gauge readings

[penguins25]

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

[bohica2xo]

What exactly is an "mgm"?

It sounds like a coupler malfunction. Low side.

[penguins25]

mercury grand marquis

[penguins25]

whats a coupler?

[Dougflas]

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

[Cusser]

my ac in my 08 mgm doesnt work on normal ac

What exactly is an "mgm"?

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

[penguins25]

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

[penguins25]

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

[Dougflas]

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?

[penguins25]

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