[DML] Cooling Problem

[Shannon Yocom <ssdelorean@xxxxxxxxx>]

I'm having a cooling problem and need  help with trouble shooting & diagnosing...

Back story...
Last Fall my alternator belt broke and I almost over heated. So I replaced my
"otterstat" just to be safe. Two different new otterstats later my fans would
still not cycle off properly (outside temps in mid to high 60s). I put the
original back in and all is well.

Fast forward to this Summer...
Now my car takes forever to cool back down after the fans cycle on at highway
speeds. This does not happen when traveling on surface streets at 25-35mph (it
cools and cycles rather quickly). At first I thought this was due to outside
temperatures being in the 90s but found out that is not always true but plays a
key role. Why would my car have a hard time cooling down at highway speeds
(65-75mph) than in stop & go traffic?

Other oddities:
- running the AC causes my car to run warmer than normal. It slowly creeps up to
around the 220 mark and hovers there.
- on a recent trip from OH to GA and back I noticed my fans would kick on an off
at different temperatures. It was mostly normal but a couple of times not at the
usual "on" & "off" temps. This makes me think the original "otterstat" may be
bad.
- even traveling thru the cool of the night I noticed at times my the temp to be
warmer than normal (even at times when I was NOT stressing the engine by climbing
up hills or passing)

Before the trip I replaced the thermostat and blew out 20yrs worth of dirt & dead
bugs from the original radiator. Also tested the in & out temps of the radiator
and there is a 25 degree difference. My car has the self bleeding kit installed. 

Tonight I am going to try a different "otterstat" (98-93 degree). This time I
hope my fans will cycle off. If they do not is there anything else I can try? 

Toby, how's that new adjustable "otterstat" project coming? Do you think that
could solve my problems?

Any other things that could be causing this that I could look into?
Thanks in advance to any and all help.

Shannon Y
16506


		
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