Show me your heater blower Y splitter set up Options

[DC_neun_vierzehn]

I bought AA's heater blower update kit with the Y splitter and installed it over the weekend. The hose that goes over to the passenger side is very long. I'm interested ins seeing how others have that hose secured as it goes over the engine from the motor to the passenger side.

I'm guessing zip ties are used? My fear is that having it loose and flopping around in the engine bay, it could get sucked into the cooling fan (and it just looks bad).

If you have this set up, please kindly share a pic of how you ran that hose from the motor to the passenger side?

TYIA

[wonkipop]

i think there is some kind of idea out there that the y set up and twin hoses was an official option.

i can find no evidence of that what so ever when searching parts manuals etc.

what i can find is that early 914s had the VW 411 set up with a more or less central fan and two hoses from the 4 and 2 door 411 sedans. and i believe in 73 it reverts for 914s to an adaption of the 411/412 variant (squareback) set up where they just use one hose biased to the drivers side - primarily for defrost of windscreen which is all the fan really needed to do.

i think what happened is that dealers maybe, and certainly those in the know, knew was that you could use the VW 411/412 variant fan hose splitter to do a twin hose set up on cars post 73.

but as i say i can find no evidence factory did it.

all the parts to do the twin hose post 73 set up are from the VW 411 variant
they did not need to worry about the hose blocking the fan in the VW model because the fan was sealed into a boot for intake air. the heater blower hose was draped over the top of the boot.

and in the earlier twin hose set up with central fan the fan was mounted high and centrally off a bracket that kept both fan and hoses clear of fan intake.

i would never personally want to do a twin hose set up on my 74 1.8.
that hose lying there definitely compromises cooling intake air flow.
and i live in a hot country.

here is the VW 411/412 variant set up.
what post 73 914s had was a special adaptor for the fan that went from single rectangle to single circular. to do the twin hose set up on a 914 you used all these VW parts.
i believe there was a circular clamp used to hold those up above the fan casting and it bolted to one of the fan casting bolts.

[87m491]

I hear you. But as someone just rehabbing a non working and incomplete heat set up, (and trying to figure out the intended flows of hot air) why would Porsche go through the trouble of routing a hot air path along the passenger side of the car, back to front, if it wasn't intended to be used at some point?

i think there is some kind of idea out there that the y set up and twin hoses was an official option.

i can find no evidence of that what so ever when searching parts manuals etc.

[wonkipop]

I hear you. But as someone just rehabbing a non working and incomplete heat set up, (and trying to figure out the intended flows of hot air) why would Porsche go through the trouble of routing a hot air path along the passenger side of the car, back to front, if it wasn't intended to be used at some point?

i think there is some kind of idea out there that the y set up and twin hoses was an official option.

i can find no evidence of that what so ever when searching parts manuals etc.

well - this is what i think - which i thought i explained.
they went for the single hose set up in 73 not to cheapen the cars but to deliberately bias strongly the heat flow when the fan kicked in (Which is only at the full rotation of the heater lever).

the fan itself is the same power / flow as the earlier twin outlet fan but instead of a flow each side that is equal, the total flow was directed to one side - the driver side, to quickly defrost/demist the windscreen in front of the driver.

i believe the single hose set up is in fact porsche or VW as the case may be making an improvement in 1973 on. its a deliberate design move.

all the booster fan parts are VW parts from the type 4 parts bin except for one piece.
the single adapter plenum that comes off the fan the single hose connects to.
that one is a 914 part. only used on 914s from 73 on. made special for 914s and not out of the VW parts bin.

earlier cars pre 73 had the whole fan blower system as a straight lift off the 411 sedans.
complete.

later cars used the variant fan which was a single outlet fan. but they did not use the variant splitter.

even air flow at full boost with the electric fan operating worked well for the bigger VWs with larger cabins. but i believe for the 914 they found it worked better to bias it in the smaller cabin and to get the screen cleared faster.

i don't think its a design mistake or an economising measure.
its deliberate in its intent.

if your heater box valves are working properly there should be good heat flow down the longs evenly on both sides with the lever partly up. of course like all aircooled VWs its entirely dependant on engine revs as the airflow is purely from the fan casting bleed flaps at the bottom of the fan casting.

i find the heat flow entirely sufficient and rarely would i pull the heater lever fully up.
but i do live in australia and it rarely gets cold in the true cold sense like north america.

interestingly the few type 4 VWs down here, most of which are private imports from south africa, none are fitted with the extra blower fan set up. just not needed. they all have the standard VW method of pure air bleed from the cooling fan.
same goes for the type 4 engine buses down here. unlike north america not fitted with the additional electric blower fan in the engine bay.