Engine Cooling and Cabin Heating System Tutorial

[Fair-cooled]

[RWK]

I'm using one of these TC's in a bus project, they also sell bolt on and stem type TC's

http://thesensorconnection.com/category/cht-sensors/all-cht-sensors

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73 Type 181
63 Type 113
63 Type 261- 428 071
62 Type 241-378 025 178 530

[Fair-cooled]

This is an excellent tutorial on all things related to Beetle heating, engine heating and cooling, and how it all works together. The most interesting part for me was learning which vents to close when windshield heat is paramount as well as how to monitor the condition of the thermostat.
I’m hauling my engine out this summer to change my transaxle, so I will
be checking everything on the engine, including the heating/ cooling system. I only wish there was a cylinder head temperature gauge that fastened to the cylinder head without using a spark plug to hold it in, because I sort of think that after several plug removals there is quite a chance of the heat transducer
on the wire end would break open. But it’s been a fantastic learning experience and with be serving me well soon!

Thank you for your efforts Paul.

Darren.
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‘74 Super beetle, originally from California until 5 years ago.

Seize the day...not the Engine...

[Paul Windisch]

Awesome, thank you!
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*ASE Recertified Master Automotive Tech*

1984 Mexican Beetle
-1914cc
-L3 Heads 35x32 valves 52cc chambers
-0.040" deck for about 9.1:1 Compression
-Engle W110 cam
-CB Super Stock 1.1:1 Rockers
-Stock Heat Exchangers w/ Tri-Mil Muffler
-Dual Weber IDF 40s w/ 26mm venturis
-034 SVDA Distributor

2013 Chevrolet Volt DD
2005 Pontiac Montana SV6

MAHLE Service Solutions
Applications Engineer

[AlmostHeavenWV_VW]

Corrected Jbugs heater system diagrams:

and one I cobbled together from Wolfsburg West's parts diagrams to show most of the system pieces/parts

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1973 Standard Beetle
1600DP AK case
Solex 34PICT3 Carb
Bosch DVDA 205AJ Distributor

[graph]

Thank you, great write up!

[Tom K.]

Weighing in a few recent issues. '70 vert. I also have the large rectangular hole on the driver' side - it was a big help when replacing the main wiring harness last winter. It look sfactory. The passenger side has a small circular hole. Used both holes to spray fluid film in the areas for rust protection.

Regarding the y-pipes. Just last week I found them on the Samba classifieds. Two different sellers (for left and right) - about $20 for each. Flaps work on both, and both had the original insulation and straps. Found the bakelites too and the bellow tubes.

Samba has everything you need - good info and good used parts.
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'91 Vanagon Westfalia
'70 Beetle Convertible
'71 Super Beetle Semi-Automatic: https://www.thesamba.com/vw/forum/viewtopic.php?t=714131&highlight=
'65 Ghia: https://www.thesamba.com/vw/forum/viewtopic.php?t=762478&highlight=

[AlmostHeavenWV_VW]

Found these on Jbugs which illustrate the heater channels and the heater lever functions pretty well:

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1973 Standard Beetle
1600DP AK case
Solex 34PICT3 Carb
Bosch DVDA 205AJ Distributor

[Patty B.]

I replaced my driver side heater hose in the A pillar over the summer--I didn't need to enlarge the hole at the bottom but did use it to vacuum the space then check the tube was well seated. I was able to get my hand down there, skinny arms, to clean and tear the old remaining tube stuck on the outlet --I did manage to get scratched up on the screw and tack tips but no big deal.
The hardest and more frustrating part to me was rerouting the new tubes at the top including the fork --the twist and pressure fit aspects of each hose is there for a reason as with some the is room to twist on and other to push fit in their order--I think I tried them all lol. Now I have heat at the driverside window!
It's not a hard job and like any job it takes a bit longer than you might think if you haven't done it before.

[AlmostHeavenWV_VW]

[Wayne S. Johnson]

Dual heater fans. 90° flex drain couplings are the same size as the hot air ducts and the Bosch blowers.

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HYBRID STARTER 6/12 https://www.thesamba.com/vw/classifieds/search.php?username=Wayne+S.+Johnson
Additional products with Bluetooth http://www.thesamba.com/vw/classifieds/detail.php?id=2097231

[octavioadrian]

I am new to the beetle community! Thank you for this information. I have a lot of work to do on my 1970 Beetle that I just purchased. It is nice but the previous owner covered/hid A LOT of items on the car to make it look nice. The fresh air hoses where installed but not all the way to the heater exchanger. I was looking for answers on how to connect them. Thank you. Now I just need to find where I can find a WYE Pipe for my rear left side or how to modify a new one.

[Molly1973]

This write-up is excellent!

[HFOAIE]

About getting a new defroster hose down into the A pillar. I had to do it a long time ago, and I don't remember it clearly, but for starters, it goes in from the top. I think the holes at the bottom are inspection holes so they could see at the factory how the hose was lining up and going on. The cardboard hose has a spiral pattern, which acts like threads on a screw. Use It. I think it took some careful pressure besides the screwing action. I suspect that the factory may have used an appropriate lubricant to help. You know, those defroster hoses were probably the only reason nobody wanted Volkswagen after WWII, but some British chap must have figured them out, and that's why the British army kept VW going.

[67rustavenger]

Search "rear seat support bar" in the classifieds. There are 5 adds that I found.
Good Luck.

[mochito441]

[BWingate]

I'm working on my '74 SB Convertible. Its a bit of a frankenbug with an older replacement of the floor pans and other bits that I'm discovering.

The heat mostly works, but the defroster feels weak and lukewarm. (I think it is partially from the fresh air box flaps not being completely closed)

I'm reading up on everything before I dive into this on the weekend, but I'm trying to figure out how the defroster cables are supposed to route. On the driver's side, I have a floor vent with a tab that lets me open and close it. On the passenger side there is no tab, but there is a cable running forward to the foot well and then back (looks like a bike brake cable). I have not traced this cable completely.

Is this supposed to work the passenger floor vent?

Is it supposed to go back to the rear seat vents?

How are the cables supposed to route to the rear seat vents? Straight back along the tunnel? Around the front? Something else?

Thanks,
Bruce.

[air-h2o-air]

[Lingwendil]

here is a build that shows excellent cross sections of stock style heat exchangers, for those that are interested...

http://www.thesamba.com/vw/forum/viewtopic.php?t=5...;start=140
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73 super beetle thread http://www.thesamba.com/vw/forum/viewtopic.php?t=649622 Back on the Road!

Modify your Kadrons for SVDA http://www.thesamba.com/vw/forum/viewtopic.php?p=8115884#8115884

Cast iron VJU4BR8 SVDA reference thread- https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0

Need replacement filters for original Kadron aircleaners? WIX #42087 is a perfect fit, as is Napa Gold #2087!

[Cali_Army_Guy]