Weak heater?
Thread Starter
Navigator
Joined: Oct 2005
Posts: 9
Likes: 0
From: Scottdale Arizona
Weak heater?
Let me start by saying I drive my 63 roadster daily. Some of these beautiful blue sky days get a little chilly with the top down and I can't bear to put it up. So on comes the heater and it doesnt do much. I don't feel anything with the **** pushed in. I can hear it but don't feel any air movement out of anywhere. With it pulled out I can feel it coming out of the defroster. Still not very strong or warm. Are the heater in these cars weak or do I have something wrong. Thanks, Dennis
Race Director
Joined: Oct 2005
Posts: 12,470
Likes: 1,548
From: Camp Verde AZ
C1 of Year Finalist (performance mods) 2019
2017 C1 of Year Finalist
You either don't have water or air flow thru the core, or air flow thru the heater box, or both.
Solve your air flow problem first, then once that is blowing good, check for temp.
GM cars in general have good heaters,a s long as air can get to/thru the core,and there aren't a bunch of air leaks between the heater box and the outlets.
Doug
Solve your air flow problem first, then once that is blowing good, check for temp.
GM cars in general have good heaters,a s long as air can get to/thru the core,and there aren't a bunch of air leaks between the heater box and the outlets.
Doug
Thread Starter
Navigator
Joined: Oct 2005
Posts: 9
Likes: 0
From: Scottdale Arizona
Thanks Doug. This is my first Vette and I love it but have a lot to learn. Where do I start in my evaluation of the blower? like I said I can hear it but it is weak.
Thanks
Dennis
Thanks
Dennis
Race Director
Joined: Apr 1999
Posts: 10,866
Likes: 717
From: Beverly Hills/Pine Ridge Florida
Hard to 'splain. You should get an Assembly Manual. Basically, within the heater box are a series of flapper doors. Pull the defroster...the door shifts and air goes to the windshield. Keep it closed...air comes out down by the floor and by the Lt. and Rt. radio panels.
Take off the radio side panels. Look around. Might have leaves, mouse nests, something plugging things up. You might have to resort to removing the entire interior heater box assembly.
Is the heater core hooked up or is it bypassed? If you've got no hot water flowing through the core, you'll get no heat. Chuck
Take off the radio side panels. Look around. Might have leaves, mouse nests, something plugging things up. You might have to resort to removing the entire interior heater box assembly.
Is the heater core hooked up or is it bypassed? If you've got no hot water flowing through the core, you'll get no heat. Chuck
Race Director
Joined: Feb 2004
Posts: 11,039
Likes: 2,591
From: Del Boca Vista FL
Another bugaboo on the 63 heater box is the mechanical linkage on the box itself. If original, it is a cam type operation and when you pull the **** out do it in a "crisp" manner. Don't try to rip the cable through the rear of the car but when you move the heat/defrost cable don't finesse it. Same when you push it in. You are operating a door on a hinge pin down inside the inner box and if you are lazy on the cable operation it will not move fully to the position you are wanting.
Rich
Rich
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,926
From: Washington Michigan
Heater operation requires use of BOTH *****; the "Fan-Temp-Pull" **** increases heater output air temperature as it's pulled out, but you won't get any heat unless the "Air-Pull-Def" **** is pulled out to its halfway "detent" position, which admits outside air to the the heater box. From the halfway "detent" position to all the way out, that **** changes function and diverts heater air output to the defroster. Check the heater operating instructions in your owner's manual.
Racer
Joined: May 2003
Posts: 391
Likes: 36
From: taunton mass
week heater
I could be wrong about a 63 , i had one years ago but I cant rember if it was the same as my 66 ,which has a 3 speed switch .This switch on my 66 has given me trouble,, in it only worked on low speed ,because of a broken wire on the blower motor under the hood ,the part that the wire is on looks like a condenser . Once I fixed it and got all 3 speeds I had all the heat I needed . I would turn the heater blower on with the car off and make sure you have 3 speeds before I started taking the heater box etc. apart . Hope this helps . jeff
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski