Quote:
Originally Posted by tangofox007
Loss of heat at highway speed is very likely to be a mono valve problem. There have been a number of reports on this forum of defective after market mono valve inserts that cause that issue.
Classic mono valve symptom.
As designed, the 617.95 engine is self-bleeding. The thermostat housing features a passage that bypasses the thermostat; any air should wind up in the expansion tank.
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In theory it is a self-bleeding system.
Real world experience proves that air generally becomes trapped in the heater core / cylinder head, causing issues.
If you can hear the fluid flow = there is air trapped in the system.
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