[Vwdiesel] '81 Rabbit questions

[Rolf Pechukas]

new-to-me 26-yr-old Rabbit with a handful of issues
thought I'd throw them there:

1. running HOT
yesterday on the highway got up into the red
got out, checked her over thoroughly, topped up coolant
made it the rest of the way driving @ 55
but still flirting with the red
and few minutes ago the oil light was a faint dull red for a minute  
or two after a short local drive
possibly oil filter? oil pressure? hate to admit I haven't put a new  
filter on there since I bought it

2. leak
don't know if this is related, but where the PCV hose comes into the  
air filter it's wet on top of the filter housing - I assume oil, but  
maybe had a little diesel smell to it?
excessive blow-by?
head gasket?
but the coolant has no sign of oil
anyway, damp up there

3. klunk
OK, on to the suspension
pass side gives an alarming clunk occasionally going over bumps or  
around corners - anytime flexing of or shock to the frame
not sure whether from or rear - SOUNDS like front when I'm driving,  
but when I get out and shake the tires I hear it in the rear
any ideas what this might be/where I should look?

4. door locks
driver's side door will not lock w/ the key
I have to reach in from the passenger's side to lock or unlock
how to fix?


I'm sure there's more, but this off the top of my head
thanks for any thoughts
-- 

Rolf in MA