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Re: Volvo MD6A over heating
The heat sensor is wired off a plug temperature sensor on the exhaust manifold. I changed the wire terminal with a fresh one.
I will check to see if it is a semi-plugged water exhaust elbow. Very easy to do.
For the past 26 years I have had my own water exhaust elbow design made up in third world machine shops all over the South Pacific and Micronesia. Gone through 4 so far. Probably 1/16 the cost of Volvo's price.