Diagnosing D110 Climate Controls - Defender Source
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  #1  
Old September 24th, 2007, 01:49 PM
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John Crouse
'93 NAS D110 (#8) / '61 Series II
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Diagnosing D110 Climate Controls

I'm trying to figure out what's going on with the heat/vent controls on my '93 NAS D110. Fan switch seems to work ok, but the three slides above it don't seem to do much. I don't think the intake vent in the wing is opening. Any guidance on diagnosing what is working and what isn't?
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  #2  
Old September 24th, 2007, 03:23 PM
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Sterling M Archer
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D110 Controls

I think that the control to open and close the outside air vent is operated by a vacuum hose. Mine is open, bringing in outside air no matter what position the lever is in. Last weekend I installed a new heater core, and noticed a rubber tube that was cut in the wing vent.

The lever to switch between cold and hot sticks. You will notice that on top of your heater/ac coil box (the black box on the right side in the engine bay) there is a cable on the top. You will want to put some penetrating oil into the cable like PB Blaster to free it up.

As for the fan speed lever it is marked 1-2-3-4, but my fan will cut out at position 4. I think it is the switch???
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2009 Range Rover Supercharged Black/Black: Current

1993 NAS Defender 110 #375/500: Sold
1995 NAS Defender 90 Soft Top Beluga Black #2556: Sold
1991 Range Rover Hunter Green: Sold
1997 NAS Defender 90 Station Wagon Portofino Red #128: Sold
1993 NAS Defender 110 Beluga Black #215/500: sold
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  #3  
Old September 24th, 2007, 04:55 PM
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Sounds like a vacuum problem. Richard made a nice vacuum schematic for the 110. Check it out here:

http://www.defendersource.com/forum/...referrerid=433
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Old September 25th, 2007, 02:28 PM
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John, if you need a working model to look at, I'm down in Monument.

Jon, sounds like maybe the blower motor resistor has gone bad. Often there will be a blower motor resistor used to regulate the motor's speed. When you select a higher fan speed the blower motor resistor will provide less resistance to the blower motor allowing it to spin faster thus moving more air. I know this is a common problem on RRCs (http://www.roverparts.com/Instructio..._PRC8010_1.cfm). Not sure about Defenders though.
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  #5  
Old September 25th, 2007, 03:38 PM
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Richard Kurk
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John > Check out the diagram I made referenced in the link above by Ryan. If none of the controls are working start with the vacuum tank (‘Tank Vacuum #MUC 1679’) and the black hose running from it along the bulkhead and then into the interior. If this is leaking or can’t maintain a vacuum then your controls will not operate other then their ‘no-vacuum’ state. All of the vacuum switches controlling the various settings have a ‘no-vacuum’ position which will be the position (only position) if there is a leak. For example, the ‘no vacuum’ position for the fresh air/re-circulated air is to have the vent in the bulkhead near the ECM closed and the corresponding vent on the wing to bring in fresh air to the heater-cooler assembly open. The link I posted also discusses what was wrong with just one control-vacuum switch on my 110, you may have a similar and relatively easy fix (I hope).



Jon > My 110 would also not operate on speed number 4. I repaired this about two years ago and I believe from memory the fix was to replace the relay located at the top of the heater-cooler assembly. I also bought a blower motor resistor but this did not correct the ‘speed number 4’ problem. However (from memory again) the two parts, relay and resistor, if bad will effect which fan speeds work and how many.



I hope this helps.



Rich K.
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Old September 25th, 2007, 06:37 PM
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Sterling M Archer
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Thanks for the help guys...

Were any of you able to buy a replacement vacuum hose locally, and what size?
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1995 NAS Defender 90 AA Yellow #2986: Current
2009 Range Rover Supercharged Black/Black: Current

1993 NAS Defender 110 #375/500: Sold
1995 NAS Defender 90 Soft Top Beluga Black #2556: Sold
1991 Range Rover Hunter Green: Sold
1997 NAS Defender 90 Station Wagon Portofino Red #128: Sold
1993 NAS Defender 110 Beluga Black #215/500: sold
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  #7  
Old September 27th, 2007, 12:13 PM
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John Crouse
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Diagnosing D110 Climate Controls

Thanks everyone for the input. I'll start checking vacum lines this weekend.
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