Help with air conditioning
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Junior User
Joined: Nov 2006
Posts: 82
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From: Dayton, Ohio
Help with air conditioning
It's been a while since I've been around, out playing with the toys. I came across a problem with my air conditioning yesterday that I just don't get. My truck, while sitting still at idle, has real nice cold air blowing but when I drive the truck it starts blowing warm air. In my limited experience this is bass-akwards from what I would expect.
I have a '53 with a tuned port 350 and a Vintage Air system with the Vintage Air polished compressor.
Any help would be appreciated...
Mark
I have a '53 with a tuned port 350 and a Vintage Air system with the Vintage Air polished compressor.
Any help would be appreciated...
Mark
Senior User
Joined: Jun 2011
Posts: 195
Likes: 0
From: Fresno, California
Check your compressor belt tension and the clutch plate tension.
Are you running an electric fan? Is the compressor wired through the fan? I've seen situations where the compressor was wired through the fan, and would only run when the fan was on, as in a modern car. The problem with this is, if the fan is wired through a temperature regulated switch, when the engine reaches the set temp, the fan kicks off, shutting off the compressor.
If that's not it, then put some gauges on it and check for off idle restrictions in the system. A plugged orifice tube, expansion valve or receiver/dryer may be the culprit.
Are you running an electric fan? Is the compressor wired through the fan? I've seen situations where the compressor was wired through the fan, and would only run when the fan was on, as in a modern car. The problem with this is, if the fan is wired through a temperature regulated switch, when the engine reaches the set temp, the fan kicks off, shutting off the compressor.
If that's not it, then put some gauges on it and check for off idle restrictions in the system. A plugged orifice tube, expansion valve or receiver/dryer may be the culprit.
Fleet Owner
Joined: Jul 2004
Posts: 27,300
Likes: 1,059
From: NM
Does the system include a switch to turn off the compressor on low vacuum or WOT? These are sometimes there to kill the compressor when you need max power, but if misadjusted or malfunctioning, could be killing the compressor at moderate loads.
Is this a new condition, or is this your first operation of the system?
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Junior User
Joined: Nov 2006
Posts: 82
Likes: 0
From: Dayton, Ohio
Giesterfarher™ Check your compressor belt tension and the clutch plate tension.
Are you running an electric fan? Is the compressor wired through the fan? I've seen situations where the compressor was wired through the fan, and would only run when the fan was on, as in a modern car. The problem with this is, if the fan is wired through a temperature regulated switch, when the engine reaches the set temp, the fan kicks off, shutting off the compressor.
If that's not it, then put some gauges on it and check for off idle restrictions in the system. A plugged orifice tube, expansion valve or receiver/dryer may be the culprit.
Giesterfarher- With the Tuned Port I am running a serpentine belt and the tension appears to be fine. I do have an electric fan hooked up and I am not sure at this point if the compressor is wired through it...I will check. The system itself was brand new from Vintage air.
ALBUQ F-1 Does the system include a switch to turn off the compressor on low vacuum or WOT? These are sometimes there to kill the compressor when you need max power, but if misadjusted or malfunctioning, could be killing the compressor at moderate loads.
Is this a new condition, or is this your first operation of the system?
ALBUQ F-1 - I believe the system would have the WOT valve and not the vacuum. and yes the system was brand new from Vintage Air
Are you running an electric fan? Is the compressor wired through the fan? I've seen situations where the compressor was wired through the fan, and would only run when the fan was on, as in a modern car. The problem with this is, if the fan is wired through a temperature regulated switch, when the engine reaches the set temp, the fan kicks off, shutting off the compressor.
If that's not it, then put some gauges on it and check for off idle restrictions in the system. A plugged orifice tube, expansion valve or receiver/dryer may be the culprit.
Giesterfarher- With the Tuned Port I am running a serpentine belt and the tension appears to be fine. I do have an electric fan hooked up and I am not sure at this point if the compressor is wired through it...I will check. The system itself was brand new from Vintage air.
ALBUQ F-1 Does the system include a switch to turn off the compressor on low vacuum or WOT? These are sometimes there to kill the compressor when you need max power, but if misadjusted or malfunctioning, could be killing the compressor at moderate loads.
Is this a new condition, or is this your first operation of the system?
ALBUQ F-1 - I believe the system would have the WOT valve and not the vacuum. and yes the system was brand new from Vintage Air
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FTE Legend
Joined: Oct 2005
Posts: 283,939
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From: northwestern Ontario
Vintage Air has a pretty good tech line and seeing as it's thier system I'm sure they would give you the right answers.
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Joined: Mar 2005
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From: peyton, colorado
Check your heater valve. I read a post years ago where the heater valve was installed backwards, the flow going the wrong direction. With a little rpm, the water pump was able to push the valve open, sending hot water to the heater. Also, make sure the valve is in the correct hose. The pressure side, not the return side.
Fleet Mechanic
Joined: Sep 2002
Posts: 1,622
Likes: 3
From: okla
Check your heater valve. I read a post years ago where the heater valve was installed backwards, the flow going the wrong direction. With a little rpm, the water pump was able to push the valve open, sending hot water to the heater. Also, make sure the valve is in the correct hose. The pressure side, not the return side.
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