Mark Parks
Member
- Joined
- Nov 28, 2008
- Messages
- 533
I had my 86 GN evacuated and had 134A installed. It blows cold BUT recycles continously. I changed the recycle switch but no help.Any ideas??
By registering with us, you'll be able to discuss, share and private message with other members of our community.
SignUp Now!Any other thoughts as to why the AC recycles continually?
its a ccot system cycling clutch orifice tube its supposed to cycle but anything thats bothering you is probally to fast. low charge is # 1 culprit but, could have a restriction somwhere usually at orifice tube or reciever drier. if 2 much oil was added this can cause a restriction in the orifice tube. also it could be over charged and triping the high pressure switch. very hard to diag without pressure readings. without pressure readings your basicly just guessing
first of all i don't know what you mean by recycle. 2nd yes a restriction can still let the a/c blow cold thats what an orifice tube is its a restriction, but if to much oil or foreign debris is in the orifice tube it will cause a greater restriction can still blow some what cold but can cause low side pressures to get 2 low. you need to know your pressures if you don't we can not diag the system we can guess all day but without pressures or even temps we know nothing. are any of the lines icing up while system is runing
You don't use the same amount of 134 as you do r12. I think you only use like %90 of the specified amount of r12.
ex:3.25lbs (the amount specified for r12) x.9= 2.925 lbs r134a
ok the low side if you have the r12 factory cycling switch (one on the drier accumulator) shoud cycle the clutch off at somewhere between 21 and 24 psi and on at around 44 psi. on the other hand if your overcharged the high pressure switch (sensor on discharge line of compressor right by compressor) i believe will kick compressor off around 280 psi. if your lost and want a complete explanation of how our ac sys works let me know i will try to explain as simple and short as i can. sorry for slow reply working nights this week
im sure it is simple but without knowing the pressure you don't know if its an overcharge undercharge or a blockage. when you run it does any of the lines after the evaporator ice up quickly?? does your accumulator drier ice up?