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|vb||I have European 4040S John Deere it was build in 1981 and has a 359 turbo with a comfort cab. This tractor is very close to the US 4050. The problem Iím having is with the cab heater. I disconnected the heater hoses at the base of the cab but no coolant running out. I just got done flushing the system and water ran thru it fine. Is this a water pump problem or something else? Thanks if you have an answer.
|Mike||Follow the lines back to the engine a make sure there isn't a shut-off installed somewhere. If the water pump is working properly, you should be having an overheating problem.
|vb||Thatís what I thought, that there might be some kind of shut off. But I took the heater hose off from the water pump and the return line that goes into the block and ran the garden hose through it. Water went up through the evaporator above the cab back down the other side. I refill the coolant started it up let the thermostat come up still no heat. Thatís when I start disconnecting hoses. First the pressure side above the cab none thing, than the hoses at the base of the back of the cab. I got coolant, but only from gravity, no water pump pressure. I think if it was a water pump I would see over heating, leaking or hear a noise. The next thing I Ďm going to try is run a hose from the pressure side of the water pump down into a bucket and see if thereís pressure.