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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

93 VW Corrado V6, Mystery Coolant Loss
Q: My son owns a '93 VW Corrado V6. In the span of 2-3 days of driving, the coolant in the reservoir is completely empty. The dealer has checked the pressure, the container, hoses, replaced the thermostat, checked head gasket possibilities, performed carbon tests, almost everything imaginable, to no avail. They are at a loss. They have not been able to duplicate the problem in the shop, even under extreme conditions at high idle for an hour or so. It only occurs during actual driving on the road. There are no visible leaks anywhere. The only visible fluid is on the container itself, due to overflow when driving. Help! Any suggestions? ....Nick

A: Idling in shop for an hour or so, is not an extreme condition. It's rather easy on the engine and cooling system. The real strain to a cooling system is removing the heat that is created when the engine has to move the vehicle at highway speed. A clue to your problem may lie in the answer to one question. Why is coolant being pushed out of the container (coolant reservoir) while driving? If the coolant is at the correct level and the cooling system is functioning correctly, there is no reason for the coolant to be forced out of the reservoir while driving. My suspicions are that the engine is in the early stages of a failing head gasket. A failing head gasket will cause coolant to be consumed by the engine, exiting as white vapor via the tail pipe. The additional load of highway driving will force combustion gases by the failing gasket into the cooling system, forcing coolant out of the reservoir. (Which would explain the coolant overflow problem.)

The early stages of head gasket failure can be difficult to diagnose. Pressurizing the cooling system overnight can be effective at identifying early head gasket failures.

 
     
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