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Username Post: HVAC Air Handler        (Topic#350530)
Charlie57 
Valued Contributor
Posts: 3098
Charlie57
Loc: Lebanon, Tennessee
Reg: 03-30-08
04-08-18 12:15 PM - Post#2730349    

I have a GB-3BM-024K-A-05B Air Handler, I only knew it's called a air handler after I googled the part number.
Here is the problem, When it should kick on I hear a faint hum but nothing happens.
[image]IMG-9502 by Charlie Shew, on Flickr[/image]

[image]IMG-9506 by Charlie Shew, on Flickr[/image]
The piece in the back of photo clicks but nothing happens, that really all I have to go on.
IMG-9508 by Charlie Shew, on Flickr

"Charlie's 57 Chevy" I made it's very own FaceBook page please visit and "Like"
http://www.facebook.com/pages/Charlies-1957-C hevy/214078481937849


 




CowboyTrukr 
"8th Year" Silver Supporting Member
Posts: 4255
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
04-09-18 05:32 AM - Post#2730440    
    In response to Charlie57

Charlie,

It’s very possible that you have a bad capacitor. Didn’t see one in the pics you sent, but it’s an oval shaped silver can with a pair of wires in one end. It might even be round like a Red Bull can, but either way they provide the voltage boost to spin the motor over to compensate for voltage loss and high current at locked rotor(motor starting from a standstill).

It may not have a capacitor in which case the contractor you’re hearing is toast, or the rotor is actually locked.

Does the motor turn over at all by hand? If it’s still free then it could be the contactor.

My money’s on the contactor.

Greg

'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
acardon 
Ultra Senior Member
Posts: 11290
acardon
Loc: DFW TEXAS
Reg: 03-25-05
04-09-18 06:58 AM - Post#2730445    
    In response to CowboyTrukr

I agree. The capicator (CAP)is shown in the diagram next to the motor speed taps. Take it to a HVAC supply and they will match it.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


Edited by acardon on 04-09-18 06:59 AM. Reason for edit: No reason given.

 
Charlie57 
Valued Contributor
Posts: 3098
Charlie57
Loc: Lebanon, Tennessee
Reg: 03-30-08
04-16-18 04:09 AM - Post#2731128    
    In response to acardon

I installed a new capacitor, it made noises but it did not fix it. I tried to turn on the AC and heard what sounded like fluid moving in the lines but nothing else happened. I than tried the heat and with the cover still off and in the dark there was a red glow from behind the fan and than maybe a spark, but it did pop and the glow went away. I cut the unit off.
Any Suggestions?
Charlie

"Charlie's 57 Chevy" I made it's very own FaceBook page please visit and "Like"
http://www.facebook.com/pages/Charlies-1957-C hevy/214078481937849


 
100 CHEVY 
Dedicated Member
Posts: 6499
100 CHEVY
Loc: Helena,Missippi,U.S.A.
Reg: 12-09-04
04-16-18 06:51 AM - Post#2731138    
    In response to Charlie57

Was it the fan that made the noise?
What happened is when the heat came on,there was no air moving to cool the heat coils,so the high temp heat sensor clicked to "Open",shutting off the power to the heat system,(the spark you saw and a click you heard).This is a safety to prevent a fire.
It sounds like you have a blower fan problem.Either a bad bearing or a bad winding.Could be just a bad or loose connection too.There's also a small relay involved that selects the fan speed according to the system heat/cool from the thermostat.
Mike.

"You gonna leave it like that?
http://www.picturetrail.com/100chevy


 
Charlie57 
Valued Contributor
Posts: 3098
Charlie57
Loc: Lebanon, Tennessee
Reg: 03-30-08
05-05-18 09:03 AM - Post#2733090    
    In response to 100 CHEVY

It was a humming noise, the fan did not move, it did not seem like it was trying to turn. It does turn freely by hand.
I happened to be near it the other day and with the thermostat in the off position the unit was making a low humming noise for no apparent reason so I turned it off at the breaker and the sound stopped. I'm thinking I need a professional. Do you think it would be worth replacing the relay before I bring someone out?
Charlie

"Charlie's 57 Chevy" I made it's very own FaceBook page please visit and "Like"
http://www.facebook.com/pages/Charlies-1957-C hevy/214078481937849


 
100 CHEVY 
Dedicated Member
Posts: 6499
100 CHEVY
Loc: Helena,Missippi,U.S.A.
Reg: 12-09-04
05-07-18 06:58 AM - Post#2733281    
    In response to Charlie57

Sounds like you have more than one problem to me.
Trying to run with the controls off means it's getting some power from somewhere else.
Could be several things causing it.
Someone needs to go thru the systems electrical and find the cause.
Mike.

"You gonna leave it like that?
http://www.picturetrail.com/100chevy


 
Charlie57 
Valued Contributor
Posts: 3098
Charlie57
Loc: Lebanon, Tennessee
Reg: 03-30-08
05-11-18 04:10 PM - Post#2733722    
    In response to 100 CHEVY

That sounds like good advice to me!
I'll have to call someone who knows what they are doing.
Thanks,
Charlie

"Charlie's 57 Chevy" I made it's very own FaceBook page please visit and "Like"
http://www.facebook.com/pages/Charlies-1957-C hevy/214078481937849


 




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