Heater doesnt work

Dupuis 1951

New User
I have a 1974 IHC 966 tractor. I have no heat in cab. Had the heater core flushed. Checked all lines. Topped off antifreeze mixture. Heat gauge does not come off of cold. Could it be an air lock? Any suggestions???
 
You have checked the hose shut-off valves? That tractor wont get hot/warn just idleing/poopin' around the yard,especially in cool weather.Cover the radiator,work it to get the temp up. Maybe the impeller of the waterpump is bad.Probably not,as the tractor stays cool.
 
Thermostat always open? With a good operating cooling system, you may need to cover the radiator to get the engine warm. I plow
snow with my backhoe....no cab. I still run cardboard over the radiator to get the engine warm. Not a big fan of running a cold
engine.
 
(quoted from post at 19:30:14 11/14/18) I have a 1974 IHC 966 tractor. I have no heat in cab. Had the heater core flushed. Checked all lines. Topped off antifreeze mixture. Heat gauge does not come off of cold. Could it be an air lock? Any suggestions???

"Could it be an air lock?"

YEP! ASSUMING this has been a working system in the past and the core is open and free-flowing it's quite possible it's "air locked".

Been there, done that with a variety of tractors and machinery.

Stop and think about it... air bubbles rise, and the heater core at the top of the "cab" is WAY above the level of coolant in the radiator, and (once primed and working) with the system cool you can remove the radiator cap and the coolant stays WAY up there in the heater core, and doesn't drain and spew out of the open radiator neck.
 
Ya have to BURP the air out of the system . Stop and think where the heater core is . Myself i would start with a new T stat , then once that is installed ya fill the rad up to the top , next you loossen the clamp on the hose that has the water control valve on it at the heater core then make sure the valve is open . Next start the tractor and run the engine at around half throttle this will give max flow to the water movement and push all the air out best yqa can , once you have water;'/coolent coming out tighten up the hose clamp and run the engine for awhile . The guys that said to cover the rad up was giving good advice if you are not working the engine they really do not make much heat even with a new stat . due to the capacity of the cooling system and flow . Also wrapping the hot line with insulation from the top hose back helps . Now keep tis in mind that you can loose our prime when you open the rad cap up to look at the coolant level . I go thru this with my one buddys skid steer atleast three or four times a winter as each time he opens the cap water/ coolant comes out . and and air bubble is formed and i get the call ( my skid steer is not making any heat again ) . On his his has a puk tank that you are suppose to use to check coolant level not open the cap and even says so on the cap . On the 966 it does not say that . I know my other friend that a 966 with a year round cab i had to burp his and show him how and the one year i helped him while doing corn and running corn to town the only way ya got warm , NOTICE i said WARM air coming thru the heater was when she was on the road pulling two 400 bushel wagons and working , on the return trip empty the six miles back ya go luke warm air and while waiting you had A?C on and that tractor does not have A/C .
 
I installed shutters on my H a year or two ago, and she finally warms up, turns out hot air, warms up the engine just fine. Never did before.
 
2x on the Thermostat. Not to over simplify, but the thermostat is a valve operated by a bimetallic bulb. So when water is not at operating temperature the valve is shut. When the coolant comes up to temp the valve opens to allow the coolant to circulate through radiator to be ccoled. So if the thermostat is stuck open as they sometimes do the coolant will never reach operating temp on a cool day. The thermostat is generally located in the housing where the top radiator hose connects to the engine. One thing that can tell you if the thermostat is indeed stuck open is to start the tractor cold and raise the rpm to a fast idle. Then open the radiator cap and look in and see if the coolant is swirling around. If so the thermostat is likely stuck open.
 

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