Automotive Air Conditioning Information Forum

my ac in my 08 mgm doesnt work on normal ac
it does work somewhat on max ac

i put my guages on it and this is the readings
low side read 125 constant
high side was going from 200 to 300 cycling

What exactly is an "mgm"?

It sounds like a coupler malfunction. Low side.

mercury grand marquis

whats a coupler?

The low side fitting on the hose does not sound as if it has the proper connection.

penguins25 wrote:my ac in my 08 mgm doesnt work on normal ac

bohica2xo wrote:What exactly is an "mgm"?

Penguins, you assumed we would know what "mgm" means????

please help yall
i really want to fix my ac and dont know where else to go

just went out there and put the gauges on and here is what i got
low side 75-150
high side 300-500

both sides cycle back and forth through them numbers

my ac blows cool not cold

edit:
these readings were taken on max ac
theres a normal ac setting i can put it on but the ac doesnt blow as cool on this setting
i can go take anorther reading on normal if this would be helpful

Readings are too high. Spray the condenser with a water hose while monitoring the high side pressure. Does it drop like a rock? If so, start by checking airflow across condenser. Check the cooling fan also. If the high side drops, does the low side drop also?

i put the gauges on and got the water hose

its doing the exact same thing as before its going back and forth between
low side 75-150
high side 300-500
the water on the condenser does not drop the readings