a/c woes
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a/c woes
I have a 98 expy with 110k miles on it. I turned on the a/c last weekend and the air was only coming out of the vents "cool" . Not enough to beat the heat that day. So I popped the hood and checked the freon level and it was at full pressure and the compressor was running fine. When I felt the high pressure hose it was air temp and the return hose was so hot it burned my hand.
Do I have a clog? Or is it time for a new compressor? This truck is going to Florida this summer so I have to get this fixed asap. Thanks
Do I have a clog? Or is it time for a new compressor? This truck is going to Florida this summer so I have to get this fixed asap. Thanks
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Joined: Sep 2011
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I have a 98 expy with 110k miles on it. I turned on the a/c last weekend and the air was only coming out of the vents "cool" . Not enough to beat the heat that day. So I popped the hood and checked the freon level and it was at full pressure and the compressor was running fine. When I felt the high pressure hose it was air temp and the return hose was so hot it burned my hand.
Do I have a clog? Or is it time for a new compressor? This truck is going to Florida this summer so I have to get this fixed asap. Thanks
Do I have a clog? Or is it time for a new compressor? This truck is going to Florida this summer so I have to get this fixed asap. Thanks
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Joined: Mar 2010
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I do not have rear air and the compressor is running normal. The high side pressure was 48 and I barely got a reading on the low side. I do not have a pro type a/c manifold guage setup, I am using a autozone type guage.
Hotshot
Joined: Jan 2004
Posts: 19,760
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From: St Louis
Either the compressor isn't "running fine" or your gauges are defective. Normal range readings should be 25-45 psi on the low side and 200-350 on the high side, depending on a variety of conditions.
Do NOT screw with touching the hoses coming off the compressor - you'll burn your fingers. Check the inlet and outlet hoses at the evaporator. The inlet hose should be very cold (30-40F). If the system is properly charged, the outlet line should be nearly the same temp. If the inlet is cold but the outlet is too warm, the system is undercharged and cooling performance will be poor.
You can tell that without any valid pressure readings based only on a sketchy description????? If the FOT were restricted or clogged, the compressor would be short-cycling.
Do NOT screw with touching the hoses coming off the compressor - you'll burn your fingers. Check the inlet and outlet hoses at the evaporator. The inlet hose should be very cold (30-40F). If the system is properly charged, the outlet line should be nearly the same temp. If the inlet is cold but the outlet is too warm, the system is undercharged and cooling performance will be poor.
Your orifice tube is plugged.
Junior User
Joined: Sep 2011
Posts: 86
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Either the compressor isn't "running fine" or your gauges are defective. Normal range readings should be 25-45 psi on the low side and 200-350 on the high side, depending on a variety of conditions.
Do NOT screw with touching the hoses coming off the compressor - you'll burn your fingers. Check the inlet and outlet hoses at the evaporator. The inlet hose should be very cold (30-40F). If the system is properly charged, the outlet line should be nearly the same temp. If the inlet is cold but the outlet is too warm, the system is undercharged and cooling performance will be poor.
You can tell that without any valid pressure readings based only on a sketchy description????? If the FOT were restricted or clogged, the compressor would be short-cycling.
Do NOT screw with touching the hoses coming off the compressor - you'll burn your fingers. Check the inlet and outlet hoses at the evaporator. The inlet hose should be very cold (30-40F). If the system is properly charged, the outlet line should be nearly the same temp. If the inlet is cold but the outlet is too warm, the system is undercharged and cooling performance will be poor.
You can tell that without any valid pressure readings based only on a sketchy description????? If the FOT were restricted or clogged, the compressor would be short-cycling.
OP, find the orifice tube and see if the hose is hotter on one side of it than the other. I'd also find someone with a gauge manifold to see what the true readings are. Plus you will be able to see when the compressor is cycling and at what pressure.
If the system is low add some dye and refill. When it starts to blow warm again get out your black light and start looking for the leak.
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