The Type 2 Heating System Explained...
My apologies in advance if this is a long scrolling page... it's a long scrolling topic!
I refuse to drive anywhere wearing four pairs of socks, thermal undies, three jumpers and a woolly hat. That's why one of my first priorities when we bought Daisy in 1998 was to get her heating sorted. None of it worked, so all of what follows is based on extensive personal experience. The reason why many people are so confused about this subject is that many vans are bought without an owner's manual and neither the Haynes nor the Peter Russek VW Transporter manuals go anywhere near the amount of detail required for the average home mechanic to figure this out. In fact, most garages haven't the faintest idea how the heating in an air-cooled beetle or van works - so be warned: you will be paying their hourly rate for them to teach themselves how!
it works like this. Air is circulated around the heat exchangers which warm the air from heat off the exhaust manifolds. It is pushed towards the cab by both air pressure and at least one fan. That's it! The diagram shows how...
However, please note that your van will be best served with an exhaust system that retains all of the above components, and performance of your van's heating will be best improved using original equipment. I know that normally means 'more expensive', but the best things in life aren't cheap but they're worth it!
On your dashboard you have three levers, two with a red knob, one with a blue one.
The heater cables are a bugger to get to underneath the dash, especially if you are 6'1" and 18 stone and no good at Houdini impressions! However, I did it, so I guess you can too. The cable inners are connected to the heater control levers via the loop in the top of the cable (see diagram) and a circlip to hold them in place. When fitting these cables do not put any kinks in them - they are solid cable, not braided, and any kinks will make them difficult to operate once fitted!
All three cable outers are clamped to a bracket under the dashboard. If this clamp is missing you can almost forget your heater controls. It is imperative that under normal operation the cables are securely clamped in place. I tried various methods (mostly unsuccessful) until I was able to source a clamp from a VW breaker's yard which, 12 months later, is still in place.
It really is best to do the rest of this job with the van up on blocks or axle stands as, unless you have a radically raised baja van, there simply isn't enough ground clearance to get all of these jobs done properly. If, however, you are 4' tall and weight 6 stone, you could do it without the above (but how you got that driving licence, junior, is beyond me)!
When fitting new cables, note the precise route the originals took behind the kick panels and through the cab floor as this will make it far easier for you to fit the new ones. You will have to remove the stone guard underneath the cab to get to the main cable guides. These carry the cables to the rear of the van right to the heater elbow operator levers, and this bit is a doddle.
Once the ends of the cables have been fed through the guides, you have to feed the end of the cable through the heater elbow lever. It is best to do this with the concertina heater tube removed (see main diagram - just forward of the elbow) as this will allow you to determine where, eventually, to clamp the cable. It is easier to do this with two of you, but I did it on me own just to be awkward! Pull the left-hand heater control all the way to the bottom, i.e. in the full on position. Then get back underneath the van. Insert the clamp screw into the end of the heater elbow lever and feed the end of the cable through the clamp screw. Now, with one hand, pull the heater elbow lever until the flap inside the elbow is in the fully open position, and with the other hand (obviously grasping the appropriate screwdriver/spanner) tighten the screw clamp, making sure that the cable is fully pulled through and straight.
Note: some people have mentioned that their newly supplied cables weren't the right length. I found this to be the case as well, although the part numbers were definitely correct for my year. In my case I just snipped off the metal moulding at the end of the cable and tightened the clamp screw around the cable itself. The most important thing is that, with the other end of the cable firmly clamped at the dashboard end, the cable outer cap at this end is between the end of the cable guide and the furthest forward movement of the elbow lever. Make the clamp screws part of your routine checks - you'll thank me for mentioning it!
Now return to the cab and move the lever fully into the up position and, underneath the van again, check that the flap is in the closed position. Depending upon the snug fit of the cable, there may be a slight gap, and this will mean that there may be a trickle of warm air into the cab when the lever is up. This is where you play around with small adjustments to get it just right. Now do the other side and that's your heater controls set up. The only way to test it is to run the van (or fit a reverse blow vacuum cleaner to the system to blow air through).
Finally, there is the short cable that controls the footwell heater vents. This is going to be difficult, not because it's a pain to fit, but because it's going to be nigh-on impossible to source a new cable. I still haven't managed to get hold of one two years later, so don't hold your breath. However, I have simply locked the flap inside the heater tube in the up position so that whenever I turn my hot air on it hits my feet first (this suits both me and Dannie just fine). The cable itself, if you manage to get hold of one, appears to be simple to fit - nothing as complicated as the other two, so at least that's a relief!
I have either experienced the following problems myself or have helped friends discover them in their own vans. They can result in poor or no heating at all in your van - get them sorted and you'll have a much warmer journey:
I hope this article helps some of you prevent frostbite this winter!
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