Engine Size: 1.9 M42
Refrigerant Type: R134a
Country of Origin: United States
Replaced the compressor and ready to refill with R134a. When I hook up the vacuum pump I get the following:
1. If gauge valves are open and high and low valves closed, the pump is quiet and gauges bottom out and hold
2. With low side closed, if I open the high side valve, the pump gurgles and there is a hiss near the firewall/low connector
3. With high side closed, if I open the low side valve, the pump gurgles and there is a hiss near the firewall/low connector
If just one side was doing it I would wonder if I had a bad o-ring or a bad low connector. With this situation, I need some help.
It's leaking there. When you open either valve it pulls air out of the lines in the car all the way around.
Why would both lines leak? Coincidence? Or if there is a leak in one would it show up when pumping the opposite side also?
Is there any way to see if it is the gauge fitting/valve rather than the car?
Adding pressure to the gauge set might provide the answer.
How does the evaporator work related to this? When just one side (either high or low) is under vacuum I can hear a hiss at the firewall. If I open both high and low the sound of the hiss doubles. I've removed the connections, reset the o-rings and made sure everything was tight and it's still doing this. What next?
Considering you have an expansion block on this system. Might check for a leak there. Hissing noise is most likely a leak of some sort.
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