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besides making a sqeeling noise , or leaking from the weep hole , you can wait until the thermostat is open ( top radiator hose will be HOT ) and squeeze the top radiator hose , when you stop squeezing the hose if there is no surge of coolant flowing through the hose then your water pump is not actually circulating your coolant and has a bad impeller inside the water pump
Wiki User
∙ 15y ago
billyshiver6211
One of the things I check is the pulley or impeller mount by rocking it side to side and listening for any noise or lost motion. there shouldn't be any at all.
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