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You are here: Experts > Home/Garden > Auto Repair > Volkswagen Repair > Engine cooling
Expert: Gerald Schwartz
Date: 9/29/2008
Subject: Engine cooling
Question
I have a 89' VW Jetta 1.6L non-turbo diesel. The engine temp is fine low speeds but drops at highway speed. It's almost like the thermostat is stuck open but it tests good. Also, the colder the outside temp is the colder the engine runs.
Answer
Robert,
Your sending unit or dash gauge are not designed to give you a precise temp reading, but rather a general indication of engine coolant temp. An apparent high or low reading can be qualified by using a thermometer to read the coolant temp in the coolant reservoir...If you get a reading of 150F or higher, you should be OK. As I recall, the thermostat in the 1.6L is designed to be full open at 190F, and will read cooler at the reservoir. Understand that heat is the enemy of these small diesels...if your operating temp is a bit low, you may just have an efficient cooling system. Rejoice! Jerry
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