FORUM RULES UPDATED - The forum rules have been updated to continue to provide a friendly and safe environment for our member community. Please take a moment to review the updated rules and our terms of use and privacy policy. Click here for Forum Rules which has links to the 'terms of use' and 'privacy policy'.
An aftermarket closed loop cooling system was installed on my 1998 Mercruiser 7.4l engine about 7 years ago. I recently replaced the water pump and thought I would replace the thermostat while I was at it. There was no thermostat installed. The boat has been running at about 153 degrees F and...
