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Kubota RTV 900 with Curtis Cab
1mountainman,
Your thermostat, if faulty, is probably stuck in the open position. The engine wouldn't last long if it was stuck in the closed position. A new thermostat may solve the problem.
Next...please make sure your radiator cap is functioning properly. A faulty radiator cap will prevent the engine from heating properly.
Make darn sure you don't have a restriction blocking coolant flow to the cab heater core. Check for a valve in the heater hoses, or possibly a sever kink in a hose. Also make sure your heater core isn't plugged up.
Blocking off the great majority of air flow through the radiator is generally the next thing we do. If you still have cab heating problems after doing these things, more drastic steps will have to be taken.
Joel
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Kubota RTV 900 with Curtis Cab
1mountainman,
It's a big help knowing that you were able to see some change in the engine temperature while working the RTV pretty hard. This is a good sign.
Even so, I would certainly start with the radiator cap. It's not an expensive part, and it's worth replacing when considering the hours spent fiddling around trying other things.
Some of the tricks we use up here in the cold north can't be installed in these smaller vehicles. There just isn't enough room under the hood to install some of our favorite gadgets.
Check to see if you have enough room to install a manually operated valve in the lower radiator hose. Somehow I doubt it.....but it's worth a look-see.
Joel
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Kubota RTV 900 with Curtis Cab
1mountainman,
Here's a handy device used on vehicles that operate in cold climates.
See the link below.
Joel
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Kubota RTV 900 with Curtis Cab
Murf,
As they say, "There's more than one way to skin a cat". I've personally never tried it, but that's what they say.
A diverter valve, like the one I posted earlier, can be used in many different configurations. It can close off the flow of coolant to the heater core, or to the engine...depending upon how it's plumbed in.
I looked at the one I posted a link to, and it appears that the hose fittings would be too small to connect to the radiator hoses.....so you're right.....that one probably wouldn't work the way I had intended it to.
What I was trying to accomplish, was to divert all or most of the water in the radiator circuit, through the cab heater core instead........in essence converting the cab heater core to a small radiator....bypassing the main radiator altogether.
1mountainman,
I find it hard to believe that the thermostat isn't opening at all. My little 21hp Kubota engine will overheat if I'm not careful, even at temps well below zero. I have to carefully monitor the engine temp when I block off all of the air passing through the radiator.
I'll stop back after I get the driveway cleaned out.
Joel
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