missing and a/c quits

Circadian

Newbie
Joined
May 19, 2024
Messages
1
Points
1
Make
Mercury
Model
Grand Marquis
Year
1981
Miles
160000
Engine
4.6
It runs rough intermittent and when it does the a/c quits working. The fan blows but no cooling. Any help is appreciated.
 

billr

wrench
Staff member
Joined
Mar 12, 2007
Messages
7,971
Points
63
Please, let's get started off with the understanding that typos will cripple (even kill) any attempt we make to help you. Proof-read your posts as much as necessary to avoid typos.

That said, the 4.6L "modular" V-8 was not introduced until 1991. What are we really working with here?

I would focus first on the intermittent rough/poor running of the engine. The root cause of that may be also affecting the A/C.

Is this vehicle "new" to you, or has been running OK for you previously and these are new problems that popped-up?

Will trouble-shooting and repairing this be a DIY project, or are you looking for some background info as you take it to a shop?

With any engine problem, there are some basic tests/checks that should be done: pull sparkplugs for inspection and taking compression, check fuel pressure, check for intake/exhaust restriction, check system voltage, check for vacuum leaks, check EGR system, etc.
 
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