Driving down the road sometimes it works perfect, sometimes it will only pull the temp down to 5-8 degrees below ambient temp, and doesn't do a good job at pulling the humidity out of the air.
Sitting still, I will stay nice and comfortable. But, this afternoon it was in the upper 80's, I put a produce thermometer in the vent and watched the temp. It would normally stay at 57 degrees, once in a while it would run up to 65 degrees, and sometimes it would pull down to 40 degrees. All these temps were with the temp selector on the dash in the same position, water temp was constant thru out.
For whatever reason, it seems to be worse at highway speeds, with the engine fan on, or heading into a headwind.
I have checked every electrical connection for the system under the hood, everything there seems to be kosher.
Thoughts?
AC system is acting up
Discussion in 'Trucks [ Eighteen Wheelers ]' started by Oscar the KW, Aug 17, 2014.
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I have the same problem. I stop and turn truck off, then back on it works fine. The problem comes and goes, it doesn't happen all the time
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Do you have a sight glass in the drier? They are usually right in the top of the drier, most of the time they still have the masking tape covering the glass from when the drier was painted at the factory. It kinda sounds like low freon level but putting a can in can be the wrong thing to do if it isn't low. If you have the sight glass if its real foamy then its low. If its mostly clear with a few bubbles then its ok.
Oscar the KW Thanks this. -
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Hook a gauge up to the ac and make sure it's charged. I had to throw a can in mine this year and it's been cool since.
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Since the sight glass is mostly clear, I would say freon is ok. If your drier has the stem on it with the color stem (looks kinda like a sight glass) blue is ok white is bad. It kinda sounds like there is blockage between the condenser and evap core. Since your system hasn't been open that points to maybe the drier is stopped up or the expansion valve or orafice tube is stopped up depending on what you have. What the blockage does is cause the low side to actually pull into a vacuum as air runs across the condenser to lower what should be rising pressure from freon chaning from liquid to gas. The low side falling that quick is what kicks the clutch out due to low pressure switch. It may be best to get it checked ASAP as when a compressor comes apart it can be a nightmare afterward. Again I can't be sure without seeing touching and feeling but its just what it sounds like.
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