Hi Peter,

I caught this topic late so I missed your primary symptom. I believe you
stated that you think the engine runs hot and the coolant level rises. If
I'm mistaken please restate the symptoms. Since the coolant can only be
contaminated with combustion gases or engine oil(manual trans), if a problem
exists it must be combustion gases. You stated checks were made for CO2. I
hope you meant CO. Forget about Carbon Dioxide, you need to check for Carbon
Monixide. If the check for CO was negative, the cylinder heads are
OK!!!!!!!!! Look elsewhere for something that can displace the engine
coolant.

Aside from all this, do you really have a problem? I have '86 & '91 2.1L
Vanagons that run and cool properly. After a 2.1L cooling system has been
opened for major repairs or a coolant change, the system is bled normally
with the front wheels raised on ramps until NO bubbles appear from the
radiator bleeder. Following this bleeding, the cooling system functions
normally. However many miles after a successful system bleeding, if the
radiator bleeder is opened, BUBBLES WILL APPEAR!!!!
This is normal and NO corrective action is needed. Do you really have a
problem??????

Regards,  John

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