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#1 |
Registered User
Join Date: Oct 2007
Location: rockville, md
Posts: 257
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Heater Fan- Reg heater vs AC Heater
I'm trying to get my Heater Fan to work. Someone has put in a Non-AC controls and all of the wires are un-hooked. My question is , I'm trying to get the heater to work to get the windshield clear in the mornings. Can this be done by using the non-AC control? Most of the AC items are unhooked. I can feel heat (stays on all of the time) but how do I get the blower to come on and work? Let me know where I should start, Thanks,
TJ |
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#2 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: Heater Fan- Reg heater vs AC Heater
Your problem could turn into a project because of the way the AC blower is wired up. The three speeds all run through the relay which is over to the right hand side of the heater box. I am attaching a picture of the AC heater wiring so you can see where the relay is located. You will need to get power to the relay somehow unless it has been taken out of the circuit, also.
Take a look at your wiring and let us know what you have as far as the AC wiring. Another problem you can run into is the defrost is controlled by the diverter box so even if the blower is working air may not go out the vents. Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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#3 |
Registered User
Join Date: Oct 2007
Location: rockville, md
Posts: 257
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Re: Heater Fan- Reg heater vs AC Heater
Here's some pictures of the wires, let me know were they should go, TJ
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#4 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: Heater Fan- Reg heater vs AC Heater
Someone has left you quite a mess!
I don't know where to begin telling you what to do as the external AC wiring has been balled up with the other internal AC wiring and there is the extra wiring that someone has installed. I have never seen anything like what you have! Sorry, Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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#5 |
Registered User
Join Date: Oct 2007
Location: rockville, md
Posts: 257
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Re: Heater Fan- Reg heater vs AC Heater
If I can get a copy of the Schematics for the heater/AC controls, maybe I can figure it out. Where can I get this information for a 72 Chevy?
TJ |
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#6 |
Registered User
Join Date: Oct 2007
Location: rockville, md
Posts: 257
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Re: Heater Fan- Reg heater vs AC Heater
Jim,
How about the white plug in the last picture, where might this go? Let me know if you know more on the others, any answers would help. I trying to get the blower and heat to work for now, not worried about the AC TJ |
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#7 |
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: Heater Fan- Reg heater vs AC Heater
Here you go if you need more let me know as I just rewired my entire truck. For the AC there are vac lines and you also have three cables that control diverter doors for AC, defrost, and heater/AC vents
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69 Chevy 4x4 383 Power ![]() |
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#8 |
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: Heater Fan- Reg heater vs AC Heater
the orange wire goes where the cig lighter is in the fuse panel and then you plug the lighter into the orange wire. The grey wire does the same thing with the panel lights. You should install a 25 amp fuse in the cig lighter slot
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69 Chevy 4x4 383 Power ![]() |
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#9 |
Registered User
Join Date: Oct 2007
Location: rockville, md
Posts: 257
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Re: Heater Fan- Reg heater vs AC Heater
Got the Orange wire and Grey wire hookup today. Both seem to be working. The Light come on for the heater and I have juice from the relay (Orange ). Now I have to get a heater/air control unit because I only have the regular heater unit, seems my plug won't work because of the air setup. Also I took a hot wire from the battery post and touch the post of the blower but it won't work, maybe the blower is bad??? Question: is there a difference in the Heater vs AC Heater controls cables, are they the same?
TJ Last edited by tjvending; 01-12-2008 at 03:14 PM. |
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#10 |
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: Heater Fan- Reg heater vs AC Heater
You need to make sure you have a ground on the blower. If you look at the schematic it gets its ground from the relay along with the power wire. there is a seal on the blower motor that keeps it from grounding through the truck body. try a ground wire from blower housing to battery. As for the cables I don't know what the difference is but there are two different part numbers for them
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69 Chevy 4x4 383 Power ![]() |
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#11 |
Registered User
Join Date: Oct 2007
Location: rockville, md
Posts: 257
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Re: Heater Fan- Reg heater vs AC Heater
Had to relocate the ground wire like you said, with the hot wire touching it now fires up. Waiting on my Air-Controler to come in, hopefully everthing will work. Question:On the main plug that goes to the air-Control, should one of the wire be hot with the key on or does it just work when plug into the controler?
TJ |
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#12 |
Registered User
Join Date: Oct 2007
Location: rockville, md
Posts: 257
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Re: Heater Fan- Reg heater vs AC Heater
Receive my AC Contoller today, When I went to install the bolt holes under the dash won't match the holes in the Controller. Do you think its the correct one for the Chevy Truck? Should it match up with the two large holes on the underside of the dash? Next question. I plugged in the 4 wire prong and turned the key on and switch on the fan switch but nothing. What should I do next? I thinking I'm not getting any power to the 4 wire prong. Let me know my next steps. TJ
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#13 |
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: Heater Fan- Reg heater vs AC Heater
If you look at the schematic there is a #14 brown wire from the fuse panel to the switch (shown dash line) Make sure it was not in the other plug that you could not plug in. they may have used it to run the other controls. If you can't find it try running a fused wire from your Acc. switch to the terminal shown. If you have a ac cab and an ac controller the large holes will line up. You may have a controller from a later year. cant know without seeing it
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69 Chevy 4x4 383 Power ![]() |
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#14 |
Registered User
Join Date: Oct 2007
Location: rockville, md
Posts: 257
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Re: Heater Fan- Reg heater vs AC Heater
They did used the brown wire on the heater switch. Here's some pictures... Also of the mounting, it doesn't line up to my holes. TJ
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#15 |
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: Heater Fan- Reg heater vs AC Heater
Like I said earlier you need to reconnect the brown wire in its original spot or to the Acc side of the ignition with a 15 amp fuse. those controls don't look anything like mine. Mine has a metal bracket on the bottom of it yours is drilled in the casting. You may need to find the metal bracket if it is not on your heater only control. Here is a picture of what the face should look like and I'll try to get a picture of the bracket tomorrow. Your face is the same except it is white with black letters where mine is black with white letters.
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69 Chevy 4x4 383 Power ![]() Last edited by haysonj; 01-17-2008 at 04:09 PM. |
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#16 |
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: Heater Fan- Reg heater vs AC Heater
It's probably the resister that is inside the heater box. I doubt its the relay because the fan would not run at all. You have to pull the duct work to get to the resister. Make sure all wires are connected to it.
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69 Chevy 4x4 383 Power ![]() Last edited by haysonj; 01-18-2008 at 06:20 AM. |
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#17 |
Registered User
Join Date: Oct 2007
Location: rockville, md
Posts: 257
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Re: Heater Fan- Reg heater vs AC Heater
I replaced the resister with another, still same thing, comes on med 3rd click down. The one I just put in looks to be in good shape, the one I pulled was kinda bad looking, on its last leg. Another question on the plug that go into the controler. Should there be two yellow wire? Look at the picture, I have total of four wires, 1 Lt Blue, 1 yellow, 1 or, and the brown. TJ
Last edited by tjvending; 01-18-2008 at 07:58 AM. |
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#18 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: Heater Fan- Reg heater vs AC Heater
Change the switch on the control panel. They go out often.
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#19 |
Registered User
Join Date: Oct 2007
Location: rockville, md
Posts: 257
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Re: Heater Fan- Reg heater vs AC Heater
I just got the controller and was supposed to be totally rebuilt. That should included the switch, wouldn't you think? It came with the switch.
TJ |
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#20 |
Registered User
Join Date: Sep 2005
Location: Canton North carolina
Posts: 3,079
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Re: Heater Fan- Reg heater vs AC Heater
Change the switch. As far as your control itis correct but you need a bracket to adapt it to the dash. Don't worry this, was a stock thing so you are not the only one out there with this bracket. I will look and see if i have an extra, if I do you are welcome to it. I will check tomorrow and see if I do. If I do, pm me your address and I will send it to you.
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#21 |
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: Heater Fan- Reg heater vs AC Heater
Your other yellow wire is spliced in somewhere in the harness and goes to the switch for the AC compressor so you end up with a yellow at the resister and the AC compressor switch. You can take a short wire and jump the differant spades to the brown wire to see if its your switch
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69 Chevy 4x4 383 Power ![]() |
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#22 |
Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 734
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Re: Heater Fan- Reg heater vs AC Heater
Nice work. This thread is a good example of willing and patient guys assisting an earnest member who needs and deserves help. Thanks.
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CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp Last edited by CCCC; 01-18-2008 at 04:55 PM. Reason: spelling |
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#23 |
Registered User
Join Date: Sep 2005
Location: Canton North carolina
Posts: 3,079
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Re: Heater Fan- Reg heater vs AC Heater
I checked in one of my stashes today and could not find the bracket. I will chech some of my other hiding holes and see if I can find you one. I will let you know.
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#24 |
Registered User
Join Date: Oct 2007
Location: rockville, md
Posts: 257
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Re: Heater Fan- Reg heater vs AC Heater
Thanks, 71 super
Looks like I need one, also maybe a switch. TJ |
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#25 |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
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Re: Heater Fan- Reg heater vs AC Heater
Check the switch connector and the condition of the wires in it before you replace the switch.
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'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
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