I would be concerned. Foam normally indicates surfactants
(environmentally speaking) which would indicate a problem with the water
quality that was added to the coolant. But in a radiator, it more likely
indicates oil/exhaust gas leakage into the coolant. When you first start
the car and before the coolant heats up, do you have pressure in the
radiator? The next step would be to run a compression check.
I'd suspect head gasket. But that in itself isn't really a big deal - a
few hours of work, a gasket set, and maybe have a machine shop check the
head for warpage and plane it out.
From: firstname.lastname@example.org [mailto:email@example.com] On
Behalf Of Bill Saidel
Sent: Monday, July 11, 2005 7:05 AM
Subject: Foam in radiator
Just wondering...what does 1-3 teaspoons of 'foam' in the
radiator indicate? I changed coolant and found it both in the old and
new. I did manually open the heater valve to flush that, too, even
I have never used the
heater. (I've had the car for 6 years. In fact, I don't know if it
works at all.)
No foam in oil. No
obvious leaks on the ground (other than
the same old droplets of oil marking territory). No overheating (yet?).
Could it be from a pinhole leak? Should I "worry"?