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Tandorvir

Tandorvir 7/22/2018

1989 Honda Civic DX 4 Cyl 1.50L

Body & Interior

A/C refrigerant pressure drops to 0 when turned on

Air conditioning hasn't worked since I got the car, finally decided to recharge. After recharging, I detected no change (after several days). I found that the refrigerant pressure was normal until the AC was turned on, at which point it dropped to 0. When turned off, it returned to normal. The "off" pressure hasn't changed over several days, so it doesn't seem like a leak. Any ideas on what the problem could be and what might help?

1 Answer


Teddy B

Teddy B 7/23/2018

First --- any vehicle up to 1992 would have R12 Refrigerant in the system.

That product is no longer avail & has not been, without an EPA 609 Licence,
SO -- What is in the system now ?

Has it been converted to R134a ?

Either way you need a pressure temp chart, to monitor the Low Side Gauge & 30# was about all R12 should
go down to & I think around 40# for R134a. Those numbers can be found & checked out.

The problem:
May be low on Refrigerant
May have air in the system
May also have a system leak-- to be found & repaired.

The off pressure,as you call it,is the refrigerants characteristic or static pressure when under
pressure & not being pressurized.

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