1993 suburban retrofit r134a pressures
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CF Active Member
Joined: Jul 2018
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1993 suburban retrofit r134a pressures
Hi,
I have a 1993 suburban c1500 with front & rear a/c. It was changed to r143a years ago at some shop. Same compressor, just different pressure cutoff switch, I think. I’m bringing it back to life and a/c amazingly still seems to work! Just low on freon. I added 3 cans and rear is cooling well, front not as well. I can’t find info on what the high/low side pressures @ what rpm & temp as it was oringinally a r12 system. Any help would be appreciated. Thanks!
I have a 1993 suburban c1500 with front & rear a/c. It was changed to r143a years ago at some shop. Same compressor, just different pressure cutoff switch, I think. I’m bringing it back to life and a/c amazingly still seems to work! Just low on freon. I added 3 cans and rear is cooling well, front not as well. I can’t find info on what the high/low side pressures @ what rpm & temp as it was oringinally a r12 system. Any help would be appreciated. Thanks!
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Joined: Apr 2006
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From: KC, MO area
Welcome to the forum.
If you don't have the R134a tables, a good rule of thumb is for the high pressure to be 2.2 to 2.5 times the ambient temperature. The low pressure should be in the 25 psi to 45 psi range.
If you don't have the R134a tables, a good rule of thumb is for the high pressure to be 2.2 to 2.5 times the ambient temperature. The low pressure should be in the 25 psi to 45 psi range.
Thread Starter
CF Active Member
Joined: Jul 2018
Posts: 134
Likes: 12
Thanks! Appreciate the advice.
my apologies, I didn’t mean to post in DIY thread. I don’t see how to delete so if moderator would like to remove, thanks.
my apologies, I didn’t mean to post in DIY thread. I don’t see how to delete so if moderator would like to remove, thanks.
Last edited by Sabino56; Jul 21, 2018 at 9:54 AM.