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YZThump

Monsoon Running Cool

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YZThump

My Monsoon 340 usually runs exactly at 160 degrees all day long. Yesterday, it would not budge above 110. I thought the gauge was hosed, but the heater was noticeably cooler as well, so the engine is definitely running cool. What do you guys think? Thermostat stuck open?

BTW, It ran beautifully all day long - no smoke, stumbles, coughs, or any other indication that something was amiss (aside from the temp.)

thanks

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Sunsetter95
My Monsoon 340 usually runs exactly at 160 degrees all day long.  Yesterday, it would not budge above 110.  I thought the gauge was hosed, but the heater was noticeably cooler as well, so the engine is definitely running cool.  What do you guys think?  Thermostat stuck open?

BTW, It ran beautifully all day long - no smoke, stumbles, coughs, or any other indication that something was amiss (aside from the temp.)

thanks

Sounds like a good inexpensive place to start. You might consider trying it again incase it was a fluke.

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VinRLX

and or tapping on the housing?

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Malibudude

I'd certainly try it again to duplicate the same issue. THe thermostat is relatively inexpensive to replace and is where I'd probably begin.

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jgouveia3

boil it and see if it opens and closes when cools.

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Boomer

My new Monsoon has also been running too cold since I got it, 120-140. Like yours, my heater doesn't heat much at all, and it causes it to really suck gas.

I've got it in for the 10-hour service, hopefully just a bad thermostat.

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67rway

Mine also ran cool, so I pulled the thermostat and tested it. Partially opened continuously from about 120, fully opened at 160, and began to close as temp dropped. So I put it back in.... no problem since.

Go figure!

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Web

When you sat at idle did the temp creep up? Then when you got under way it would go back down? If so, I vote on thermostat.

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YZThump
When you sat at idle did the temp creep up?  Then when you got under way it would go back down?  If so, I  vote on thermostat.

We never really idled that long to notice much of a difference...

Thanks for the replies, guys. I guess I'll pull it and do the heat a pan of water test. I assume I'm going to need a new gasket to put it back together (or is it a liquid gasket?)

thx

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