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Username Post: Another 66 A/C question or two        (Topic#361016)
Gilly 
Contributor
Posts: 194
Gilly
Reg: 09-29-15
05-18-20 03:18 PM - Post#2794136    

My brothers car again. 66 Impala non-SS convertible, 396 Turbo 400, factory AC car.

We got it on the road last year, he did skrimp on some needed work including installing AC components. So we're going down that road with it now and making progress.

Question is last year without the AC, it just seemed really way over the top hot in the car. Brother can't put his finger on where the heat is coming from. To him it's just hot. He's thinking about installing a heater hos shut off. I am trying to slow him down on that idea, just too many variables, so I asked him for some other details to share with you.

He had the plenum out, it was down to the bare body pretty much. The flaps were rusty, there was some thin foam in there he doesn't know where it came from. There was (heh, "was") a plastic flap in there that broke, he didn't really worry about. And I know we never tested the vacuum-operated flap over on the right side (I think is a fresh air flap), nor what it means if that doesn't work.

So to me there is a bunch of things which may be contributing to his hot-feeling interior.

Any suggestions or point me to a good diagnosis?Any of this sound familiar?
Gilly



 


docjns1 
Gold Supporting Member
Posts: 85
docjns1
Loc: upstate NY
Reg: 11-12-19
05-18-20 04:47 PM - Post#2794143    
    In response to Gilly

Basic question(s) 1st...Is there hot/warm air coming from or through the heat/AC/defroster vents? If so all the flaps and doors should be checked for operation and seals (often thin foam gaskets) to close off air flow through the heater core. The seal at back of hood on cowl should be there and in good shape also, not only to prevent engine heat from being sucked through cowl but deadly fumes as well. If none of these, and just heat build up in the passenger compt, exhaust system could be a contributing factor if the firewall, floor and carpet are not insulated. Otherwise just simply hot sun beating down on it...something I live with in a hardtop non-AC car with black interior!

Steve
*********
'65 Impala SS, Crocus Yellow/blk
327 / 300 L74
M11 3 on the tree
12 bolt 3.31 open dif


 
SixSix 
Senior Member
Posts: 324
SixSix
Loc: Mendota Heights, MN
Reg: 02-12-01
05-18-20 08:02 PM - Post#2794164    
    In response to docjns1

I have a 66 396, TH400 air ht. The AC has never worked, and have owned this car since 1986. It gets hot inside the car without the AC. Real hot. And the car is white. The exhaust gets the floor pan warm and heats everything up inside. The engine ran borderline hot for a long time but had a 4 row radiator built 20 years ago. That cured the engine from running hot, but the exhaust still cooks the floor pan.

Doing a mechanical restoration on it now and the AC will work.
I suppose you could use some Dynamat on the floors. I might try that.

Mark

1966 Impala HT 396/TH400/12 Bolt
1965 GS HT 4-speed - BCA Senior Gold 2015/AACA Senior 2017
1969 Bel Air 2 Door Sedan "Project Junior Stock"


 
SixSix 
Senior Member
Posts: 324
SixSix
Loc: Mendota Heights, MN
Reg: 02-12-01
05-18-20 08:06 PM - Post#2794165    
    In response to docjns1

Tried to delete 2nd post.

Mark

1966 Impala HT 396/TH400/12 Bolt
1965 GS HT 4-speed - BCA Senior Gold 2015/AACA Senior 2017
1969 Bel Air 2 Door Sedan "Project Junior Stock"


 
Gilly 
Contributor
Posts: 194
Gilly
Reg: 09-29-15
05-19-20 06:28 AM - Post#2794184    
    In response to SixSix

Thanks all. I wonder if it is mainly the floor? He didn't have an answer on where it's coming from either, so makes sense. I did interrogate him, you know, floor, dash vents. where is the heat coming from?
He did put down an extra layer of stuff under the carpet, not the silver stuff, more like a tar paper, really sandy feeling with plastic on one side? He is an excellent sheet metal fabricator, maybe he can make some sort of heat shield like newer cars have over the cats.
He is assembling the AC now, and is thinking of putting in a heater hose shut-off, I still wonder if that is required, or more like, will it solve the problem.



 
Gilly 
Contributor
Posts: 194
Gilly
Reg: 09-29-15
05-19-20 06:34 AM - Post#2794185    
    In response to Gilly

anyone know which flap is plastic in the ac heater box? I can search online too, but thought I'd ask if it was an especially important one



 
SixSix 
Senior Member
Posts: 324
SixSix
Loc: Mendota Heights, MN
Reg: 02-12-01
05-19-20 09:05 AM - Post#2794194    
    In response to Gilly

There isn

1966 Impala HT 396/TH400/12 Bolt
1965 GS HT 4-speed - BCA Senior Gold 2015/AACA Senior 2017
1969 Bel Air 2 Door Sedan "Project Junior Stock"


 
59fins 
Member #212 "19th Year" Gold Supporting Member
Posts: 2352
59fins
Age: 60
Loc: Surprise Az USA
Reg: 04-07-00
05-20-20 05:38 PM - Post#2794320    
    In response to SixSix



Attachment: 4D30A35A-6C38-482E-88E2-A7F9A0982A3A.jpeg (90.42 KB) 4 View(s)




Attachment: 8B482DF6-500C-4C7F-A945-7D3585EEE904.jpeg (92.5 KB) 4 View(s)




Bill H.
67 Impala SS




 
Gilly 
Contributor
Posts: 194
Gilly
Reg: 09-29-15
05-22-20 05:41 AM - Post#2794458    
    In response to SixSix

He's having a fit about the prospect of pulling the heater box again. Seems content with knowing it might be the floor and will monitor that.
Are you sure an AC heater box doesn't have a plastic flap? (vs a std heater box)
Thanks I do appreciate the replies.



 
junky 
Valued Contributor
Posts: 3438

Loc: Northeast CT
Reg: 06-27-10
05-22-20 10:21 AM - Post#2794482    
    In response to Gilly

Installing a heater hose valve isn't going to hurt anything, and it isn't that costly to find out if that is the problem. As for fixing the air conditioning so it will work, it going to take some time, expertise, patience, and money. If any one of those items is missing, then it would be best left for someone that knows how to repair the unit, and for him to pay that someone.

Never argue with an idiot. He'll drag you down to his level, then beat you with experience.


 
bigbowtielover 
Valued Contributor
Posts: 2583
bigbowtielover
Loc: Surrey British Columbia
Reg: 09-01-13
05-24-20 07:13 PM - Post#2794702    
    In response to Gilly

Heat can also be coming from transmission. My floor tunnel used to get very hot from transmission heat. My car had no carpet or insulation at the time, just bare metal with a thin coat of paint. No undercoating either. Trans had a street/strip torque converter so typically ran 200-ish degrees and also headers at your feet was a bit hot driving especially in traffic with no airflow to cool things off.



 
59fins 
Member #212 "19th Year" Gold Supporting Member
Posts: 2352
59fins
Age: 60
Loc: Surprise Az USA
Reg: 04-07-00
05-25-20 03:35 PM - Post#2794812    
    In response to 59fins

**See pics above**
The photos above are the heater side of a 66 looking from the outside of car, but this is setting loose in my shed, if you had the outside a/c box off, this is all you would see through the one square hole.

Bill H.
67 Impala SS




 


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