Heater Blower motor always on - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Greg Carter · 08-02-2004, 11:20 AM

Hi,

I recently purchased a 1982 GMC 7000 (5 ton dump and 4ton HIAB crane). The interior is pretty much the same as a regular GMC pickup. The blower motor connector was disconnected, after I hooked it back up I found out why

It is always on (with ignition on). Even with the fan setting at "low" and the temp slider to off. Any ideas?

thanks.
greg

Jonboy · 08-02-2004, 11:36 AM

the fan switch on the dash may be shorted out. Try unplugging it with the blower connected and see if it stops.

76bonanza · 08-02-2004, 02:13 PM

That is the way they all are it always runs most people unplug it in summer. I ran a toggle switch to mine so I can switch it off and on. As far as I Know all the chevys are that way at least all the ones I have ever seen.

ocbaud · 08-02-2004, 02:33 PM

its to help keep fresh air circulated since these trucks have such "great" cab sealing.

they thought we would suffocate without air coming in hahahah

BillyJack · 08-02-2004, 04:16 PM

Quote:

Originally Posted by 76bonanza

That is the way they all are it always runs most people unplug it in summer. I ran a toggle switch to mine so I can switch it off and on. As far as I Know all the chevys are that way at least all the ones I have ever seen.

Could you give some instructions on wiring that toggle switch? I noticed mine did that and thought it was messed up. I was gonna start a thread but was too lazy.

I'd like to shut that sucker off. It's annoying to turn the key and hear it (mine needs replacement i think cause it sounds pretty worn out.)

76bonanza · 08-02-2004, 06:11 PM

The wire the you pull out from the motor in the engine compartment I just cut it and ran a switch into the cab.

78SilveradoSWB · 08-02-2004, 07:43 PM

Quote:

Originally Posted by ocbaud

its to help keep fresh air circulated since these trucks have such "great" cab sealing.

they thought we would suffocate without air coming in hahahah

Eric is correct on this one

GM though design this in on purpose, so there is always fresh air circulating in the cab for our pleasure.

screwballl · 08-02-2004, 08:03 PM

i seem to have the problem of it NEVER coming on, even with a new blower motor... no matter where the switches are set to its never on.. it used to work (but only through the floor vents, it never moved from there).

ocbaud · 08-02-2004, 08:11 PM

Quote:

Originally Posted by 78SilveradoSWB

Eric is correct on this one

whats up with the laugh????

you think i'm a tard or something???

**swervin ervin** · 08-02-2004, 09:31 PM

Quote:

Originally Posted by ocbaud

whats up with the laugh????

you think i'm a tard or something???

I think he's saying you are wrong most of the time. As for the tard part, everyone knows this. :p

apstguy · 08-03-2004, 02:24 AM

My blower motor isn't always on. Am I missing something here? GM did make a "flow through" cab - if you are moving, air is pushed through the front cowl through the floor vent to the vents in the bottoms of the doors. That is why there are vents in the bottom of the doors.

78SilveradoSWB · 08-03-2004, 03:01 AM

Quote:

Originally Posted by ocbaud

whats up with the laugh????

you think i'm a tard or something???

No implications whatsoever...

MylilBowTie · 08-03-2004, 05:08 AM

My truck blower turns off If I turn it off. Had a 78 Coupe Deville that always ran if the key was on.

jimfulco · 08-03-2004, 05:23 AM

I think the A/C-equipped GM vehicles had them run all the time so the A/C wouldn't ice up. Or maybe so they would wear out faster & they could sell you a new one.

**76sierraclassic** · 08-03-2004, 02:38 PM

Mine's always on in my '76. It used to blow out the regular vents until I changed out my heater core, and now it blows out the floor vents. I don't know what I changed, but it must have been something.

Mike

Greg Carter · 08-04-2004, 02:16 PM

Thanks for the replys. Sounds like it may function that way.

*Zilverado* · 08-04-2004, 05:03 PM

My '77 (non-A/C) was an "always on" set-up. My '86, A/C truck actually turns off.

Funny, I'm not suffocating

KShortell · 08-05-2004, 11:06 AM

Quote:

Originally Posted by Zilverado

My '77 (non-A/C) was an "always on" set-up. My '86, A/C truck actually turns off.

Funny, I'm not suffocating

Yup, my '86 is the same way. The blower is off when the switch is off. Both the motor and the switch/control assembly have been replaced over the last 6 years. It's always been like this. Now, you do get some flow-through ventilation at speed, but not from the blower motor.

**Captkaos** · 08-05-2004, 01:39 PM

The fan switch is set to be "always on" for the non-A/C trucks. A/C trucks you can turn the fan off.

Justins76 · 08-09-2004, 02:47 AM

The fan is always on on my 76 with factory A/C. Rather annoying to say the least. I even replaced the relays. Off means off!

Russell · 08-09-2004, 03:03 AM

I haven't had my heater fan hooked up for a long time now, but my heater and defroster still work just fine. Just takes a bit longer, hehe

08-02-2004, 11:20 AM	#1
Greg Carter Registered User Join Date: Aug 2004 Posts: 3	Heater Blower motor always on Hi, I recently purchased a 1982 GMC 7000 (5 ton dump and 4ton HIAB crane). The interior is pretty much the same as a regular GMC pickup. The blower motor connector was disconnected, after I hooked it back up I found out why It is always on (with ignition on). Even with the fan setting at "low" and the temp slider to off. Any ideas? thanks. greg

08-02-2004, 11:36 AM	#2
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	the fan switch on the dash may be shorted out. Try unplugging it with the blower connected and see if it stops. __________________ 1974 Jimmy- 5.3/4L80e/NP241

08-02-2004, 02:13 PM	#3
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	That is the way they all are it always runs most people unplug it in summer. I ran a toggle switch to mine so I can switch it off and on. As far as I Know all the chevys are that way at least all the ones I have ever seen. __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

08-02-2004, 06:11 PM	#6
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	The wire the you pull out from the motor in the engine compartment I just cut it and ran a switch into the cab. __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

08-02-2004, 08:03 PM	#8
screwballl Tonawanda 454 Join Date: Mar 2004 Location: Liquid Sunshine State Posts: 2,755	i seem to have the problem of it NEVER coming on, even with a new blower motor... no matter where the switches are set to its never on.. it used to work (but only through the floor vents, it never moved from there). __________________ 91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!! 04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. -------------------

08-02-2004, 02:33 PM	#4
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	its to help keep fresh air circulated since these trucks have such "great" cab sealing. they thought we would suffocate without air coming in hahahah

08-03-2004, 02:24 AM	#11
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,088	My blower motor isn't always on. Am I missing something here? GM did make a "flow through" cab - if you are moving, air is pushed through the front cowl through the floor vent to the vents in the bottoms of the doors. That is why there are vents in the bottom of the doors. __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

08-03-2004, 05:08 AM	#13
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	My truck blower turns off If I turn it off. Had a 78 Coupe Deville that always ran if the key was on. __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

08-03-2004, 05:23 AM	#14
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	I think the A/C-equipped GM vehicles had them run all the time so the A/C wouldn't ice up. Or maybe so they would wear out faster & they could sell you a new one.

08-03-2004, 02:38 PM	#15
76sierraclassic Senior Member Join Date: Feb 2004 Location: White Hall, AR Posts: 316	Mine's always on in my '76. It used to blow out the regular vents until I changed out my heater core, and now it blows out the floor vents. I don't know what I changed, but it must have been something. Mike

08-04-2004, 02:16 PM	#16
Greg Carter Registered User Join Date: Aug 2004 Posts: 3	Thanks for the replys. Sounds like it may function that way.

08-04-2004, 05:03 PM	#17
Zilverado Account Suspended Join Date: Nov 2002 Location: Winnipeg, Manitoba, Canada Posts: 798	My '77 (non-A/C) was an "always on" set-up. My '86, A/C truck actually turns off. Funny, I'm not suffocating

08-05-2004, 01:39 PM	#19
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	The fan switch is set to be "always on" for the non-A/C trucks. A/C trucks you can turn the fan off. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

08-09-2004, 02:47 AM	#20
Justins76 OutOfMyMind & I'llNeverKnowWhy Join Date: Apr 2004 Location: Another world, some other time Posts: 672	The fan is always on on my 76 with factory A/C. Rather annoying to say the least. I even replaced the relays. Off means off! __________________ -Justin-Out of my mind and I'll never know why 1976 Chevrolet Silverado C10 350 4bbl / TH350 Big10 longbed 1986 Pontiac Firebird T-Top 5.0L TPI 700R4 WS6 1992 Pontiac Firebird T-Top 5.0L TBI 700R4 My cardomain page I don't like to save, it's more fun to spend!!

08-09-2004, 03:03 AM	#21
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	I haven't had my heater fan hooked up for a long time now, but my heater and defroster still work just fine. Just takes a bit longer, hehe __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)



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