Question about Ruud UBHC Air Conditioner

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Heating unit blows warm air then turns to cold air

The heating unit will initially blow warm air, but then cool air starts blowing out. Could there be a problem with a coil? Can temporarily fix the problem by shuting off the unit for about 30 minutes and then turn it back on.

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One or both heat sequences. Check for coil voltage, then outlet side of both sequencers , if it not there, replace. If v is present when called for; check time delays for accuracy. Could be dropping if contact surfaces degrading.

Posted on Mar 13, 2019

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It sounds like unit could be kicking out the low pressure switch or if it is a electric furnace it could be the sequincers

Posted on Jan 24, 2010

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First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is worm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest to flush the heater core.

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May 31, 2009 | Ruud UBHC Air Conditioner

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