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NAZglen
Samba Member
Joined: October 07, 2019
Posts: 126
Location: Prescott Valley, AZ.
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 Posted: Sat Nov 12, 2022 7:00 pm Post subject: Fresh air box delete |
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Has anyone deleted the fresh box on a 70 bug?
I am running 1 1/4" CPVC pipe from the heater channel up to the trunk, then foil taping the 3 way adapter to the CPVC.
Connecting the side vents on both sides will be easy.
The problem will be adapting the center vent that fits into the fresh air box to the paper heat/defrost hoses that has me worried. |
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baldessariclan
Samba Member
Joined: October 14, 2016
Posts: 1379
Location: Wichita, KS
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| Posted: Tue Nov 15, 2022 8:39 am Post subject: Re: Fresh air box delete |
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I'd be hesitant to use any sort of plastic piping in a VW Beetle's heating system. Since the heated air comes directly from the exhaust heat exchangers, it can reach temperatures far in excess of what a water-cooled engine's heating system could produce -- perhaps high enough to cause softening or even melting of the plastic, along with potential for nasty / noxious fumes from the heated plastic as well.
_________________
1971 Standard Beetle — fairly stock / driver
baldessariclan -- often in error, never in doubt...
Last edited by baldessariclan on Tue Nov 15, 2022 9:44 am; edited 1 time in total |
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Gitchigumi
Samba Member
Joined: November 24, 2011
Posts: 229
Location: Peterborough Ontario, Canada
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| Posted: Tue Nov 15, 2022 9:14 am Post subject: Re: Fresh air box delete |
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Don't know about a1970 air box, but if its like the one in my 75, the centre vent does not connect into the fresh air box. It is plumbed to the 3 way Y connector with plastic ribbed flexible hoses, one from either side. Fresh air is supplied to the same vent openings as the defrost air is.
Parts are available from CP-1 if you need them. |
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NAZglen
Samba Member
Joined: October 07, 2019
Posts: 126
Location: Prescott Valley, AZ.
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| Posted: Sat Nov 19, 2022 6:21 pm Post subject: Re: Fresh air box delete |
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| Thx. for the replies. Since the bug was stripped and missing a lot of parts I was guessing about the defrost system. I finally found some exploded view pictures that show what you are talking about. |
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viiking
Samba Member
Joined: May 10, 2013
Posts: 2668
Location: Sydney Australia
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| Posted: Sun Nov 20, 2022 1:07 pm Post subject: Re: Fresh air box delete |
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CPVC pipe has a much higher “softening temperature “ than standard(uPVC) plastic pipe. It is used for hot water up to 90C or 200F.
There are already plastic parts in the defrost system which were not CPVC and are still intact after 50 plus years. Whilst the temperature of the exhaust is high, the temperature in the heat exchangers is relatively low due to the large air flow the fan delivers.
So I’d say the heat won’t be a problem but with all plastics I can’t answer the question on smells/fumes as there are plasticisers in the plastic which can be leached out.
_________________
1968 1500 RHD Lotus White Beetle since birth. In the hospital for major surgery
1966 Lancia Flavia Pininfarina Coupe - in the waiting room
Discharged: 1983 Vanagon, 1974 1800 Microbus,1968 Low Light,1968 Type 3 |
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