Ok it’s hot as $...! Help with cool?
#21
#22
Earlier cars had a superheat switch, later ones had a pressure switch. If the freon pressure was low the pressure switch would prevent the clutch from engaging to preserve the compressor. The superheat switch melted if the freon temperature got high from low freon. It doesn't work as well as a pressure switch and has to be replaced if it trips. A pressure switch doesn't need to be replaced. If a compressor fails and seizes, then there are bits of metal spread throughout the entire AC system. Basically you have to replace everything the freon touched at that point. A very major and expensive job.
#23
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Here's a pic of the 3-prong 'thermal limiter' fuse as used with the 'superheat switch' systems. If you have one it'll be attached to the compressor bracket.....or sometimes dangling by the wires nearby.
Systems using the HSLP switch----High Side, Low Pressure.---- did not have the thermal limiter fuse.
As far as I know none of the Jags with the Mark III climate control used the thermal limiter fuse....but I can't swear to it.
Cheers
DD
#24
Here's a pic of the 3-prong 'thermal limiter' fuse as used with the 'superheat switch' systems. If you have one it'll be attached to the compressor bracket.....or sometimes dangling by the wires nearby.
Systems using the HSLP switch----High Side, Low Pressure.---- did not have the thermal limiter fuse.
As far as I know none of the Jags with the Mark III climate control used the thermal limiter fuse....but I can't swear to it.
Cheers
DD
Systems using the HSLP switch----High Side, Low Pressure.---- did not have the thermal limiter fuse.
As far as I know none of the Jags with the Mark III climate control used the thermal limiter fuse....but I can't swear to it.
Cheers
DD
#26
#27
yeah R12 isn’t a good long term solution anyway as it’s getting rarer and rarer. I know the r12 disappeared from mine but the car sat in a barn for like 8yrs. I imagine no matter what the car and system a gas would eventually escape or evaporate?
#28
#29
#30
I'm not sure about the oil. The XJR I had was factory fill with R134.
You'd have to completely take apart the system and flush each component to change the oil, it's a difficult task. You should be able to simple put on the adapter ports and change with R134 and you're good to go. Assuming they system is actually leak free. You'll need the good vac pump and proper gauge manifold to know that.
I would get a real vacuum pump, not an air one like that. You'd need a very large compressor to run that and I hear they are not very good at generating a deep vacuum.
You'd have to completely take apart the system and flush each component to change the oil, it's a difficult task. You should be able to simple put on the adapter ports and change with R134 and you're good to go. Assuming they system is actually leak free. You'll need the good vac pump and proper gauge manifold to know that.
I would get a real vacuum pump, not an air one like that. You'd need a very large compressor to run that and I hear they are not very good at generating a deep vacuum.
#31
I'm not sure about the oil. The XJR I had was factory fill with R134.
You'd have to completely take apart the system and flush each component to change the oil, it's a difficult task. You should be able to simple put on the adapter ports and change with R134 and you're good to go. Assuming they system is actually leak free. You'll need the good vac pump and proper gauge manifold to know that.
I would get a real vacuum pump, not an air one like that. You'd need a very large compressor to run that and I hear they are not very good at generating a deep vacuum.
You'd have to completely take apart the system and flush each component to change the oil, it's a difficult task. You should be able to simple put on the adapter ports and change with R134 and you're good to go. Assuming they system is actually leak free. You'll need the good vac pump and proper gauge manifold to know that.
I would get a real vacuum pump, not an air one like that. You'd need a very large compressor to run that and I hear they are not very good at generating a deep vacuum.
#32
BTW, venting any remaining R12 into the atmosphere is illegal, not to mention irresponsible. It's supposed to be collected. If you don't have the equipment to do it, take it to someone who does.
A cheap vacuum pump is not a collection system.
If you must have something R12 compatible, look at Freeze 12, which is at least less damaging to the ozone layer.
A cheap vacuum pump is not a collection system.
If you must have something R12 compatible, look at Freeze 12, which is at least less damaging to the ozone layer.
Last edited by Mark SF; 07-21-2018 at 10:55 AM.
#33
BTW, venting any remaining R12 into the atmosphere is illegal, not to mention irresponsible. It's supposed to be collected. If you don't have the equipment to do it, take it to someone who does.
A cheap vacuum pump is not a collection system.
If you must have something R12 compatible, look at Freeze 12, which is at least less damaging to the ozone layer.
A cheap vacuum pump is not a collection system.
If you must have something R12 compatible, look at Freeze 12, which is at least less damaging to the ozone layer.
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