very strange

Posted: 6/2/07 8:01pm Message 1 of 6

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Redwingvette

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Waterford, MI - USA

Joined: 9/13/2002

Posts: 1749

Vette(s): 1973 Red coupe

My A/C blower started acting up today. First, it would not go into high, No problem, I'll check the relay. Then it wouldn't shut off even with the key off. Now I am starting to get a little pissed. OK, take a break. couple hours later and I start looking at it again only now everything seems fine. I close the door and it stops again. Open the door and it starts working. Hummm, Now I figure I should see what happens when I push in the door switches. Front switch, nothing, back switch (alarm) and it starts working. OK maybe I have a bad ground some where, put a meter on it and with the door closed the relay only has a few volts, open the door and I get the full 12 volts. Guess I am going to half to pull the console apart and see what gives. Always something to do to these old cars. Redwingvette2007-06-02 20:02:47

Brian - NCM Lifetime Member

73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System

Dewitt radiator and dual electric fans

Borgeson Steering box

very strange

Posted: 6/3/07 6:41am Message 2 of 6

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Redwingvette

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Waterford, MI - USA

Joined: 9/13/2002

Posts: 1749

Vette(s): 1973 Red coupe

Just as I suspected, a bad ground. After studing the electrical schematic and follow the wires around I found a ground wire broken off where it attached to the motor. Fortunately I found it before I started taking a bunch of stuff apart. Sometimes I need to walk away from a problem and come back later with a clear head. Redwingvette2007-06-03 06:45:23

Brian - NCM Lifetime Member

73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System

Dewitt radiator and dual electric fans

Borgeson Steering box

very strange

Posted: 6/3/07 7:21am Message 3 of 6

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SFVette

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Joined: 3/27/2006

Posts: 380

Hey Brian, sounds like a textbook example of diagnosing the problem and then solving it. Congrats on your patience, and persistence--it's a good reminder to me of how to approach the various issues we all have with, as you say, "these old cars"!

very strange

Posted: 6/4/07 5:08am Message 4 of 6

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Adams' Apple

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Duncanville, TX - USA

Joined: 11/8/2003

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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

Don't ya just love it when it turns out to be easy? Easy as in, you didn't spend three days on it just to find the problem?
Congrats!

Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

very strange

Posted: 6/4/07 3:02pm Message 5 of 6

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Redwingvette

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Waterford, MI - USA

Joined: 9/13/2002

Posts: 1749

Vette(s): 1973 Red coupe

Ya, especially cuase I must have broke the wire off when I was installing the new spark plug wires Friday night.

Brian - NCM Lifetime Member

73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System

Dewitt radiator and dual electric fans

Borgeson Steering box