Boil Over Blues

Boil over is often caused by loss of coolant out of the overflow.  Reproduction radiators do cool better than the originals but they don’t have the flow capabilities due to smaller tubes.

When driving at road speed the water pump sends more coolant to the top tank of the radiator than can flow through the coils.  Consequently, the excess goes out the overflow.  As the coolant level decreases, this causes overheating.

A good prevention is to trim the three blades in the water pump to slow down coolant transfer.  The down side to this is parades or slow, heavy traffic.  The best thing is to carry coolant with you and replace as needed.

This tech tip was provided by AJ Pennington and was printed in the August 2003 “A” Quail Call.

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