Indmar 400 Thermostat

[Mxmark4]

Dont forget to check your hester recirculation pump. Known leak location

[HFarr]

Yeah. I totally forgot about the circulation pump. Even though it always showed at the minimum mark, I ended up putting about 2 drinking water bottles in the reservoir, and the temp started acting better. So yep, probably air in the system from a slow leak somewhere. I will also try disconnecting the batteries for about an hour next time I am there. Maybe that will cure my display gremlins. My batteries are 5 years old now but seem to start just fine. However, I'm not sure if they may be part of the problem though. Even though the alternator is putting out 14 volts fine, I know today's electronics are battery dependant. Found that out with my daughter's brand new Kia that would shut off and not crank back for no apparent reason within 1 year. Dealership couldn't find anything wrong. Off of some internet chat room advice, I replaced what tested as a good battery and problem solved.

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[MJHSupra]

Slow leaks are hard to find. It took the dealer a little while to find mine after it overheated once.

[Mxmark4]

You can rent a pressure tester from Advance or Autozone and pressure test the system if you dont have one. They have a big kit that fits most reservoir caps.

[996scott]

The heater circulating pump was the problem for me. I was overheating if I was just ideling but as soon as I got up to speed the temp came back down. I removed the heater pump and saw that it had been leaking. I replaced the pump and decided to refill the system and it solved the problem.

https://www.indmardealersupport.com/news-letter.php

[HFarr]

Thanks! Both of these are sending me to check that for sure! I didn't think about the pressure test gage. Think I will start there!

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