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  #1  
Old March 5th, 2009, 06:18 PM
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grnrvrs
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Paul
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replacement heater blower motor

I'm in the process of rebuilding my heater system, new core, replace the blown blower motor etc. To increase the air flow, the options seem to be:

1. enlarge the opening in the bulkhead
2. get a blower that moves more air

What else am I missing? Any ideas about a better blower motor? LR, GM, ... whatever works best.

Cheers,
Paul
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  #2  
Old March 5th, 2009, 07:52 PM
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Pete
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Secondary heater.
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  #3  
Old March 5th, 2009, 08:40 PM
artm
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Arthur Maravelis
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I disagree.

1. replace the blower motor. I recently saw a video fromthis guy:

http://www.youtube.com/user/southrover

and he replaced it with an American version from NAPA or such. Email him and find out. I wouldn't be surprised if the stock blower is whimpy. I did take mine out once to get water out and it looked strong when running. Who knows though. All a swap involves is widening the hole, bolt on the replacement and seal it well.

2. Also, forget that stupid plenum with all its leaks and inefficiencies. From the bulkhead hole, fabricate a smaller plenum leading to four tubes - two for the floor openings and two for the defrosters. You'll also have to fabricate flaps to control flow and reroute the cables but it should be worth it. This way you get all the flow to go through the tubes.

I would bet that if you did #2 you would not need a stronger blower motor.

3. You can replace the core with a more efficient aluminum one. This is most likely a custom job not done by you, hence $$$.
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  #4  
Old March 5th, 2009, 08:52 PM
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Chris Hinkle
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There is a lot of resistance to moving air into our 90s. Not just from the bulkhead hole, but also the design of the distribution system in the dash. If you've have the lower dash apart - you have to wonder where the guy went to engineering school. Easiest soluton is stronger motor, the hole diameters etc are going to take some serious effort to change.
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  #5  
Old March 5th, 2009, 09:08 PM
artm
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Arthur Maravelis
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Don't forget that the defroster tubes are already there, attaching to those is easy.

As for the floor holes, there are vents that you can simply screw on to cover the holes (inside the plenum) and they have tubes so easy hookup.

The same goes for the bulkhead hole: there are vents but you need one with a flap control. It's not as hard as it sounds. You can even fab one out of mild steel: an input hole to match the bulkhead and two output holes. A flap inside this box sliding over these two holes (controlled by the same cable or a shorter one) and you're done. I bet there's one already out there that fits in the plenum space right behind the bulkhead hole.

One final point: I find the flow in my gas 90 to be excellent, the temperature very good to excellent. However, the flow in a 110 Tdi is good and the temperature is poor. I assume its the same heater assembly but something's strange here. And yes, I'm comparing the Tdi's performance when the motor's fully hot.
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