Thermostat help needed

[sundown57]

I put a Kubota V1305 in a bobcat, now I'm trying to hook up a cab heater, All the thermostats I see are 71C (159F) does anyone know if there is a 180 or 190 That will fit that engine? thanks

 

[DustyRusty]

You will be perfectly fine with that thermostat for a heater. I don't know why they have such a low-setting thermostat, but is it possible that it is measured in Celsius degrees?

 

[sundown57]

You will be perfectly fine with that thermostat for a heater. I don't know why they have such a low-setting thermostat, but is it possible that it is measured in Celsius degrees?

then i may have to put a pump on it . I ran it over an hour today and just not getting much geat. I also have it mounted above the radiator so maybe the water pump just cant circulate it that far up.

 

[Dave_eng]

On a closed hydronic system, which is what your cab heater is, getting fluid flow above the top of the rad is tricky.

If it were your home, I would tell you it is not the circulating pump which will move the fluid up hill but rather the system fill pressure. 15 psi of fill pressure will raise water up 32 feet.

I know there are tractors with heater cores in the roof of the cab.

I have not studied how they establish circulation. Others who have such systems will comment.

If I was faced with the situation, I would simply fill the system at the highest point with the rad cap on.

Put a Tee at the highest point and add fluid through the tee.

Dave

 

[sundown57]

On a closed hydronic system, which is what your cab heater is, getting fluid flow above the top of the rad is tricky.

If it were your home, I would tell you it is not the circulating pump which will move the fluid up hill but rather the system fill pressure. 15 psi of fill pressure will raise water up 32 feet.

I know there are tractors with heater cores in the roof of the cab.

I have not studied how they establish circulation. Others who have such systems will comment.

If I was faced with the situation, I would simply fill the system at the highest point with the rad cap on.

Put a Tee at the highest point and add fluid through the tee.

Dave

what i did was unbolt the heater and lower it to below the rad and ran it till i felt the hoses warm up. they filled the rad and remounted the heater to the roof. but then the hoses when cold again.

 

[Roadworthy]

Try filling the heater and the hoses after it's in its final position. You may be trapping an air bubble somewhere in the heater core or hoses.

 

[GreensvilleJay]

I'd expect a 'purge' valve at the highest hose position,same as every house hot water rad system.

 

[ruger1980]

Where do you have your heater hoses plumbed into the engine? You need a pressure differential for flow to occur.