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  #1  
Old October 12th, 2016, 06:53 PM
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Heater no worky

Hi guys. The dash fan does not work in my 1991 D110. I would appreciate any tips on where to start to investigate the issue. Sorry for the broad, non-specific question.
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  #2  
Old October 12th, 2016, 07:26 PM
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Quote:
Originally Posted by kurtisblo View Post
Hi guys. The dash fan does not work in my 1991 D110. I would appreciate any tips on where to start to investigate the issue. Sorry for the broad, non-specific question.
What dash do you have?
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  #3  
Old October 12th, 2016, 08:05 PM
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Quote:
Originally Posted by rd10014 View Post
What dash do you have?
Here is a photo of it
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  #4  
Old October 12th, 2016, 09:20 PM
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First check the fuse. Second remove the grill cover on the wing and reach in and see if the fan is free. A little mud stopped them and if so take a hose and wash out.

If that is not it, you need to check the wiring. The switch is on the ground side of the motor. Best to get a copy of the wiring schematic.
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  #5  
Old October 12th, 2016, 09:22 PM
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Neil Steinhagen
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Start with the plug to the heater. Find your heater box, pull the connector on the wires coming from the heater blower motor. Put a meter on it and see if you're getting 12V.
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  #6  
Old October 13th, 2016, 11:24 AM
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Quote:
Originally Posted by steinhnj View Post
Start with the plug to the heater. Find your heater box, pull the connector on the wires coming from the heater blower motor. Put a meter on it and see if you're getting 12V.
thank you very much for the advice. I will work on this later today and tomorrow. I also bought a volt meter.

Does the fan typically work when the engine is off but ignition is powered on? Or do I need to have the engine on to test it?
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  #7  
Old October 13th, 2016, 11:26 AM
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Ignition on.
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  #8  
Old October 14th, 2016, 12:03 PM
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I'm having similar issues.. I have same set up but RHD.
Fan moves freely, power to fuse panel and fuse (the fan icon one) is not blown, BUT it does not seem like I'm getting power to the plug on the fire wall. What is in between the plugs on the firewall and the fuse panel?

I also tested this when the truck was working and the blower switch was on to the highest position
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  #9  
Old October 14th, 2016, 12:55 PM
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I'm going to take apart the instrument binnacle and check the fan switch connections. Need to get a new multimeter (fried my cheap one) and get better reading beyond just a test light.
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  #10  
Old October 14th, 2016, 01:36 PM
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test light shows no power at the lever switch on the dash.

Could i hook 12v straight to blower motor to see if that is the main culprit?
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  #11  
Old October 14th, 2016, 01:40 PM
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Quote:
Originally Posted by Elbee View Post
test light shows no power at the lever switch on the dash.

Could i hook 12v straight to blower motor to see if that is the main culprit?
The switch switches on the ground side of the circuit. Please look at a wiring schematic to troubleshoot.
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  #12  
Old October 14th, 2016, 04:17 PM
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I think i need a new heater

So i decided to do things properly and pulled the entire heater box. The outside of the box and bulkhead looks fine but the inside of the heater box barfed tons of dirt and rust. The heater matrix looks knackered (looks like there is a plug already in it) and the fan is probably shot.

So what is a good upgrade unit for a heater? I know summit has one or two. I need something that replaces the entire box. I know the fan and heater matrix aren't too expensive, but if i already have it pulled...

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  #13  
Old October 14th, 2016, 04:35 PM
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I'm think of trying the Summit Racing that John (red90) did. Mine is RHD and I wont be able to do the intake from the side of the wing, but i'll keep the intake stock and pull air from the top the wing with the OEM intake and some adapter that i'll probable have to make.
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  #14  
Old October 14th, 2016, 05:39 PM
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Buy a new fan motor and heater core. They are not expensive relatively speaking. Clean up and paint the box (which is the hard to get expensive part).
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  #15  
Old October 14th, 2016, 06:26 PM
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that might be easier... I'll have to see who carries the parts stateside
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  #16  
Old October 14th, 2016, 07:09 PM
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Two Questions:
Is the heater matrix with downturned pipes compared to horizontal pipes compatible?
AAP817 VS UTP1725
How does it make that much difference?

ALSO.... The blower motors, how does it matter is they are RHD or LHD? They are fans pushing air, i don't see how they could be different. RTC4200 VS RTC4201

The price alone for a blower fan is almost as much as a full SUMMIT racing Heater system.
I tempted to go the summit racing route.
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  #17  
Old October 14th, 2016, 07:19 PM
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No the matrixes are different dimensions to fit different boxes. One is not better than the other.

The fans spin opposite directions. They need to spin towards the top to be efficient.
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  #18  
Old October 14th, 2016, 08:48 PM
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Do some research on here before you buy the heater motor. There's a thread here about replacing the blower motor with a blower motor you can pick up at Autozone. It required some modification to the internal ground but a later post mentioned another motor that had the internal ground already in it.

I refurbished my heater with a new britpart core and upgraded motor and it sweats me out on the highway when it 38F.
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  #19  
Old October 14th, 2016, 09:29 PM
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Thanks guys!
I'm trying to find more info on this upgraded fan from autozone. Is this the part numbers? Napa G.M. blower motor # M-4722 or GM 14-8154-4 OR is it PM136

EDIT: I found the thread http://www.defendersource.com/forum/...nfo-65225.html
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  #20  
Old October 15th, 2016, 12:55 PM
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Hi all. So please excuse me for my absolute lack of knowledge. I am learning and i appreciate all your help. I did pull off the fuse cover and the fan cover. The Fan does move (photo attached). I don't know how to tell if the fuses are blown or not (photo attached). I pulled out a few of the fuses and used a simple volt meter that i have but i couldn't get it to light up on any of the fuses when the ignition was on so i don't think it have the right kind of meter. I bought a different one Amazon and will give it a try on the fan fuses.

I also tried to find the plug for the fan (see attached photo). Not sure if that is the right fan box.

I appreciate any help to the mechanically challenged. The reality is that if it is not a relatively easy fix, i will likely have to take it to a shop to investigate and repair.
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