1977 Need Heater HELP!!
Thread Starter
Instructor
Joined: Oct 2007
Posts: 162
Likes: 0
1977 Need Heater HELP!!
Hi today while i was trying to fix my blower motor which is only staying on low speed and i realized air was blowing on me from under the hood when i reached my hand down through the fender/ dash area i almost cut my fingers off! the blower motor squirrel cage was right there!!! what cover do i need to render this problem?
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Hi today while i was trying to fix my blower motor which is only staying on low speed and i realized air was blowing on me from under the hood when i reached my hand down through the fender/ dash area i almost cut my fingers off! the blower motor squirrel cage was right there!!! what cover do i need to render this problem?
I'm confused. Where were you when you did this...inside the car or outside the car?
Did you reach up under the dash knee pad?
Burning Brakes
Joined: Sep 2005
Posts: 832
Likes: 0
From: Sarasota Florida
Navigator
Joined: Oct 2007
Posts: 9
Likes: 0
theres a door?
Its not huge but i could probably get two hands down in there, i reached from outside the car. Is there a door thats supposed to go there, i used foil tape for now but i would like to figure out how to do it right. the screen was in place and about 4-5 inches below that i touched the blower, blower is still where it should be. Also what wires do i jump to make my blower, well you know, BLOW. It stays on low speed, i replaced the interior speed switch, and i have a relay on order.
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Its not huge but i could probably get two hands down in there, i reached from outside the car. Is there a door thats supposed to go there, i used foil tape for now but i would like to figure out how to do it right. the screen was in place and about 4-5 inches below that i touched the blower, blower is still where it should be. Also what wires do i jump to make my blower, well you know, BLOW. It stays on low speed, i replaced the interior speed switch, and i have a relay on order.
There is a thing, I don't know what to call it, that's screwed down into the housing or air box, from the firewall side. It has terminals coming out of it. Pull it out and it has a spring winding through the various terminals and that's probably what's keeping your fan from working properly.
Thread Starter
Instructor
Joined: Oct 2007
Posts: 162
Likes: 0
still need help
can someone post a pic of this fresh air door and does anyone have on they can part with? So far i changed the switch and the thing that goes in the heater box with the metal springs and such on it. Only thing left is the relay, would that be my problem?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Drifting
Joined: Oct 2007
Posts: 1,317
Likes: 22
From: Marina CA
Usually when the resistor unit goes bad all you will have is high speed fan, sometimes you can have low and high or medium and high. Do you have access to the wiring plug for the blower speed switch? If so the brown (these are 68 colors) is the hot (power in) lead. If you jumper from it to each of the other 3 colors (one at a time) orange, brown and blue you should get 3 different fan speeds. If you do get 3 distinct speeds by jumpering the fan switch has gone bad.
Be careful sticking your hand down the fresh air side of the plenum as the blower cage is right there.
The resistor (1968 again) is on the backside of the heater housing so access is a bit tough. Patience and good flexibility required!
Be careful sticking your hand down the fresh air side of the plenum as the blower cage is right there.
The resistor (1968 again) is on the backside of the heater housing so access is a bit tough. Patience and good flexibility required!
Instructor
Joined: Dec 2004
Posts: 196
Likes: 0
From: holland pa
that "thing" on the top of the heater box (that durango boy mentioned) is the high speed relay, i would try to change that since you seem to have tackled everyting else. it may solve your problem.
...................................chris
...................................chris
