So first hot day of the year today, and the A/C didn't flicker, it just refused to turn on at all in 2 or 3. I couple sweeps and it came on but not steady. 1 and 4 just fine still. So it's more to do with the sweeper itself than the connector since mine are all gold now. It is such a terrible design.I didn't pull it out and stick the multimeter on it yet today, since it's 130 in the garage during the day, but I drove around a lot and it was steady on 2 and 3. It turns off in between numbers on the way up but not on the way down. Yeah, my worry is that my new connectors aren't any better and I just pushed the problem downstream, but we'll see.
I agree - i did not do my research. I guess the solution is to clean and perhaps lightly sand the contacts and then re-cover with dielectric grease. Should last a couple of years...It is not oil, it is dielectric grease. It wasn't what was causing the bad connection. The problem comes from corrosion on the switch and if you didn't recover the switch terminals with grease they will corrode again very quickly.
The only permanent solution is adding a relay per these instructions.
I doubt the existing fan motor would be at all happy with a PWM input. (The only PWM motors I know of are dinky, for computer cooling.) The motor is a big inductive load and putting a high frequency high current square wave into it seems like a poor idea. Rapidly shut off the current into a coil and a huge voltage spike results. I don't disagree with your basic point - it should be possible to control a blower efficiently, but it isn't likely to be as simple as throwing out the resistor pack and using a PWM driver. Can't really fault Mazda for the resistor pack, as that method seems to be pretty much the industry standard. Do you know of any (production) car that has eliminated the resistor pack?The resistor pack is such a dumb waste of power. We've had pulse width modulators for several decades, but Mazda decided that turning electricity into heat was better for their bottom line.
Hi I have a 1999 Mazda Premacy and have found these threads really useful. I have the dead A/C and fan speed 4 issue too. I will be getting a new reisistor pack and hopefully that will at least get all my fan speeds back. I can't seem to find part numbers easily for the resistor but it is the slim version with 4 in line wires which are blue and yellow.Hello, unless I missed something, I dont believe I read this issue.
I have been having all the same flickering issues for some time now. My A/C only works on the Number 1 setting. After reading this thread, I pulled apart my console to pinch the connectors for a temporay fix. Upon disconnecting the switch form the connector, I revealed this. See attached Pic. Does any1 think it could be a problem with the Blower Motor Resistor. I read a little about this in other forums.
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The resistors in the fix are on a sense line to the controller, not inline with the fan. They have high enough resistance that the power dissipated there is minimal. A short circuit on the wire from the resistor pack to the resistor might heat up that wire, since it would take the resistor out of the circuit. That could potentially happen if the sense wire insulation rubbed through on a sharp metal edge. So be careful when routing those wires. (Or any wires, shorts are never a good thing.)Anyway wouldn't the resistors behind the radio thing allow them to get hot and fail prematurely? Just a thought.