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Q: Heater and Coolant Leak

asked by on

I first noticed a small spot under my car in my driveway last spring, but it only happened a few times so I did not think much more of it. Now my heater is not functioning properly. It will kick out cold air at times with the heater on high and engine temp right in the middle of the gauge. Other times, mostly on highway driving or when I gun it, then the air will get hot again. The temp gauge in the car only creeped up twice. Once when sitting in a drive thru line and other time driving 55mph (but went down when I turned the heat/cold air on). I topped off the coolant (it was VERY low), and it appears in a few days the coolant level in the reservoir has already dropped some. Therefore, I assume there is a coolant leak somewhere. I would rather not jump to the conclusion to change the water pump due to the HIGH replacement cost, so are there some other things I can check first?

My car has 126000 miles.
My car has an automatic transmission.

A: In order to find a coolant leak, I would re...

In order to find a coolant leak, I would recommend enlisting the assistance of a qualified professional to perform a cooling system pressure test on your vehicle. This will pressurize the cooling system with the engine off. This will enable leaks to be found much easier without the wind from the cooling fan and the noise from a running engine. Some possible sources of leaks other than the water pump would be the radiator, coolant hoses, the engine itself, or the heater core. I would recommend having all of these parts visually inspected as well to verify where the leak is coming from. YourMechanic offers a repair and diagnosis service preformed by a mobile, professional mechanic that will commute to your location to resolve your coolant leak.

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