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Ac dose not work, but heat works

When switched to ac no blower fan not out door unit, no anthing. Heat works good.

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  • 52 Answers

If the condensor fan is not functioning no latent heat will be removed and no cooling of refrigerant,
Subcooling needs to be completed get an Ac engineer to change the fan unit.

Posted on May 20, 2009

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Posted on Jan 02, 2017

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3 Answers

Coleman Evcon furnace blower runs w/ no call for heat. Temp is 5+ degrees above thermostat setting. (Programmable tstat)


When you say door are you referring to the front door or the furnace door? If the unit kicks on AND off by itself I would say it's in the tstat or the tstat wire. If it were internal I would think the blower relay or heat contactor/relay were getting stuck AND THE FAN WOULD NOT TURN OFF until you flipped the breaker. Good luck

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1977 Buick blower / fan comes on however NO heat blower / fan also blows very low.


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Fan doesn't work in heat mode it works on all other functions. Heat does come out but fan doesn't kick in. Outside unit is operating


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Nov 01, 2015 | Heating & Cooling

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Lincoln mark 8, a/c was working, then kept starting and stopping now dead, compressor works, fan wont blow, even on vent or heat....where is the fuse/relay for this or what else could it be?


It is the blower motor,or the blower relay module,near the blower motor,and check the ac/heat control unit,if the blower ,and relay module turn out to be good.

Jul 15, 2010 | 1997 Lincoln Mark VIII

1 Answer

Outside ac unit operates but no blower. Fan "on" does not operate from thermostat. However "heat" works fine furnace and blower. ???


Go to furnace and shut off power, remove blower door compartment. Inside you will find a control board where thermostat wires are connected. Should look something like this:

R-Red Wire= Power
G-Green Wire= Fan
W-White Wire=Heat
Y=Yellow or Blue Wire=Cooling.

It sounds like you have a bad motor speed. So try this:

With Power Still Off, on the same control board there is a terminal usually marked Cool and Heat. There should also be a couple of terminals that are named park. The wires hooked to these are the fan wires..

Exchange the Heat and Cool wires on the terminal board. Put everything back together and try cooling again, if the fan comes on
then you have a burnt out motor speed. Go back to furnace and change
the heat and cool wires around, next if Cooling had the black wire hooked to it, put yellow or blue on Cooling and black to park.


Note: The reason why you put the blower door back on is because it
has a door switch that if not properly seated, you wont be able to power
up anything

Jun 22, 2010 | Heating & Cooling

1 Answer

1998 BMW 328i heater/AC blower is not running


You have clean the blower unit , may be its dirty then . and then check the blower resistor unit for malfunction.

Aug 04, 2009 | BMW 328 Cars & Trucks

1 Answer

I have a thru the wall fedders ac unit. The heat stopped working when you turn it on it just hums.


no blower !!! or heating element is bad or switch try putting the fan on only if it works than it is probaly the switch not letting the blower on only heat

Apr 01, 2009 | Fedders Y Chassis AEY12F7E Air Conditioner

1 Answer

Blower fan only works on high


If it is working at all then the relay and fuse is good and the problem is either the little vacuum hose on the back of the control switch panel or the panel itself.

Feb 01, 2009 | 2001 Chevrolet Silverado

1 Answer

Blower fan will not come on when set on Auto in heat mode.


the fan is controlled by a fan center or a stack switch. as burners light and heat up the spring sensor on the bulkhead above burners heats up and turns and a a point energizes the indoor fan if it gets to hot the burners go out on safty. sounds like a fan control is bad tap on them gently and they sometimes break loose but if not then have a pro replace fan control and test heat exchanger.

Oct 24, 2008 | Ruud UBHC Air Conditioner

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