The dryer and exp valve are so inexpensive, why not?

I have also been taught that whenever the system is opened, you replace the accumulator/dryer.

Yes, replace the o-rings. I am sure the hoses are fine.

Schrader valves are also inexpensive, I would replace.

Test the temp sender on the head, if questionable replace. I would get the red one as it kicks the aux fan on soonest.

I would consider a flush so you can have the correct amount of oil in the system upon compressor install.

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]