s5 vert problem with a/c
04-29-07, 02:51 PM
#1
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s5 vert problem with a/c
Ok my a/c works fine mostly but it doesn't alway throw out cold air. I noticed that it's because of the "ac" button the light turns on and off when it wants to and when its on it throws it out cold if its off then it's hot. Is this a common problem, and if so how can I fix it?
04-29-07, 07:19 PM
#2
You probably have a short somewhere. Most likely place is the logicon.
Before you buy a replacement, check for low freon.
Besides a short, it could be low gas. The pressure switch turns the compressor off when the low side gets too low. If your pressure was out of spec, the switch would cut out the compressor. This scenario usually lasts for a matter of seconds, the pressure moves back into the correct range and the compressor restarts. If however you have really low freon, then on warm days, the system will never really stay in the correct range and the air from the vents be warm. On a slightly cooler day, the pressures will stay in the correct range because the load on the system is lower. Now the system will blow cold air from the vents.
You would start out by checking the vent temperatures when idling, then with the engine running at 2500 rpm, inside fan on high, top up with recirculation on.
On an 85* or so day the car should be able to blow 50* or so air. At 2500, it should be colder and will occasionally have the compressor cut out. This is correct operation.
If the compressor cuts out frequently under the above conditions, it is low on freon. If it doesn't reach those temps, it is likely low on freon.
If it has been converted to R134A, it will never work as intended and all bets are off. If converted to 134A, it should also have a high-pressure switch retrofitted, at minimum.
Good luck.
Before you buy a replacement, check for low freon.
Besides a short, it could be low gas. The pressure switch turns the compressor off when the low side gets too low. If your pressure was out of spec, the switch would cut out the compressor. This scenario usually lasts for a matter of seconds, the pressure moves back into the correct range and the compressor restarts. If however you have really low freon, then on warm days, the system will never really stay in the correct range and the air from the vents be warm. On a slightly cooler day, the pressures will stay in the correct range because the load on the system is lower. Now the system will blow cold air from the vents.
You would start out by checking the vent temperatures when idling, then with the engine running at 2500 rpm, inside fan on high, top up with recirculation on.
On an 85* or so day the car should be able to blow 50* or so air. At 2500, it should be colder and will occasionally have the compressor cut out. This is correct operation.
If the compressor cuts out frequently under the above conditions, it is low on freon. If it doesn't reach those temps, it is likely low on freon.
If it has been converted to R134A, it will never work as intended and all bets are off. If converted to 134A, it should also have a high-pressure switch retrofitted, at minimum.
Good luck.
04-29-07, 08:52 PM
#3
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Location: oak park MI
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why are you useing a/c on a vert. your car is the biggest a/c on the planet and yet you keep the top up. I dislike people that buy a vert and use the a/c why spend the extra money to buy a vert if the dont use it for what it was built for, top down crusing. but that is my 2 cents worth but I whould check the freon level first.
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