Spearos Posted January 20, 2013 Share Posted January 20, 2013 Would really appreciate any help or suggestions with this as I really don't have the first idea when it comes to electrical problems. My 90 originally had air-con and therefore has unfamiliar heater controls when compared to other 90s, the fan has 3 speeds and the third (fastest) has never worked. With the wet/cold weather recently the windows seem to be constantly covered in condensation. The V8 produces plenty of heat so it would be really, really good to have a bit more 'blow' to get that heat into the vehicle and onto the windows! I've done a little research and have come to the conclusion that it could be down to a failed resistor? Now, does anyone know A)where the hell this lives? And B) can it be changed and if so how? or C)anything else I can do? - I plan to check and seal any leaks from the blower motor through to the vents but obviously if I had top speed working on the motor, that would improve things hugely. Any help/advice would be great as the condensation is driving me crazy!! Quote Link to comment Share on other sites More sharing options...
western Posted January 20, 2013 Share Posted January 20, 2013 assuming you have the underdash air con fitted, the resistor is item 5 in http://www.numcat.ru/landrover/p/31/52937/ might be a air con duct remove to access the motor/resistor. if it's the vertical in dash unit, resistor maybe in the control panel in http://www.numcat.ru/landrover/p/31/52944/ or within the evaporater unit http://www.numcat.ru/landrover/p/31/52939/ Quote Link to comment Share on other sites More sharing options...
Spearos Posted January 20, 2013 Author Share Posted January 20, 2013 Many thanks for your input, gives me something else to work with in my research! Looking at your links, it would appear I have the vertical dash unit. I take it there was two air con systems fitted to early 90s/110s - what do these names mean - 'underdash' and 'vertical'? Quote Link to comment Share on other sites More sharing options...
western Posted January 20, 2013 Share Posted January 20, 2013 vertical means the face of the dash you look at should look like this [but Right hand drive] the later variant is attached to the bottom face of the lower dash above your knees Quote Link to comment Share on other sites More sharing options...
Spearos Posted January 22, 2013 Author Share Posted January 22, 2013 Yes I definitely have the 'vertical' variety! I guess the resistor is in that box of tricks (item 4 in diagram) and I wouldn't want or know how to take that apart. Would a new one still be available I wonder? Even if it were it looks like it'd be over £200. So, fixing it or replacing it do not appear to be options. So does anyone know if I could fit the Rover 100 fan speed control and ballast resister - I understand it is a popular mod with 90s/110s with the convential heating/ventilation? Quote Link to comment Share on other sites More sharing options...
western Posted January 22, 2013 Share Posted January 22, 2013 looking at the air con wiring diagrams/section in my workshop manual it shows the resistor block with 4 wires red orange blue yellow/black trace the yellow/black goes to the relay, the other 3 to the control switch unit. for left hand drive vehicles it says to remove the resistor block, open bonnet, detach the blower motor wiring connector, remove the self tapping screw & lift out the resistor block, for right hand drive, open bonnet, on the left [vehicles left] of the engine bay, the resistor block has 2 hex head bolts securing it to the left wing upper inner edge approx in line with the wing top air intake cover, remove the bolts/disconnect the plug & lift out the resistor block. item 1 in http://www.numcat.ru/landrover/p/31/52815/ is the resistor for RHD vehicles. no picture of the actual resistor but here for just over 11 quid http://www.brit-car.co.uk/product.php?xProd=140732 or here for a bit less cash http://www.lrseries.com/shop/product/listing/2348/AEU1747-RESISTOR.html?search=AEU1747&page=1 Quote Link to comment Share on other sites More sharing options...
Spearos Posted January 23, 2013 Author Share Posted January 23, 2013 Western you are a legend! Really appraeciate you taking the time to look this up - top bloke! Many, many thanks! Looks pretty straight forward, and inexpensive too! What is the likelyhood the reason speed 3 isn't working being a failed resistor? Do you know if there are any tests I can do to confirm it's the resistor that's failed? Quote Link to comment Share on other sites More sharing options...
western Posted January 23, 2013 Share Posted January 23, 2013 in the air con fault diagnosis chart in my workshop manual, it says blower motor with less than 3 speeds, inspect resistor block, -- resistor block defective = replace or resistor block OK -- inspect blower switch & replace switch if defective, so yes a duff resistor will knock out 1 or more fan speeds. manual doesn't give any test for dead resistor, just the info above, glad it's all been useful. hth Quote Link to comment Share on other sites More sharing options...
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