We are having problems with the ac in my wifes 300D, The ac has been working fine for 2 years. Lately it has not cooling very well, so I thought it might be low on freon so I hooked a gauge up to the low side and it was way over 100 psi. That is way past the red danger zone on this gauge, what do you think I should do? Any ideas, thanks. That was with the car off, does it matter if the car was off?

Come on guys, somebody has to have an idea what to do.

Yes, the compressor must be running to get meaningful readings. When the compressor is off, the pressures in the system will equalize throughout.

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1987 W201 190D

Was that fast enough for you?

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1987 W201 190D

Thankyou, and yes that was fast. I will check it again tomorrow.

I could not wait, went out and checked the low side and it was low. So I put one can of 134 in and it feels better, thanks.