep it lubed. That means the compressor is in danger of starving for oil. A bypassed low pressure switch will make the compressor keep right on running to its early demise.

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That was english for anyone that knows anything about car maintenance.

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Hmmmmmmmmmm don't you think if I knew anything about car maitenance I wouldn't have asked for help..............

I figured it was there for a reason. Time to take it into the shop. That switch doesn't look like something I can replace.