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avin
New User
May 24, 2023, 5:20 AM
Post #1 of 6
(1522 views)
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Hello there,
My car AC was shortcycling and then I charged it, before charging low side pressure was hunting and got stable at 30-35psi. After charge the pressure was about 40-45 psi.
However, now the compressor turns on initially for just a sec and then disengages and stays that way.
1. overcharging should have occurred at more than 60psi?
2. are pressure sensors faulty?
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Hammer Time
Ultimate Carjunky
/ Moderator
May 24, 2023, 6:12 AM
Post #2 of 6
(1520 views)
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Re: AC shortcycling
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First, don't ask a question here without posting the year, make, model, and engine size of your vehicle.
People will never learn just how dangerous those DIY charging kits are.
Low refrigerant is not the only cause of short cycling. There are dozens of possible causes and some will do a lot of damage. Overcharging is very dangerous and damaging.
You should NEVER top off a system relying on pressures, especially when you don't even have a high pressure reading. You should never top it off at all.
The system requires a very specific amount of refrigerant to operate correctly and the ONLY way to measure that is by completely evacuating the system and charging with the exact WEIGHED amount of refrigerant. Only then can you look at the high/low pressure readings and come to any conclusion.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on May 24, 2023, 6:13 AM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 24, 2023, 7:08 AM
Post #3 of 6
(1509 views)
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Re: AC shortcycling
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That type of info is all over stuff sold isn't worth crap. As HT said, start from zero, measure in right amount into a well held vacuum. If not that much just wasted time and products.
Always first is WHAT IS THIS THING?
Include why you replaced a compressor as well,
Tom
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 24, 2023, 8:36 AM
Post #5 of 6
(1494 views)
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Re: AC shortcycling
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It didn't, misread 'now' for 'new' doesn't matter for now, T
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Sidom
Veteran
/ Moderator
May 24, 2023, 9:44 AM
Post #6 of 6
(1487 views)
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Re: AC shortcycling
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To properly diag the a/c system you will need a manifold gauge set, a recycler would be good and depending on the year of the car, you may need a scan tool.
Those DIY kits are designed for cars with small leaks. You put the can in and fix the problem (temporarily).
If it doesn't fix the problem then you need to take it to a shop.
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