1996 Honda Civic Air Conditioner

Tpok my Honda in, had expansion valve replaced. Vehicle cools if driving on freeway. In town, stop and go, or stop at a drive-thru and the air starts
blowing warmer. Never blows under 60 degree air. Repair shop is stumped. Blower motor, fan, and relay switch working. Any ideas??
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Well, if your model SHOULD blow colder, then there's a problem. A/C systems are not that complicated.
The gas is compressed to a high pressure, heating it. It then passes through the condensor (front rad) to cool it down, then flows to the evaporator in the cabin, where the size of the pipes get larger. This reduces the pressure, resulting in a decrease in temperature, hence air blown through the evaporator is cooled. Then the gas circulates back to the compressor.
OK. If your shop has measured the high and low pressure sides and found them correct, and the system won't blow colder than 60, then I'd suggest the following. a) have the dual pressure switch checked. This is a switch that shuts down the a/c if the gas pressure gets too low or too high. In town, the engine runs hotter, and the a/c will start and stop to protect itself. b) I'd also see if the condensor is covered in dirt and bugs. A good water pressure clean can do wonders. Also, verify that the a/c fan is in fact sucking air through the condensor, not trying to blow it forewards. Is anything blocking air flow? c) is the compressor clutch kicking in properly? Are you sure? Is the compresser clutch slipping? d) is anything blocking the air flow through the evaporator?
Stewart DIBBS
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wrote:

bad condenser fan motor. Chip
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OK, repair shop went through compressor and replaced expansion valve a second time. Replaced condenser---still blows 50 degrees on the freeway, but stop at signals and it starts blowing hot air...get on freeway, cold again, stop and go..hot air. Any other ideas??
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When you are speeding along the freeway, the car's natural forward motion is enough to drive air through the condenser coil to cool it off. When you are stopped or going slow, the air conditioner relies on the radiator's FAN to drive the air through. Apparently, the fan is not working. The fix MIGHT be as simple as replacing the fan's fuse, if the fuse had blown.
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No luck there. Shop just replaced the condenser, rebuilt the compressor and expansion valve. We are really STUMPED now! Anyone have any other ideas? There are only so many parts to the system!
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