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Tech/Performance/Info >> Air Conditioning & Heating >> Heat barrier question
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Message started by 77vette on Jul 19th, 2012 at 6:56pm

Title: Heat barrier question
Post by 77vette on Jul 19th, 2012 at 6:56pm
Dale, and the extremely hot weather, helped me decide it time to get around to fixing the A/C in the 77. I figured the the first step would be to try and reduce more of the heat that enters the passenger compartment. I have put a manual shut off valve in, placed a heat barrier under the carpet and placed new seals in the heater box. My question is this, would adding more of the heat barrier up behind the heater box and around the duct work help or would it be over kill that would just be a waste of time and money? If it would be beneficial, what type barrier would you us?
Ron

Title: Re: Heat barrier question
Post by Knotacare on Jul 20th, 2012 at 4:21am
This is what I use & it works. Easy to install & with the aluminum tape it looks great. The more you cover the floor area the better. I also installed a barrier on the underside of the tunnel on the 68..that BB gets hot :-X There is a big difference after you install the barrier.
http://hushmat.com/NEW_Performance.php
Alan [smiley=beer.gif]

Title: Re: Heat barrier question
Post by 77vette on Jul 20th, 2012 at 4:37am
Thanks Alan, figured more would be better just wish I would of done it when I replaced the heater box seals. Oh well another project, Will order a box.

Title: Re: Heat barrier question
Post by TX 73 stock on Jul 20th, 2012 at 6:09am
I need to do that too cause I'm gonna install a new system in mine next month with C4 blower and everything and might as well limit the heat as much as possible. you guys may have the temps that I do but add the humidity in Houston and the heat is just relentless.

Charlie

Title: Re: Heat barrier question
Post by 77vette on Jul 20th, 2012 at 6:38pm
This has been an unusual summer for us, with the lack of rain the humidity has been non-existent. The 100 degree plus weather is whats doing us in.
Went to a cruise the other weekend and the temp was 100+ and we added the slow moving vehicles and lack of air flow the water temp was around 220 made us feel like we were driving in a oven.
Decision to fix the A/C was an easy one.

Ron

Title: Re: Heat barrier question
Post by blue 77 on Jul 22nd, 2012 at 12:06pm
Good luck, Ron.  One of these days I plan to actually get mine fixed, I hope. ::)

Dale

Title: Re: Heat barrier question
Post by 77vette on Jul 22nd, 2012 at 2:20pm
Dale, picked up the heat husematt that Alan recommended at the local auto body store. When I took everything out I decided to do some trouble shooting. Turned out the selector switch was bad so I replaced it with one my wife bought last fall. Now I have power to the pressure switch but the compressor won't engage, seems I am low of freon. At the reserve center where I work they have a a/c machine and told me to bring it in on monday or tuesday, they also have the ability to check for leaks. Hoping everything is good but I've read that the new 134A will leak out of the hoses. I also read an article that said in 2017 they are going to a new freon again.

Ron

Title: Re: Heat barrier question
Post by blue 77 on Jul 22nd, 2012 at 3:43pm

77vette wrote on Jul 22nd, 2012 at 2:20pm:
I also read an article that said in 2017 they are going to a new freon again.

R1234yf?  I been hearing this is the replacement for R134a.  It is supposed to be compatible with the 134 :-/ only better. ::)  For us R12 users we are going to have to change at sometime. :(

Dale

Title: Re: Heat barrier question
Post by 77vette on Jul 22nd, 2012 at 5:09pm
I'm sure, any way to get money out of the working class. Since mine is converted I shouldn't have anything to worry about? I just hope all the components are good. so I can move on to the next project.

Title: Re: Heat barrier question
Post by 77vette on Jul 22nd, 2012 at 5:16pm
here is the article, hope it helps someone else

http://www.allpar.com/eek/ac.html

Ron

Title: Re: Heat barrier question
Post by blue 77 on Jul 22nd, 2012 at 7:10pm
Ron, thanks for sharing the article.  Had not seen it, but have heard from other sources nearly all the points made in it.  '17 is still far enough away, who knows what will truly happen in the next 5 years. :-/  Guess we will just have to wait it out and see.  Certainly plenty of points to consider regarding AC work in the future.

Dale 

Title: Re: Heat barrier question
Post by TX 73 stock on Jul 23rd, 2012 at 8:19am
just like anything else, we adapt as well as we can. My wife heard that they are going to stop manufacturing the standard light bulbs as it's costing uncle sam too much money to make them. not sure how true that it but she buys a couple boxes every time she goes to the store so I should be good for 50 years. I know the shelf life on 134a is several years so if we can all accumulate 8-10 cans by 2017 then we should have enough to last a good while and then you can still get it on ebay if you really need it. there's tons or R12 on there.

Charlie

Title: Re: Heat barrier question
Post by 77vette on Jul 23rd, 2012 at 3:48pm
Well, filled the vette with freon and found out that the compressor leaked. Replaced the compressor vacuumed out the system and refilled. Had cold air until the compressor started locking up and the belt started slipping, any ideas?
put in 3 pounds of freon, is this to much?

Title: Re: Heat barrier question
Post by blue 77 on Jul 23rd, 2012 at 8:32pm
Ron, thought on the compressor would be are you sure it's good?  Three pounds of freon is the recommended amount for '77.  Compressor locking up and belt slipping makes me think compressor might be bad.

Dale

Title: Re: Heat barrier question
Post by 77vette on Jul 24th, 2012 at 3:52am
Wish I had more knowledge in how the A/C system works, I guess if it was easy I would of fixed it three years ago  ;D . I guess I'll do some calling today and see if I get any ideas. One thought I had is there might be a little moisture left in the system. Someone else thought I should of replaced the filter? another said replace the drier? Hate to just throw parts at it.
I purchased the compressor new, I guess its possible that it's bad coming out of the box. We all now that they don't build things like they use too.
On the positive side was nice to have cold air while it lasted  :)

Ron

Title: Re: Heat barrier question
Post by Knotacare on Jul 24th, 2012 at 4:33am
Replace the drier if you suspect any moisture in the system as the drier absorbs moisture & can cause the system to not function properly. You will have to have the drier installed  the system evacuated by a professional , checked for leaks & system charged. Then you should be good to go.
Alan [smiley=beer.gif]

Title: Re: Heat barrier question
Post by 77vette on Jul 24th, 2012 at 4:41am
I'll pick up a drier and filter (Not sure where its installed) and drop it off at the shop to be redone, if nothing else I be closer to a all new system  ;D . I'll keep you informed if it works, glad the people out in the shop refill and vacuum the system for free, well not free I am  sure it will cost me in the long run.

Ron

Title: Re: Heat barrier question
Post by 77vette on Jul 25th, 2012 at 3:42am
Figured out something was wrong with the new compressor, found metal shaving in the lines. Time for new filter and system flush and a new compressor again. The positive side is all new O-rings  :), I'm still money ahead, then knowledge I've gained and extra shop time "price-less".

Ron

Title: Re: Heat barrier question
Post by blue 77 on Jul 25th, 2012 at 5:23am

77vette wrote on Jul 25th, 2012 at 3:42am:
something was wrong with the new compressor

Ron that really sucks.  Sorry to hear it but from your description of the problem I was afraid it might be the compressor. :o  Glad you are "enjoying" the "PRICE-LESS" part of this repair. LOL ;D  Good luck.

Dale

Title: Re: Heat barrier question
Post by TX 73 stock on Jul 25th, 2012 at 8:59am
we'all learning from this RON. maybe I won't salvage the compressor I have and go ahead and get a new one when I do mine. Maybe I can get a core charge out of it at least.

Hang in there,
Charlie

Title: Re: Heat barrier question
Post by blue 77 on Jul 25th, 2012 at 1:40pm
Ron, saw in your other post you found paperwork where PO coverted to R134.  Are you still using R134?  My statement of the system using 3 pounds of freon was assuming it was R12.  I seem to remember something about coverted systems using between 10% to 15% less R134 than R12. :-/ :o

Dale

Title: Re: Heat barrier question
Post by 77vette on Jul 25th, 2012 at 6:35pm
Charlie,
Recommend flushing the system, replace orifis tube (On the 77 its located on the small tub that has the thermostat on it, I replaced mine after the flush but that is where I found the metal shavings), replace all the seals (there really isn't as many as I thought), Vacuum system (Did mine for 15 minutes), let it stand for 15 minutes to ensure there are no leaks, Add freon 3lbs if its R12 and 20% less if its R134. If you replace pump don't forget to add the compressor oil, I changed the drier just to be on the safe side. Check to ensure the air is cold and enjoy.
Dale,
You have to find the positive if things aren't going right. Learned a lot from this repair. The parts store thinks the pump was bad from the start since the pump I exchanged was only leaking and no damage is evident from the inside. They say they will replace the pump free of charge but I have to wait for one to get ordered in, should be here in a couple of days. so really the only thing I am out is the orifis tub, flush since I used the oil and freon from work, and time. I figure this time I will add 2 1/2 to 2 3/4 pounds of freon and work up from there.

Ron

Title: Re: Heat barrier question
Post by blue 77 on Jul 26th, 2012 at 5:22am

77vette wrote on Jul 25th, 2012 at 6:35pm:
They say they will replace the pump free of charge

Ron, at least it's good they are going to stand behind the compressor.

Dale

Title: Re: Heat barrier question
Post by TX 73 stock on Jul 26th, 2012 at 6:44am
Thanks Ron. I'm converting mine to the late C3 so I don't have to use the VIR and am getting a parallel condensor and C4 blower so I'll be expecting good results out of mine. Ya know, I have one parts house that I always go to and am in there quite a bit and they always give me the benifit of the doubt if there's ever a discrepancy. sounds like you got a good one too and what they did for you would seal the deal for me.

Charlie

Title: Re: Heat barrier question
Post by 77vette on Jul 26th, 2012 at 2:32pm
Charlie,
I've done business with the same parts store for over 24 years. The only time I go somewhere else is when they are closed and can't wait for parts, normally they have whatever I need in stock.

Ron

Title: Re: Heat barrier question
Post by 77vette on Jul 27th, 2012 at 6:03pm
Well, new pump came in today. Flushed out the system with two quarts of cleaner, replaced the orifice filter, filled the pump with oil, replaced drier again, hooked every back up and I have air conditioning. Was real nice driving home. 
One issue down two more to fix: 1) window washer 2) cruise control, well there is the rear window defroster but I am not going to worry about that since I will probably never use it.

Ron

Title: Re: Heat barrier question
Post by blue 77 on Jul 30th, 2012 at 1:16pm
Ron, hope this one last longer than 2 or 3 days. :o  Glad you have A/C now. ;)

Dale

Title: Re: Heat barrier question
Post by Michael on Sep 11th, 2019 at 7:56am
The blower motor on my 1971 appears to have failed. Blows the fuse whenever the fan is turned on. Would appreciate any guidance on how to replace the motor.

Title: Re: Heat barrier question
Post by 68-73 on Sep 11th, 2019 at 1:07pm
It depends on if you have a SB or a BB with or with out air. A SB you can get it out from the top from the engine compartment. A BB from the side is easier. I did it from the top on both.
Alan [smiley=beer.gif]

Title: Re: Heat barrier question
Post by Michael on Sep 11th, 2019 at 2:16pm
I hate to sound like a dummy, but what are SB and BB. Car has factory air.

Title: Re: Heat barrier question
Post by 68-73 on Sep 12th, 2019 at 4:45am
SB means a small block engine 327 or a 350, BB is a 427,454 engine
Alan [smiley=beer.gif]

Title: Re: Heat barrier question
Post by Michael on Sep 12th, 2019 at 1:06pm
Disregard my last comment. Must have been half asleep when I read your reply.

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