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Checking the water pump........ Posted by Herb Hirsch [Email] ![]() ![]() ![]() In Reply to: Coolant odor under hood, no sign of leak., Don ![]() |
Two common candidates for leaking coolant are the water pump and the heater control valve. Both are more prone to leak only when the car is fully warmed up and there is some pressure in the cooling system.
1. CHECKING THE WATER PUMP: On the morning After you've parked the car for the night following a good run.....look at the ground adjacent to and inside of the right front wheel; a puddle of coolant is the clue....almost definitely the water pump. Next, jack up the car, with a jackstand supporting the car, and check the waterpump housing right where the shaft sticks out; typically you'll find evidence of the leak.
2. CHECKING THE HEATER CONTROL VALVE: A slow leak from this valve hits the catalytic converter. As a result you never see te leak or any evidence thereof. Some carefully looking (you may have to use a mirror on a stick) will help find this source of a leak.
3. CHECKING THE HEAD GASKETTE: First, make sure that the problem isn't being caused by the water pump or the heater control valve. Steadily dropping coolant levels is one of the symptoms. Hard to start and missing when first started will eventually show up. Finally, when the symptoms become more obvious, the spark plug in the area of the head gaskette leak will look quite different from the other three....sort of whiteish.
All of these three causes may start slowly and progress towards very robust symptoms that are easy to track.
Herb Hirsch
South Brunswick, NJ
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