MPV blower installed in my 626=burrrr its cold in here

[evo626]

After reading this thread 929 blower (Replaced blower motor with one from a 929)
I went looking for a 929 blower but found a 90 mpv blower. The mpv blower doesn't need any modification to fix excpet for getting the last screw in. It blows very good and although I still dont have a working 4th blower speed 3rd feels like 4th used to. Its very nice and I would recommend this swap to every one. Only cost me $25.
evo

[magik8]

evo, the only reasons the blower would not work on one speed is the resistor pack or the blower switch itself not working on "4". You mentioned in your other thread that you got a replacement resistor pack from a GT. looking at the diagrams in the shop manual, the resistor pack appears to be slightly different between the pushbutton control (GT) and manual lever control (DX/LX) cars (a green shunt wire is connected in a slightly different spot). I would get the resistor assembly from a car with the manual lever controls (LX/DX) and try that. If that doesn't work, try replacing the switch.

[evo626]

Attuacly the one from the GT I got was identical to the dx resitor pack. The green wire is in the same place and it gave me the same problem. I think your right though in the fact that I need to replce the switch. I just dont know how to pull the lever unit out.
evo

[allmazda]

Actually, I saw one from a MPV in the yard but it was sitting in the back of the MPV exposed to the elements. Which way does this one spin? There should be a arrow on the base. Did you have to swap the blades?

[evo626]

They spun the same way the 626 bm spun. I didnt even have to change that. Direct bolt in.
evo

[allmazda]

I might have to make another stop and see if I can get one from an MPV. First I will check with mazda to make sure they are not the same part.

[Power6]

evo, the only reasons the blower would not work on one speed is the resistor pack or the blower switch itself not working on "4".

This would be true for speeds 1-3, but I believe 4 should be direct power to the fan for full speed. So the fault could only be in the switch or wiring.

Drew 88GT

[magik8]

Originally posted by Power6
This would be true for speeds 1-3, but I believe 4 should be direct power to the fan for full speed. So the fault could only be in the switch or wiring.

Drew 88GT

You are right, Drew. While it is true that the fan is grounded directly (not through resistors) on speed "4", it does this through a small green shunt connector, which is a part of the resistor assembly itself. Even if this green wire was not there, it should still work, but through the last resistor. I was just confused because the schematics in the shop manual show differing setups for the pushbutton and manual controls.

Here is what confused me:

manual (nonturbo, lever-operated) blower resistor assembly:


pushbutton (turbo model) blower resistor assembly:


I believe there may be an error in Mazda's schematics for the pushbutton controls regarding the resistor pack. Notice that the green wire is shown in different locations between the two scans. For the pushbutton controls (2nd scan), notice that it shows the green shunt connector connected between the resistors corresponding to speeds "3" and "4". This makes no sense whatsoever though. It should be shown connected between speed "4" and the negative (ground terminal) for the blower motor, as is shown in the manual control schematic (first scan).

So the resistor assemblies are most likely identical. So evo, I think it probably is the switch that is at fault. They should be a dime a dozen at the yards

[evo626]

If I turn the switch to 4 there is a voltage change. It goes all the way to 12.7v. The other speeds are lower and then voltage is taken from the blower wires. Should I still try to replace the control unit or could it be something else?
evo

[rcksuprstrMX-6]

where did Mazda put the blowers in those MPV's? I mean is it under the hood or inside with all the A/C duct? I've never actually looked at an MPV when I was out there... Good find Evo

[magik8]

Originally posted by evo626
If I turn the switch to 4 there is a voltage change. It goes all the way to 12.7v. The other speeds are lower and then voltage is taken from the blower wires. Should I still try to replace the control unit or could it be something else?
evo

Where, exactly are you taking that voltage reading? At the blower motor or the resistor? And between what two wires? I will assume you are measuring the voltage between the two wires (blue and blue/black) at the blower motor connector. If so, then that's normal...when the switch is at "4", the blower motor is directly grounded (it is always supplied +12v through the blue wire) with no resistors in its ground path. If it's reading 12.7 volts at that connector when it's on "4", the motor should be working....... However I'm not sure where you're hooking your voltmeter leads up to so this may not apply.

Try this. set the switch to "4" and measure the resistance between any body ground and the blue/black wire on the blower motor or resistor harness connector. It should have continuity (less than 1 ohm) or zero volts if using a voltage measurement between these two places. If there is no continuity, it's almost certainly the blower switch.

[evo626]

Thanks that should help alot.
Also I believe the mpv blower is in the same location as the 626/mx6. I dont really know since they just handed it to me when I asked for one.
evo

[rcksuprstrMX-6]

I go to a pull your own and there are like 7 MPV's out there so I'll have to go check them out.. Thanks man

[evo626]

OK I check the voltages on the blue/black wire going to the blower.
off=13.7 1st= 8v 2nd=6v 3rd=4v 4th= 13.6v
I think this means I do need a new switch because I guess it should get lower in voltage and not higher.
evo

A little late but it looks like you're doing a voltage drop test, so this actually looks correct.