![]() ![]() ![]() If the aluminum were thick enough (say, 1/4”) I think the heat would be distributed over its surface enough not to unduly heat the overlaying carpet.Īnd BTW regarding your polarity question, yes it matters very much which wire goes to which pin on the transistor so to be safe I recommend taking a clear picture of how it’s currently wired and then being careful to always reproduce that exactly. Someday I will mount it properly perhaps under or behind the passenger seat.)Īnother option would be to mount it, isolated, to a large thick sheet of aluminum which itself is mounted to the forward side of the above steel plate. (My current rig is too big for that so at the moment it is loose on the floor of the passenger footwell. If I wanted to hide it away I would put it forward of that plate but would also mount a small fan on or near the new heatsink to guarantee air circulation, which unfortunately also requires a +12V wire to run the fan. There is space forward of the passenger footwell closing plate (big piece of maybe. ![]() My recollection is the fan motor at full speed conducts 12-15 amps so if that touches ground it will at least produce a healthy spark. The case is connected to the wire to the fan which through the fan leads to +12V. So in putting it on some new heatsink and mounting it elsewhere you need to account for potential unwanted contact. The downside is that the isolation reduces the effectiveness of the heatsink somewhat. IIRC max power dissipation is right before it clicks into the max-speed position.Īlso, with power transistors like this there is always the choice of whether to electrically isolate the heatsink from the transistor case which reduces the chances of the heatsink touching some other circuit with harmful results. That all depends on the fan control-knob position. These Car/Bike connectors are used in many automotive. However, with an inadequate heat sink like the existing one I am pretty sure it would get to plastic-melting, leather-discoloring or passenger-startling temperature. A wiring harness is an assembly of electrical wires which is used for signal and power transmission. it would self-destruct and either fuse into a short circuit which would simply turn the fan all the way on, or open completely which is the usual failure mode). For the unit to be a fire hazard would exceed the transistor’s heat tolerance (i.e. Can the blower motor be opened up? If so, shouldn't be too hard to clean some of the oxidation off the commutator.Click to expand.There are a couple issues here. Kinks, lack of strain relief, and marten bites in the wiring harness are all possible causes of. 4 injector (high pressure) Open/short circuit or harness damage in No. Cylinder ignition coil (transistor ignition system). If it turns out that the thermal fuse is blown as well, would y'all happen to have a part # for the replacement? The engine-ECU connector terminal DI-4 makes the power transistor in the unit be. Obvious step would be to replace transistor (2SD1460/MJ 11016). If the issue ends up being the transistor assembly, I'd like to at least make a go at fixing it. Also, hitting the Off button on the CCU will shut the display down, but the fan motor will continue to blow. But then it goes back to blowing at max speed. The other 2% of the time, the motor speed slows for 5-30 seconds to what I'm assuming is the correct speed, given that the cabin has cooled down to ~around the correct temperature (I'm guessing). fan blows on balls-out high speed 98% of the time, regardless of where the fan speed knob is turned to. Is it possible for the transistor to work intermittently? Symptoms of my AC are: ![]() But if the fan only blows high, regardless of what position the fan speed knob is turned to, then the issue is likely a blown transistor that's not modulating the speed of the fan. So just to clarify, if your fan only works when the fan speed knob is turned to HIGH, the issue is with the CCU, and related generally to bad caps and busted traces. Awesome posts! Think I'll be able to get to the bottom of my AC gremlins. ![]()
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