I have fored air furnace, i change the switch middle of the winter but after a month start blowing cold air now is time to take care becasue winter is going to be in couple of months, so please can you tell me what wrong.
Check your flu pipe and make sure there is no obstruction in the entire pipe. Sometimes the exhaust fan for the flu will not come on because the safety will not allow it to and it will also cause the fan to run, but not the burners to engage ignition.
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The problem is excessive down draft or condensation. Air flow is important in combustion appliances. Too much airflow down the chimney can blow the pilot out. This is readily apparent when it gets cold and there is air rushing down the chimney in the winter. There may be an air leak in the room with the water heater. While there should be a combustion air supply that is sufficient, there should not be a place for the air coming down the cold chimney to go. That would eliminate the draft. Another thing is if a furnace is in the same room and does not have enough air to supply the burners. IF it is an older furnace without a combustion exhaust fan or has its own flue, the air being drawn into the furnace burners may be blowing the pilot out. Last but not least is the condensation issue. When cold water enters the tank it can cause water to condensate on the outside and drip down into the burner and put the pilot out.
I have a 2000 pontiac grand prix with a digital climate control system.
The heat quit working, it doesn't blow out any heat. Now that it is warm
outside the air stopped blowing out any air. The digital temperature on
the climate control is not correct. When it states that it is below 30
degrees on the ext and it is warm outside the air wont be cold. Once it
starts going above 30 degrees the air gets colder. Today the blower stop
working all together. Was told it maybe the climate control unit was
bad. You can hear the door opening/shutting when you switch the temp
from cold to hot. But there was no heat blowing out whatsoever in the
winter time. Could you please give me your opinion on whether or not it
is the climate control unit or something else?
that switch controls a vacuum operated door that lets a/c or heat thru.when accelerating,the vacuum in the engine changes so it sound like a vacuum issue.take apart the center stack and there is a vacuum actuator in there connected to the flap door .i have seen those have issues with the metal tab broken away from the plastic that moves it.is the a/c piping cold under the hood where it goes into the heater a/c assembly?the compressor should be cycling on and off and the pressure tested.