Probably a good idea. Also check for leaks. Trouble spots are:
High pressure line from condenser to receiver/dryer -- this is the
first hose to go bad
O-rings between compressor and mainfold on top of it, high pressure
O-rings between hose manifold and compressor manifold, ditto
Expansion valve o-rings.
Occasionally you will find other o-rings in the system leaking, most
are fairly easy to replace.
Obviously a bad evaporator will not only fail to cool but will let air
in -- I have one in the garage I will install in the diesel when I get
some time off and feel like it.
And I have had a hole appear in a condenser, too, on the wagon. Might
have been road damage, but it took a couple years to find it. Now
that I have it fixed the compressor won't cycle, so I need to dig
around and find out why. Too stinking hot to drive a W124 right now
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