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I have a T87 that i was replacing, red with red, white with white none of the setting fron behind work, the thermostat started to smoke, i could not connect it, what to do?

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It sounds to me like you may have a defective thermostat. I would check wiring to furnace cotrol board on furnace and see if its is wired differently.If at this time of year for heat only red and white should do it. Hope this helps. Thanks

Posted on Nov 12, 2010

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I've replaced my very old (mercury) Honeywell thermostat with a new one (round, Model: YCT87K1011), but I can't get it to control the temperature. If I connect the two wires one way, the furnace comes on...


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1993 Mercury Sable, white smoke, overheating


Good Day,

White some indicated that coolant is burning off. It could just be a simple leak which is burning off of the hot motor. It could also be a bad head gasket(probably what you don't wanna hear), One indication that it is the head gasket is white smoke coming out of the exhaust, this happens as coolant gets into the oil and is burned off then exhausted out the back. Possible causes for the overheating include, low coolant, coolant leak, thermostat, water pump and or water pump belt, or head gasket.

If I were you I would drain and flush the radiator, then fill it with new coolant, and change the thermostat, provided you have no white smoke coming out the exhaust.

hope this helps for now

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