Ac compressor
#1
05-08-2015
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Location: Florida
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#2
05-09-2015
Reads like one of the 2 pressure switches is shutting off compressor voltage.
This can be because system needs a recharge of refrigerant(low pressure) OR, it could be the Condenser in front of the radiator isn't cooling as it should(high pressure).
Compressor pulls in refrigerant from the low side, if there isn't enough then pressure gets too low.
Compressing refrigerant heats it up, and of course, increases it's pressure, condenser cools it which reduces the pressure on the high pressure side.
Check condenser, make sure it is clean, cooling fins can get clogged with road debris.
If it has an electric fan make sure it is coming on, if it isn't being cooled then pressure stays too high.
There are several DIYs on the internet on how to recharge A/C systems, watch the videos and read the info, then decide if it is something you should try, I take mine to a shop, lol.
And as always it might not be either of the above, diagnosing any problem remotely is a guess.
This can be because system needs a recharge of refrigerant(low pressure) OR, it could be the Condenser in front of the radiator isn't cooling as it should(high pressure).
Compressor pulls in refrigerant from the low side, if there isn't enough then pressure gets too low.
Compressing refrigerant heats it up, and of course, increases it's pressure, condenser cools it which reduces the pressure on the high pressure side.
Check condenser, make sure it is clean, cooling fins can get clogged with road debris.
If it has an electric fan make sure it is coming on, if it isn't being cooled then pressure stays too high.
There are several DIYs on the internet on how to recharge A/C systems, watch the videos and read the info, then decide if it is something you should try, I take mine to a shop, lol.
And as always it might not be either of the above, diagnosing any problem remotely is a guess.
Last edited by RonD; 05-09-2015 at 09:40 AM.
#3
05-09-2015
Join Date: May 2015
Location: Florida
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#4
05-09-2015
Google: Ford A/C air gap
The coil in the compressor generates a magnetic field when it is given power, this pulls the clutch plate in which engages the compressor, if the "air gap" between the coil and plate changes then it can not hold plate consistently.
But usually this happens fairly quick, and you wouldn't have to wait 5 minutes.
There are 2 wires on the compressor, 1 is a ground the other has 12volts when A/C is on.
Put a test light or volt meter on the 12volt wire and start engine then turn on A/C .
If voltage goes off with compressor then issue is with the switches or control, if voltage stays on but compressor disengages then problem is in the field coil or air gap.
The coil in the compressor generates a magnetic field when it is given power, this pulls the clutch plate in which engages the compressor, if the "air gap" between the coil and plate changes then it can not hold plate consistently.
But usually this happens fairly quick, and you wouldn't have to wait 5 minutes.
There are 2 wires on the compressor, 1 is a ground the other has 12volts when A/C is on.
Put a test light or volt meter on the 12volt wire and start engine then turn on A/C .
If voltage goes off with compressor then issue is with the switches or control, if voltage stays on but compressor disengages then problem is in the field coil or air gap.
Last edited by RonD; 05-09-2015 at 11:05 PM.
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