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Old 10-03-2003, 09:23 PM
Jackd Jackd is offline
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Join Date: Jul 2003
Location: Montreal, Quebec
Posts: 508
The auxiliary water pump is necessary to keep the water flowing throgh the heater radiator when the engine is at idle.
If you're stucked in traffic (idle) for a certain period of time, the engine water pump does not generate enough circulation to feed the heater radiator. After a while, the coolant cools-off in the heater and you have no more heat.
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