My Dash air hasn't been very cold lately so I tried servicing it with 134a freon that I bought at Walmart with gage. The initial pressure reading was below 10 psi at 75* ambient. The gage says I should see between 35-45psi. I put in one 12oz can of leak stop freon and several 12oz cans of 134a freon. When the gage got up to about 35 psi, the compressor clutch would intermittently stop and start and would sometimes make a screeching noise like metal on metal for a couple of seconds or so, while turning slow, then turn off/on, for a few times, then start turning at regular speed. Then start this process all over again. I thought maybe there was too much pressure or something, (inaccurate gage?) so I released the pressure down to 25 psi and the compressor clutch stopped doing this and the dash air is now cold. Does anyone know if too much pressure can cause the compressor to do this? Thanks for any suggestions.
Larry, 03 Allure 30856