A/C doesn't cycle off
New User
Joined: Jan 2001
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A/C doesn't cycle off
The A/C compressor clutch on my '84 F150 (5.8L) does not cycle (turn off) since a "buddy" recharged the system. The system is a R134a retro. A/C blows as cold as Pluto, but it used to cycle approx every 8 secs prior to recharging. Does this indicate a problem? If so, any ideas? Thanks in advance.
Senior User
Joined: Aug 1999
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A/C doesn't cycle off
[font size="1" color="#FF0000"]LAST EDITED ON 13-Jul-01 AT 02:59 PM (EST)[/font][p]Defintely a problem. The compressor will eventually fry itself.
The most likely culprit is the pressure switch on the line to the evaporator. During a recharge they can get clogged with debris and not switch properly. Did your buddy evacuate and clean the system before recharge? Well, guess what, you get to do it now if you want to replace or clean the switch.
Another possibility is the compressor cannot pump-up the system enough to trigger it off. But you say she is blowing cold, so it is compressing somewhat.
Finally, the debris clogging the switch could be from the compressor rotor/seal deteriorating from using R134a. if this is the case, prepare yourself for some costly replacement parts.
Randy
The most likely culprit is the pressure switch on the line to the evaporator. During a recharge they can get clogged with debris and not switch properly. Did your buddy evacuate and clean the system before recharge? Well, guess what, you get to do it now if you want to replace or clean the switch.
Another possibility is the compressor cannot pump-up the system enough to trigger it off. But you say she is blowing cold, so it is compressing somewhat.
Finally, the debris clogging the switch could be from the compressor rotor/seal deteriorating from using R134a. if this is the case, prepare yourself for some costly replacement parts.
Randy
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