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No heat in the radiators in the upstairs of our home.

We replaced the circulating pump just before the season. When we turned everything on it worked well. Then we got a warm weather spell and turned the thermostat down again but left the pump running. when we fired it up again after a couple weeks the upstairs radiators did not get hot. I suspect a vapor lock situation but this is a sealed system and I cannot find any bleeder valves on the baseboard type radiators. How do I trouble shoot and fix this problem? The system is working extra hard to keep the house warm. Now that the colder air upstairs naturally finds its way down stairs.

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Hi, What your looking for is called a (hy-vent). it bleeds air out of a system. you should have one on the top of your expansion tank. it is 1-1/2" in diameter and about 3" long. there is a little cap on top, unscrew the cap off. it looks like a bicycle tire valve. press the stem down inside until water comes out, then put the cap back on leave the cap loose so the hy-vent can do its job. it should be a self bleeder.

If this doesn’t work for you, please write back. Thanks,

Posted on Nov 23, 2008

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