Cali Cruse Posted October 16, 2018 Share Posted October 16, 2018 Good morning, Blower morning went out on this cold morning and I'm going to replace it. Already found the DIY video, although performed on a Cherokee, but layout is the same. Here is my question though, is the Cherokee motor more powerful than the Comanche blower motor? Former has more cabin to heat, maybe it makes sense to put that one in? Or are they the same thing? 1991 Jeep Comanche 4x4, inline 6, 5 speed manual transmission Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 16, 2018 Share Posted October 16, 2018 Same motor, same part number, 56002858. Link to comment Share on other sites More sharing options...
Pete M Posted October 16, 2018 Share Posted October 16, 2018 just make sure it's not the resistor pack or the ground. hate for you to do all that work if it was something simpler. Link to comment Share on other sites More sharing options...
Cali Cruse Posted October 16, 2018 Author Share Posted October 16, 2018 Thanks. Will the manual show where the resistor pack is? Link to comment Share on other sites More sharing options...
Green Mesa XJ Posted October 16, 2018 Share Posted October 16, 2018 Same motor but watch the aftermarket brands. TYC I think it was has a cheap motor but lacks power throughout the ranges. Replaced it with a U.S.A. made motor and it is a big difference Sent from my iPhone using Tapatalk Pro Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 16, 2018 Share Posted October 16, 2018 10 minutes ago, Green Mesa XJ said: Same motor but watch the aftermarket brands. TYC I think it was has a cheap motor but lacks power throughout the ranges. Replaced it with a U.S.A. made motor and it is a big difference ^^ This applies to every replacement part. When you cheap out it usually ends up costing more in the long run. Link to comment Share on other sites More sharing options...
WahooSteeler Posted October 16, 2018 Share Posted October 16, 2018 x3 on the TYC motor and cheap(est) alternatives. The motor housing has a hole at the 6 o'clock position for a rubber hose that connects to an opening on the firewall just below the blower housing. The blower motor essentially cools itself by collecting air from the HVAC box and directing back to the blower motor via the small rubber hose. The TYC unit and other cheapies have the hole in the 4 o'clock position and the stock "cooling" hose will not reach from there. Ask me how I know. Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 16, 2018 Share Posted October 16, 2018 C.R.A.P. = not quite right. I think they do it on purpose. Have you checked the blower fuse on the fuse panel? Link to comment Share on other sites More sharing options...
Pete M Posted October 16, 2018 Share Posted October 16, 2018 On 10/16/2018 at 11:06 AM, Cali Cruse said: Thanks. Will the manual show where the resistor pack is? should. but in any case, it's above the passenger's feet held in by a couple screws needing I think an 8mm socket. Link to comment Share on other sites More sharing options...
Eagle Posted October 16, 2018 Share Posted October 16, 2018 Quick test -- if the blower runs when the control is set to the highest speed -- the problem is the resistor pack, not the blower. Link to comment Share on other sites More sharing options...
kroyusa Posted October 17, 2018 Share Posted October 17, 2018 Worth checking the Blower Motor Resistor AND the electrical connector on it. Tons of pics on line showing how they can melt. When I changed my blower motor I also changed the resistor and the harness, there are kits that include both and you splice the connector wires into harness at a point where the existing wires aren't brittle. Link to comment Share on other sites More sharing options...
cruiser54 Posted October 17, 2018 Share Posted October 17, 2018 Here's one reason they melt: On 87 to 90 MJs and XJs, the blower motor’s factory grounding point is on the driver side inner fender under the sheet metal screw. This ground is shared with windshield wipers, front windshield washers, rear windshield washers, AC clutch relay, fan control relay, fog lamps, fan motor, headlamps, front turn signals, front side markers, and park lamps. So your blower motor has its ground point 10 feet away from where it is located!! What we’re going to do is leave that ground intact and also ground the blower motor on the passenger side inner fender much closer to the blower motor itself. This will also benefit the other components on the factory ground circuit. Take this opportunity to refresh the factory ground as a matter of course. Remove the screw, scrape the surface to bare metal and reinstall the screw securely. Here’s what I do to get the ground much closer to the blower motor and add another ground point to this overloaded ground circuit. Find the blower motor connector on the passenger side. Red and Black two wire connector. Find a location where the black wire can be made to reach the passenger side inner fender, and cut the wire. You may have to do some rerouting of the harness to achieve this. Take both cut pieces of wire and put them together into a yellow eyelet and crimp. Fasten the eyelet to a place on the passenger side inner fender with a sheet metal screw after applying OxGard to the contact surfaces. Be sure to scrape the attaching point on the fender to bare metal first. Your blower motor will now turn faster and last longer, and the other electrical components on the circuit will benefit from a better ground path. Link to comment Share on other sites More sharing options...
Cali Cruse Posted October 18, 2018 Author Share Posted October 18, 2018 On 10/16/2018 at 10:59 AM, Pete M said: just make sure it's not the resistor pack or the ground. hate for you to do all that work if it was something simpler. On 10/16/2018 at 2:17 PM, Eagle said: Quick test -- if the blower runs when the control is set to the highest speed -- the problem is the resistor pack, not the blower. Thank you kindly. The blower motor doesn't work at any speed... like the Corvair. I checked. So it'll be a trip to the advance Auto parts and get a carquest American made blower motor. Link to comment Share on other sites More sharing options...
Pete M Posted October 18, 2018 Share Posted October 18, 2018 did you inspect the resistor pack? the typical failure is the resistors (giving just hi speed), but the pack is prone to corrosion and can fail completely too. I would also give power and ground to the motor to check its condition. Link to comment Share on other sites More sharing options...
87MJTIM Posted October 18, 2018 Share Posted October 18, 2018 Hey! Don't go knockin' Corvairs! My dad had two and he loved them. R Nader does not know how to drive, that's all. Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 18, 2018 Share Posted October 18, 2018 12 minutes ago, Cali Cruse said: Thank you kindly. The blower motor doesn't work at any speed... like the Corvair. I checked. So it'll be a trip to the advance Auto parts and get a carquest American made blower motor. Good luck finding anything American made at Advance except maybe the building. Link to comment Share on other sites More sharing options...
JMO413 Posted October 18, 2018 Share Posted October 18, 2018 The OEM resistor is still available. Part number 55036000 Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 18, 2018 Share Posted October 18, 2018 2 minutes ago, JMO413 said: The OEM resistor is still available. Part number 55036000 So is the blower motor, part number 56002858. Link to comment Share on other sites More sharing options...
johnj92131 Posted October 19, 2018 Share Posted October 19, 2018 6 hours ago, 87MJTIM said: Hey! Don't go knockin' Corvairs! My dad had two and he loved them. R Nader does not know how to drive, that's all. 6 hours ago, Cali Cruse said: Thank you kindly. The blower motor doesn't work at any speed... like the Corvair. I checked. So it'll be a trip to the advance Auto parts and get a carquest American made blower motor. Nader's book was "Unsafe at Any Speed". He had a Chapter on the 60-63 Corvair swing axel rear suspension and some wrong claims about how it worked. I own 2 Corvair's. A 69 convertible with 25k miles and a 67 coupe Link to comment Share on other sites More sharing options...
Cali Cruse Posted October 20, 2018 Author Share Posted October 20, 2018 Oh I'm a big fan of the Corvair, the size, the location of the engine, everything about it was exotic in nature. I mean look at Porsche 911, Boxter or mid engined sports cars from other manufacturers. Happy to see Corvette going mid-engined by 2020 MY. Link to comment Share on other sites More sharing options...
Cali Cruse Posted October 20, 2018 Author Share Posted October 20, 2018 Also, when rewiring the wire on blower motor red goes on A and black on B? Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 20, 2018 Share Posted October 20, 2018 On my 91 blower, BLK (-) is pin B, and GRN (+) is A. Link to comment Share on other sites More sharing options...
Cali Cruse Posted October 20, 2018 Author Share Posted October 20, 2018 Update put in the blower motor, used the same terminals, re crimped and plugged in. Won't spin, the resistor pack? However the motor was not working on any setting? Heater not blowing, just hear rattling noise when going from setting to setting. Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 20, 2018 Share Posted October 20, 2018 Test the motor unplugged with an external 12V supply. Like a battery charger if you have one, or 12V off your battery. Also if you have a meter, hook up across pins A and B and measure the resistance through the windings. Link to comment Share on other sites More sharing options...
Gene Posted October 20, 2018 Share Posted October 20, 2018 On 10/18/2018 at 10:54 PM, johnj92131 said: Nader's book was "Unsafe at Any Speed". He had a Chapter on the 60-63 Corvair swing axel rear suspension and some wrong claims about how it worked. I own 2 Corvair's. A 69 convertible with 25k miles and a 67 coupe This is off topic for this thread, but I think it's an interesting area. I had an old swing axle Volkswagen beetle. I started a thread in "The Pub". Gene Link to comment Share on other sites More sharing options...
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