Heater fan upgrade in the NAS D-90???? - Page 7 - Defender Source
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  #121  
Old February 18th, 2016, 01:51 PM
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Originally Posted by Nomar View Post
just started on this wonderful journey...and I gather from John/Jason et al that the bulkhead opening needs an additional 2" to the pass side- correct?

I have a bare bulkhead right now so I want to get this out of the way while it's easy to cut and access!


.
I opened up 1.5" to 6", see here: Land Rover Defender Heater Upgrade - Page 1 which, IIRC, matched the full width of the stock heater.
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  #122  
Old February 18th, 2016, 02:15 PM
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Originally Posted by Red90 View Post
I opened up 1.5" to 6", see here: Land Rover Defender Heater Upgrade - Page 1 which, IIRC, matched the full width of the stock heater.
To be clear is there any notching that can be done on a RHD 90/110/127?
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  #123  
Old February 18th, 2016, 02:20 PM
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Originally Posted by JohnsD90 View Post
To be clear is there any notching that can be done on a RHD 90/110/127?
adjust the vents is a good start ... they get out of adjustment and don't seal
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  #124  
Old February 18th, 2016, 02:21 PM
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Originally Posted by JohnsD90 View Post
To be clear is there any notching that can be done on a RHD 90/110/127?
I don't think so. I have not looked at it in person myself, but IIRC, from photos, the heater plenum inside the truck ends at the edge of the hole through the bulkhead.
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  #125  
Old February 18th, 2016, 02:25 PM
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Originally Posted by leastonce View Post
adjust the vents is a good start ... they get out of adjustment and don't seal
IMO..... The vents in a non-AC truck are the main restriction and these can do with a fair bit of opening up. From my page info...

Bulkhead hole: 4.5 x 3.25" = 14.6 sq inches.
Dash vents: 2@ 1-3/4" x 2-1/4" = 7.8 sq inches.
Stock fan inlet = 14 sq inches.

From those simple measurements, the dash vents restrict air flow much more than the bulkhead hole.
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  #126  
Old February 18th, 2016, 02:39 PM
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Originally Posted by Red90 View Post
IMO..... The vents in a non-AC truck are the main restriction and these can do with a fair bit of opening up. From my page info...

Bulkhead hole: 4.5 x 3.25" = 14.6 sq inches.
Dash vents: 2@ 1-3/4" x 2-1/4" = 7.8 sq inches.
Stock fan inlet = 14 sq inches.

From those simple measurements, the dash vents restrict air flow much more than the bulkhead hole.
What vents are we talking about?
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  #127  
Old February 18th, 2016, 02:49 PM
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Originally Posted by Red90 View Post
I don't think so. I have not looked at it in person myself, but IIRC, from photos, the heater plenum inside the truck ends at the edge of the hole through the bulkhead.
This is correct, no mods needed for RHD.
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  #128  
Old February 18th, 2016, 02:56 PM
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What vents are we talking about?
There should only be two vents in the dash of a normal Defender unless you have AC.

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  #129  
Old February 18th, 2016, 03:06 PM
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Originally Posted by JSBriggs View Post
Pull the heater box away from the bulkhead. You will be able to see if the openings are the same.

-Jeff
The answer is no...

http://www.defendersource.com/forum/...tml#post614350
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  #130  
Old February 18th, 2016, 03:07 PM
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Quote:
Originally Posted by Red90 View Post
There should only be two vents in the dash of a normal Defender unless you have AC.
Gotcha, thanks, I was confused as NYC Jason said they were "adjustable".

Quote:
Originally Posted by JSBriggs View Post
Pull the heater box away from the bulkhead. You will be able to see if the openings are the same.

-Jeff
Will do, the unit is coming out tomorrow to get a new heater core anyway, will do the fan while I am at it.
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  #131  
Old February 18th, 2016, 05:56 PM
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Originally Posted by JohnsD90 View Post
Gotcha, thanks, I was confused as NYC Jason said they were "adjustable".
He's talking about the blend doors in the heater box.
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  #132  
Old February 20th, 2016, 08:55 PM
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I bought PM137, which i think is the same exact size as PM136, the difference I believe is that PM137 is not internally grounded and has 2 connectors on the outside which when I put power and ground to them, it made it spin, and when I flipped the power and ground, it spun the other way. You can also buy the pigtail connector from autozone so you can have a "nice" connection.
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  #133  
Old March 3rd, 2016, 11:45 AM
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Originally Posted by Red90 View Post
There should only be two vents in the dash of a normal Defender unless you have AC.
I installed the PM137 Fan, new heatercore with new insulation around the core, It is definetley an improvement, I do not know how much better it was though.

I also removed the Driver side lower plastic vent and that greatly improved the airflow. I didn't pull the passenger one as I like the restriction there to send more air to the driver side.

The Wolf Rad Haz TUM Radiation kit greatly helped retain the heat within the cabin.
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  #134  
Old April 19th, 2017, 08:56 PM
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When swapping out the fan with a PM136 or PM137 and installng the new connector as shown in this thread, post 59, what happens with the little silver box that is attached to the stock fan. It appears that it might not get used?

Any help is greatly appreciated.
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  #135  
Old April 21st, 2017, 08:01 AM
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That's the interference suppression filter, originally fitted to an FFR/ military radio truck. As long as the motor is the same voltage as your truck - fit it as normal, then mount the box using screws to a good earth and that's it. Enjoy
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