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Home A/C Problem #4463000
07/18/17 03:11 PM
07/18/17 03:11 PM
Joined: Apr 2013
Posts: 2,330
The Northeast
mclasser Offline OP
mclasser  Offline OP
Joined: Apr 2013
Posts: 2,330
The Northeast
Any HVAC people in the house?

My home A/C started acting weird today. The inside furnace is making a groaning noise but not moving any air. It's like it's trying to ramp up but can't. The outside condenser fan is spinning and the thermostat is clicking on like it should. When I switch over to heat, the furnace starts working again and hot air comes out the vents.

It seems like some switch is bad. I checked the breaker box and nothing has been tripped.

What could be the problem? Of course this happens during a super hot and muggy week.

Last edited by mclasser; 07/18/17 03:12 PM.

2018 Hyundai Elantra VE -- 4K
2013 Honda Pilot EX-L 4WD -- 56K
2002 Honda Accord EX-L -- 211K

Re: Home A/C Problem [Re: mclasser] #4463003
07/18/17 03:16 PM
07/18/17 03:16 PM
Joined: Oct 2004
Posts: 7,974
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 7,974
Cincinnati, OH, USA
Multi-speed blower motor? What happens when you turn the fan switch on the thermostat to "ON" when it's in heat? Does the air stop moving (fan on position is normally high speed, same as A/C mode)?


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: Home A/C Problem [Re: mclasser] #4463012
07/18/17 03:24 PM
07/18/17 03:24 PM
Joined: Sep 2007
Posts: 968
TX, USA
JMJNet Offline
JMJNet  Offline
Joined: Sep 2007
Posts: 968
TX, USA
Is there any like electrical switch that control the blower near the unit?
If yes, check make sure that switch is not burnt.

If the air handler fan have capacitor, you may want to check that.
Although a lot of the newer ones are DC Fan so it is more difficult to troubleshoot as supposed to just changing the capacitor.

While at it, you may want to check the capacitor on the condenser/condenser fan and start capacitor on the outside unit.

Otherwise, you need an AC Service to troubleshoot.


  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: Home A/C Problem [Re: mclasser] #4463025
07/18/17 03:36 PM
07/18/17 03:36 PM
Joined: Mar 2013
Posts: 911
Florida
laserred96gt Offline
laserred96gt  Offline
Joined: Mar 2013
Posts: 911
Florida
Blower motor is running in heat but not in AC mode, weird. Don't let the condenser operate without the blower for too long otherwise the evap coil will turn into a block of ice.
Any info on the age or brand of the equipment ?

Last edited by laserred96gt; 07/18/17 03:38 PM.

96 Mustang GT: Castrol Edge 5w50
04 E-150, 4.6, 226K, PU 10W30.
11 Camry 2.5, 60K, Castrol Edge 0W20.
Re: Home A/C Problem [Re: mclasser] #4463064
07/18/17 04:28 PM
07/18/17 04:28 PM
Joined: Apr 2013
Posts: 2,330
The Northeast
mclasser Offline OP
mclasser  Offline OP
Joined: Apr 2013
Posts: 2,330
The Northeast
I know nothing about HVAC so I don't feel comfortable messing with anything. My homeowner's insurance covers HVAC equipment so I'm going to let them handle it. Some quick Googling pulled up faulty start/run capacitors like JMJNet said.

Outside condenser unit is a Trane and furnace is a Carrier 8000 Weathermaker. Both were there when we bought the house 10 yrs ago.

Last edited by mclasser; 07/18/17 04:29 PM.

2018 Hyundai Elantra VE -- 4K
2013 Honda Pilot EX-L 4WD -- 56K
2002 Honda Accord EX-L -- 211K

Re: Home A/C Problem [Re: mclasser] #4463097
07/18/17 05:07 PM
07/18/17 05:07 PM
Joined: Dec 2006
Posts: 7,650
Toronto, Canada
KrisZ Offline
KrisZ  Offline
Joined: Dec 2006
Posts: 7,650
Toronto, Canada
The thermostat should allow you to turn on just the furnace fan, without having the AC or heat on. Try it see if it works then. If it starts running, turn the AC on the thermostat. It may work at least until it is properly fixed.


2015 Dodge Grand Caravan-27k miles.
2006 Mazda 3-163k miles
Re: Home A/C Problem [Re: mclasser] #4463161
07/18/17 06:22 PM
07/18/17 06:22 PM
Joined: Mar 2013
Posts: 911
Florida
laserred96gt Offline
laserred96gt  Offline
Joined: Mar 2013
Posts: 911
Florida
At first sounds like a bad capacitor, but you said the fan runs in heat mode so that throws out that idea.


96 Mustang GT: Castrol Edge 5w50
04 E-150, 4.6, 226K, PU 10W30.
11 Camry 2.5, 60K, Castrol Edge 0W20.
Re: Home A/C Problem [Re: mclasser] #4465121
07/20/17 03:56 PM
07/20/17 03:56 PM
Joined: Apr 2013
Posts: 2,330
The Northeast
mclasser Offline OP
mclasser  Offline OP
Joined: Apr 2013
Posts: 2,330
The Northeast
UPDATE: Home warranty company sent out their A/C guy today. He replaced the capacitor and the ice cold air is back!


2018 Hyundai Elantra VE -- 4K
2013 Honda Pilot EX-L 4WD -- 56K
2002 Honda Accord EX-L -- 211K


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