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Re: AC acting weird...
Need to diagnose this with manifold guages attached to system and an experienced tech at the helm. Pressure relief valves seldom fail and they're set to relieve press in excess of 400psi. The fan keeps the head pressure down and you say it's working. But is it turning on and off at the right pressures? Another possibility is a restriction in the system most likely the condenser. Hondas were well known for this. GM's not so much unless an improper compressor/ component change was done in the past.
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