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8/2/12 11:59am - Original Message: 'air/ht blower switch no air flow.'
Babyblue 78
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1978 Corvette Light Blue Pulled from the swamps of Miami! Its a driver and back on the road!

Joined: 12/3/2007
Posts: 262
In replacing the heater core, I am trying to check the ducts for airflow but not getting any response from the 3 speed blower switch.  Have a post on the dash removal as this is the project.  New heater core and now trying to check.
 
Fuse looks good,relay has power at the wires and clicking,power in 2 of the 5 wires that attach to the blower switch,
 
is the blower itself shot, any suggestions , I will check recent posts and the wire diagram.
 
BB78Shocked  This was to be a dash project but it is going in many directions????
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8/2/12 12:16pm - Reply: 'Re: air/ht blower switch no air flow.'
DaveM Lifetime Member
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Flanders, NJ - USA

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1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

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You may have to replace the resistor assy, it's on top of the motor housing in the engine bay.
Dave


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8/2/12 12:26pm - Reply: 'Re: air/ht blower switch no air flow.'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

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#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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Start with the simple stuff. You've already checked the fuse, so next is to make sure the fan is plugged in, and it has the ground wire attached to the metal part of the flange...and make sure that ground is nice and tight against the metal. It sounds like you have power to the switch, and the relay is working. IF the fan does not blow on ANY speed, I'd be looking at the fan itself...make sure it's plugged in, and has a good ground. Also, check for voltage at the fan connector itself...

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8/2/12 1:00pm - Reply: 'Re: air/ht blower switch no air flow.'
my7t1 Lifetime Member
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Dorr, MI - USA

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If you have a test light check the hot going to the blower motor. If it lights and you have ground it will be your motor. If the resistor is out, in most cases the motor will run on high but not on lower speeds.

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8/3/12 1:27pm - Reply: 'Re: air/ht blower switch no air flow.'
dwright Gold Member
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Victor, NY - USA

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Bring it to Carlisle August 24 and we will put the team on it. If you need parts you will find them at Carlisle.

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8/3/12 9:48pm - Reply: 'Re: air/ht blower switch no air flow.'
yostusota
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York, PA - USA

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1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top

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I like that idea!!

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8/5/12 6:54pm - Reply: 'Re: air/ht blower switch no air flow.'
Babyblue 78
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1978 Corvette Light Blue Pulled from the swamps of Miami! Its a driver and back on the road!

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Yes I would like to bring it to caslisle but Stern Smilewant to check the ducts and vacuums before I put the dash back on so need to bet the blower working first to check the ac controls and vacuum lines first.
 
Thanks for the info will do this weekend . Thanks, Mark
 
If blower is that good bad or ugly have not even had time to look at replacing it?


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8/9/12 8:28am - Reply: 'Re: air/ht blower switch no air flow.'
Babyblue 78
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1978 Corvette Light Blue Pulled from the swamps of Miami! Its a driver and back on the road!

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Ok the blower relay is clicking and I have voltage there,but the connection to the blower motor I have no voltage from the wires going into the blower. Put a test light on the grd and one connector I get a light but putting the voltmeter on the connection no voltage going into the blower from the wire connector. The relay clicks and cannot trace the wires that lead to the blower motor they are in a harness. Fuse at the fuse box is good power at the blower switch, but the final connection to the blower there is no juice in that wire from the harness? Bb78

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8/9/12 9:27am - Reply: 'Re: air/ht blower switch no air flow.'
my7t1 Lifetime Member
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Dorr, MI - USA

Vette(s):
71 Colonnade Hardtop Coupe Torch Red with black interior originally L48 built to push around 360hp

Joined: 8/21/2002
Posts: 2580
If the relay is good and you have no power to the connector, it sounds like a bad connection or broken wire from the relay to the motor. If the wires are color coded try checking for continuity between the connector and the hot coming off the relay. Or maybe splice a temporary wire between the two. You'll get it.

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8/9/12 2:31pm - Reply: 'Re: air/ht blower switch no air flow.'
Babyblue 78
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1978 Corvette Light Blue Pulled from the swamps of Miami! Its a driver and back on the road!

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Posts: 262
OK for the update, partly in the rush to get it back together I might have been testing the wrong part.  I think I ws looking at the relay that I guess goes to the a/c part and not the blower that is sort of under the fender.  The relay was working fine but I was not getting any power to the 4 prong plug that was connecting to the ac unit.  SO MY BAD BUT NOW LOOKING AT THE BLOWER, i ONLY SEE A 1 WIRE THAT IS ATTACHED TO THE FRONT AND IT LOOKS MAYBE LIKE A grond and then another wire with like a rubber bullet  shape and a metal prong inside but not attached to anything???LIKE I SAID THE BLOWER WAS WORKing a while back but I did not remove any wires.  The manual does just show maybe 2 wires to the blower but 1 looks like it goes through a capacitor for the radio???  I am looking at the electrical wiring chart and have not found a good look at the blower but cannot find where electric is going to it.
 
Also some have mentioned about a resiter not a relay and the book shows a resiter but I cannot find it or any wires from on to a blower???  It is tight to see anything much in there but will take another look and find the resister and if that rubber bullet type plug is the positive.  I cannnot get the vacuum door that is behind the blower to close either. I have good vacuum and no position on the controls will close that door in the well where the plastic fod net is.  I was trying to get the blower to work to assist in seeing if the proper doors close and open with the vacuum, before putting the dash back.
 
Ok will check thanks for the info, will try and find the resiter....


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8/9/12 4:25pm - Reply: 'Re: air/ht blower switch no air flow.'
my7t1 Lifetime Member
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Dorr, MI - USA

Vette(s):
71 Colonnade Hardtop Coupe Torch Red with black interior originally L48 built to push around 360hp

Joined: 8/21/2002
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The rubber bullet thing is probably your ground. It goes to a spade connector fastened to one of your screws that mount the blower motor to the heater case. Needs to be hooked up.

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8/10/12 9:10am - Reply: 'Re: air/ht blower switch no air flow.'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

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#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
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I don't know there, Mr. T....the "rubber bullet" sounds like the power wire connector to the blower. The ground usually only has a small rectangular plastic connector. The power feed to the blower usually has the larger, round "rubber" connector, so it will seal tightly to the blower motor terminal. Either way, if there is no power there with the key on, blower on High, then the fan ain't gunna werk.


Anyway....The relay under the hood, by the A/C box if the high speed relay...it ONLY powers the fan on High. The Low/Med/Med High blower power comes from the resistor in the air box. You can have a bad resistor, with no lo/med/med hi fan, but it should blow on High. If the relay is bad, but the resistor is good, it just wouldn't blow on high. Thumbs Up








|UPDATED|8/10/2012 6:10:58 AM (AZT)|/UPDATED|


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Joel Adams
C3VR Lifetime Member #56    
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8/10/12 9:51am - Reply: 'Re: air/ht blower switch no air flow.'
my7t1 Lifetime Member
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Dorr, MI - USA

Vette(s):
71 Colonnade Hardtop Coupe Torch Red with black interior originally L48 built to push around 360hp

Joined: 8/21/2002
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Adams' Apple said: I don't know there, Mr. T....the "rubber bullet" sounds like the power wire connector to the blower. The ground usually only has a small rectangular plastic connector. The power feed to the blower usually has the larger, round "rubber" connector, so it will seal tightly to the blower motor terminal. Either way, if there is no power there with the key on, blower on High, then the fan ain't gunna werk.


Anyway....The relay under the hood, by the A/C box if the high speed relay...it ONLY powers the fan on High. The Low/Med/Med High blower power comes from the resistor in the air box. You can have a bad resistor, with no lo/med/med hi fan, but it should blow on High. If the relay is bad, but the resistor is good, it just wouldn't blow on high. Thumbs Up




I Stand corrected bro. By the great illustration the spade connector with the rubber is the power. I was thinkin it was going to a mounting screw. The resistor info is right on.

Sorry bout that. Good thing ya dint hook up the power wire to the ground.

I'll shut up now. Stern Smile












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8/10/12 1:51pm - Reply: 'Re: air/ht blower switch no air flow.'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
Yeah...me too....LOL NOT! LOL
Sounds like a break in the wiring between the switch and the blower somewhere...


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Joel Adams
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8/10/12 5:29pm - Reply: 'Re: air/ht blower switch no air flow.'
Babyblue 78
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1978 Corvette Light Blue Pulled from the swamps of Miami! Its a driver and back on the road!

Joined: 12/3/2007
Posts: 262
Ok I will try to keep short. Thanks for the photo's.
 
My front is different than yours. I have ac if that is the difference.What I am seeing is  one wire with a plastic clip on the metal connector shown on your picture.And then I have the rubber connection which then goes to a radio resister and then connected to one screw for grounding and then its not connected to anything?
Trying to find the harness connection for this purple rubber tipped male connection, it has a rubber connectionat the blower and then a rubber connection after the resiter and then to the harness.Purple. and the plastic female connecter connected to the male metal connter sticking out of your photo. But no power.
 
I have power at the relay and it works took it apart it is working.I do not have power to the wires that connect to the resister going into the ac black box so can't test the resister, and testing any wires purple or the one connected to the front of the blower there is now power in any wire, so if I can get power to the resister maybe I can proceed, need to check where power comes from the harness to the resister and where I can trace that back to existing power so that is where I am!
 
From what I see the purple comes from the hi blo relay which is working and has power to blower motor but when testing the purple wire no power!
 
If the purple is power, on my blower the purple is connected to the blower screw and radio resister and then the rubber connection on the lower right of blower, so then what is the female connecting to the male metal connector on your photo,its not the grd and not the power????


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8/10/12 8:27pm - Reply: 'Re: air/ht blower switch no air flow.'
Babyblue 78
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1978 Corvette Light Blue Pulled from the swamps of Miami! Its a driver and back on the road!

Joined: 12/3/2007
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Anybody want a corvette before I torch it! 2 things 1. I hot wired from the relay wire to what I thought the pwr was purple and it ran so grd is good just have to find where the pwr is bad like I said no pwr at the plug that goes on resister plug in ac housing? 2 should there be power in the wire that goes to the fan switch? Is that why no power at the resister plug wire? 3. I need a simple diagram to tell me which ports go to what color vac hose on ac/ ht selector the right diagra are not working to what I select checked colors b it can't make sense of 1 to 5 ports no matter which way I looks at the switch don't seem to match picture and are not labeled 1 to 5 . Done for the night..... Thanks bb78

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8/11/12 7:38pm - Reply: 'Re: air/ht blower switch no air flow.'
Babyblue 78
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1978 Corvette Light Blue Pulled from the swamps of Miami! Its a driver and back on the road!

Joined: 12/3/2007
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I agree the relay has power to blower in high but the resiter not getting any juice,and no juice to switch. I MUST trace the wiring back to the fuse from that harness.  It had been working but not recently, and the wire jungle by the fuse needs to get cleaned up.
 
Thanks again for the info
 


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