the rubber grommets around the thermostats should seal them. I its peeing, teh thermostats are opening. Check each head to make sure they are both opening. A heat gun from harbor freight is cheaper than new thermostats from mercury. Temp stick markers are pretty useful as well. You can test your thermostats in a pot on the stove, open them up just enough to stick some string in them. Put a thermometer in the pot full of water. Hang the thermostats in the pot by the string. Heat the water, watch the thermometer and when the thermostats fall off the string, you know the operating temp. Or you could try a couple quarters, drill a 3/8 hole in them to start with.
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