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Originally Posted by Brian Carlton
Start with the basics.
Open up the monovalve and check the condition of the diaphragm. 90% of the problem with "no heat" is caused by a tear in the monovalve diaphragm.
If the diaphragm is torn, replace it and you're done.
If the diaphragm is good, put it back together and unplug the monovalve and drive it. See if you then have heat.
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Yea, that is exactly what I would do.
If that didn't solve it I would put a pressure tester on the radiator and open the return line from the core. I would plug the engine side and I would pump the system and see what came out (the valve should be open if the key is off). You might be able to do this without the pressure tester by just reving the motor with the engine side off and something to collect the flow. Doing it that way of course empties the system rather tahn bleeding as the pressure tool woul allow.