A/C Cycling....Too Often ???
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Laughing Gas
Joined: Nov 2006
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A/C Cycling....Too Often ???
Turned the A/C on in my 84 351W yesterday..(Finally Warm Enough)...Seemed that the Compressor was kicking on amd off about every 10-15 seconds. I say compressor because the noise sounds like maybe the clutch on the compressor is doing it. Should I notice this...?...Suggestions before it goes to the dealer. I am clueless about A/C problems...Thanks..Jv
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Joined: Jul 2003
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From: petersburg
i belive that the freon charge is low. youll need to check the pressure in the systm to be sure witch sorry to say is a dealer thing unless you already have converted your truck to the 134-a system then you could pick up a pressure gauge at any autoparts store. if your still on the old r-12 you cant service it without a liscense
Give me coffee - Or beer!
Joined: Aug 2003
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From: Who cares?
Changing to R-134 is a breaze. You should find a vaccuum pump though to pull a vaccuum on your system. I did mine in a few hours. Most of the time was waiting for the vaccuum. You must pour out the oil in your compressor and replace it with the correct oil. Cleaning it is advised to remove all the old freon and oil. I had heard all kinds of stories about the two chemicals mixing and eating away the system. I forgot what I used to clean it out, but it was readily available. When you switch it over you have to blow everything out and clean it thouroughly. The kits are available at the auto parts stores. You will change the orifice when reassembling the system. The kit came with o rings and seals. Mine worked for 5 years until the engine caught fire (mechanic horor story). My compressor didn't rot away and the system worked great. The clutch is also easy to change if it needs it. You will probably have to borrow the tool from autozone, but it takes no time at all.
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From: Virginia
Originally Posted by ozark1
Turned the A/C on in my 84 351W yesterday..(Finally Warm Enough)...Seemed that the Compressor was kicking on amd off about every 10-15 seconds. I say compressor because the noise sounds like maybe the clutch on the compressor is doing it. Should I notice this...?...Suggestions before it goes to the dealer. I am clueless about A/C problems...Thanks..Jv
It is true, low amounts of freon will make the clutch cycle too much. But also, if it was not a very warm day, and you did not have the interior fan on a very fast speed setting, the coil can cool quickly and trip the low pressure switch more often.
If it was cooling fine, I would wait till a hotter day and see if it still works ok. If it wasn't cooling very good, then it probably does need a little bit of freon.
Post Fiend
Joined: Oct 2003
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From: Western Central NV
I agree most likely it needs to be charged. If it has not been converted it may be hard to get someone to work on it. Also the other thing that will cause short cycling is the low pressure switch being bad. I had to replace mine this last year for doing the same thing. I have an ASE Cert. for A/Cs, and an EPA Type I & II high pressure Cert. Don't get caught bleeding R-12 into the atmosphere. It is a $25,000 FINE. Having one converted is about $400. Getting it done right will be cheaper in the long run. The system should be flushed before adding new oil. Ester is the preferred oil. It mixes with other oils better. All o-rings need to be changed to handle 134A. If you have any leaks 134A will leak out faster than R-12.
My guess is if you are low on freon it is leaking from the COMPRESSOR SEAL. They will leak over time some so you need to determine that.
My guess is if you are low on freon it is leaking from the COMPRESSOR SEAL. They will leak over time some so you need to determine that.
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Laughing Gas
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Cross-Country
Joined: Dec 2006
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From: Prairie Village, KS
I top mine off with propane...works great.... there are also many r-12 replacement "drop-in" refrigerents you can by ....check WW Grainger site or other refrig. suppliers.
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From: Niceville, FL.
Once you contaminate your R-12 svstem with a "drop-in" replacement refrigerant, good luck finding a shop that will work on it for you. They have sensors that are very good at detecting contimanents. They definately don't want to contimanate their recovery equipment. Right, Kermmydog?
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Laughing Gas
Joined: Nov 2006
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Took it to my local shop..Was low on gas. He changed fittings and put in R-134. I asked about seals, etc needing changed. He said it does not need all the changes. I trust his work...so we will see..Thanks again..jV
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