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| | Good day by SDMickey - March 27th 2024 10:55 pm
| Lew Greger by MufflerMan Mike - March 27th 2024 5:15 pm
| | | heater blower not blowing strong to defrost windshield | Joined: Aug 2010 Posts: 336 enthusiast | OP enthusiast Joined: Aug 2010 Posts: 336 | i finally brought my 79 b200 out of the garage. went to defrost the window but the fan is blowing extremely low. have checked for leaves in system but nada. the fan runs thru the different settings but just does not flow strong. then....i found the blower motor resistor block had a broken wire on the micro-temp switch . i want to fix this but also maybe need to swap whole system out....??? has anyone done that. the air is shot too. i have never heard of this blower motor resistor block...........i miss my 68 jeepster. lol would appreciate any word of wisdom............thanks | | | Re: heater blower not blowing strong to defrost windshield | Joined: Jan 2014 Posts: 2,290 Likes: 137 veteran | veteran Joined: Jan 2014 Posts: 2,290 Likes: 137 | I'd start by replacing the resistor and see how it behaves after that. If that doesn't do it, I'd try the blower motor. I'm a Chevy guy though, so take all that with a grain of salt. I'm sure one of the Dodge guys will chime in soon. | | | Re: heater blower not blowing strong to defrost windshield | Joined: Aug 2010 Posts: 336 enthusiast | OP enthusiast Joined: Aug 2010 Posts: 336 | got the resistor block from ebay and arrived today. will install and see. the one from ebay looks just like the factory manual but does not match what i took out. oh boy, here we go again. the one i took out had 3 prongs on one side and had a 2 prong on the other. but the one i got has 3 on one side and 1 on the other. lol you just have to laugh after a while. | | | Re: heater blower not blowing strong to defrost windshield | Joined: Jan 2014 Posts: 2,290 Likes: 137 veteran | veteran Joined: Jan 2014 Posts: 2,290 Likes: 137 | From what I hear Dodges have a bunch of weird electrical issues, I sure hope that does the trick for you. | | | Re: heater blower not blowing strong to defrost windshield | Joined: Apr 2010 Posts: 2,847 Likes: 42 veteran | veteran Joined: Apr 2010 Posts: 2,847 Likes: 42 | If the blower.motor does.change speeds with the switch..its limely not.the resistor pack
Try feeding the motor 12 v directly from.battery and check flow..then reverse the wires.and recheck flow.
The brushed blower motor. If wired backwards will.spin backwards. It will still blow. But not very much.
I use a 40 amp 21 khz pwm motor speed controller. Fed with 8 awg wire.
Infinitly variable speed and works with no key in the ignition.
On slow.speeds below.minimum of the stock.speed switch... it will pump engine heat in to cabin 45 minutes or more after engine shut down. | | | Re: heater blower not blowing strong to defrost windshield | Joined: Aug 2010 Posts: 336 enthusiast | OP enthusiast Joined: Aug 2010 Posts: 336 | thanks. i really appreciated all the input. getting back into doing the van. i ran out of patience and money after 2 painters screwed me and cant find anyone to do what i dont know. so i am just taking my time and try not to get pissed off. its hard not to. did not have this much trouble working on fighter jets!! | | | Re: heater blower not blowing strong to defrost windshield | Joined: Apr 2010 Posts: 2,847 Likes: 42 veteran | veteran Joined: Apr 2010 Posts: 2,847 Likes: 42 | When i got.a.new blower Motor.amd.wired.it.up. i had the 4 speeds.but it.was not moving.much air.
Swap the wires.to.the.motor and thar she blows.
The wire colors were opposite of logical.
I upgraded some.wiring from. Rebuilt speed.switch to motor at tht time and the increased voltge reaching motor spun it noticebly faster.
Last year i added the pwm motor speed controller. I can swap one connector and return the original resistor.pack to.fan control. But the pwm msc is.more efficient. The resistor packs turn alternator. Juice into a lot of heat at reduced speeds.
If i could go back in time to when i originally rebuikt speed.switch and wiring.to resistor.pack and motor. I'd just go pwm msc instead.
My new VdO blower.motor's brushes twice became stuck.requiring disassembly second time i made.brushes a bit smaller. . The third.time a tap.with a hammer returned function.
Aon my 89 the blower motor.was rounded nearby on firewall. Dodges are notorious for a.poor.ground.somewhere causing all sorts of mischief. | | | Re: heater blower not blowing strong to defrost windshield | Joined: Aug 2010 Posts: 336 enthusiast | OP enthusiast Joined: Aug 2010 Posts: 336 | since the wire( a hard wire) on the micro temp switch is broken i am trying to find a heater blower motor resistor. cannot find one. i am tempted to connect the one i got from ebay---since it does say for my year on the factory box i thought maybe it is the one for a non-air conditioned van cause there is one connector missing on it. it is exactly the picture of what is in my factory manual-- ( however the manual does not show the connectors) i do have air but it will never work since the system is trash. i did check the motor and it was replaced by the previous owner and maybe the wires are reversed. since i never drove it in the cold while living in south carolina i never noticed the slow speed. lol but now i am in WV and it is cold.............it is quite possible that the leads were reversed so i will take your advice and see if a swap makes a difference...........but i still want to replace the resistor since i do know it is broken . still searching for a replacement. would anyone know of a source to get the heater blower motor resistor? thanks........think i need a group of vanners close by to help me ponder lol | | | Re: heater blower not blowing strong to defrost windshield | Joined: Jan 2001 Posts: 2,964 Likes: 63 veteran | veteran Joined: Jan 2001 Posts: 2,964 Likes: 63 | The factory part number for a blower motor resistor with AC is 3489210, without AC is 3514326. Partsvoice shows 1 resistor available for a van with AC. | | |
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