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harborman harborman is offline
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Join Date: Dec 2009
Location: SW MIchigan
Posts: 2,119
Originally Posted by dfridleyjr View Post
Hello, new member/poster here. We have a Z3 in the shop, early 1998 so no updates to the engine from later 98. It is overheating but both radiator hoses are cool to the touch....nothing over 90F with a infrared reader and no flow to heater. Have verified lines to radiator and heater are clear/not plugged by using air. First I removed the internals of the thermostat and ran the car. No change. I pulled the water pump even thought the owner said it was new and I can see a new water pump was installed and , has a metal vane style rotor. Vented the system 3 times between the tow tests and even raised the front end of the car. Bleeder valve open each time.

Any suggesstions/questions.

Thanks in advance,

It would seem the hoses should be warmer than 90 degrees. At least 180 and higher. Wonder why the new pump and when was that done? Is the new pump good??
1986 928S
32 valve engine
All stock, automatic, 539 Weissgold Metallic, 70K original miles, Hankook Ventus 2 tires.
Previously owned: 67 Vette, 427 L88 Stingray, 74 De Tomaso Pantera L. Latest addition: 2000 BMW Z3 Roadster
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