Here is a method I've used to check/find leaks on radiators & heater cores.
(Never tried it on oil coolers...)
Take a bicycle tire tube, cut it and attach the cut ends to the inlet/outlet
of the item.
Plug all other openings. Apply air pressure through the tube's valve. The
tube
can expand a bit to act as a reservoir of air pressure. If needed, dunk the
item
in a tub of water (child's wading pool works well...) or apply soapy water
to suspect
areas. Remember that most cooling systems operate at 5-12 psi so don't
over-do
the air pressure.
Eric
<edited copy>
Date: Wed, 11 Apr 2001 13:13:48 -0500
From: S & M Barnes <barnesms@swbell.net>
Subject: Testing stuff.
Is there a simple, effective way to test radiators, heater cores and oil
coolers for leaks before I put them back on the car and find I have to pull
them off again?
MikeB
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