GM Forum - Buick, Cadillac, Olds, GMC & Pontiac chat - AC Low Pressure Service Port 2001 Bonneville

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Quote:

Originally Posted by Foo2U2001 (Post 1535886)

Why is that?

Jeff

because when you get blockage in the evap technically your temps should go down, sometimes on residential units to the point of freezing, the condenser on the other hand if its blocked you have a lack of cooling temps(higher) and capacity

which one is it?

Quote:

Originally Posted by WMichBonne (Post 1535388)

With all the hot weather we've been having lately, I'm thinking my AC isn't working as well as it used to. Being a 2001 with over 200k, I can imaging that the R134a is lower than what it was from the factory. So I'd like to check the R134a pressures to see if it is low or if it is old-timers kicking in.

I was able to get a set of gauges and have located the high pressure service port on the right front corner. However, where is the low pressure port? I've traced both hoses from the compressor all the way to the firewall and I only see 2 ports, both on the same hose (see attached). One has interior threads and is on the expected high pressure fitting.

I also have been reading in another thread that the Bonne's have a higher pressure than some of its counterparts. Does anyone have the temperature/pressure chart that covers the 2001?

Thanks for setting me straight.

so which one is the low service port. the one on the right or left?

It should be the one marked with a 'L', and be the smaller of the two. It could also be blue. If memory serves, the one closest to the firewall is it.