Re: Help, A/C blower motor won't turn off
Approximately 9/25/03 08:01, np6 uttered for posterity:
> You guys are a wealth of information, thanks a lot. Oh, my Jeep does > have ATC, I forgot to state that. Unfortunately, I tried the various > suggestions and I still have the problem. > > Lon Stowell <Lawn.Stowell@Komkast.net> wrote in message news:<JBpcb.570779$o%2.256178@sccrnsc02>... > >> >> The blower motor is controlled by the ATC controls with >> speed feedback. You may want to disconnect the battery >> as it resets the control completely. This *could* be >> as trivial as the high speed relay. > > I disconnected the battery and reconnected it, but the problem is > still there. I also tried to find the relay and hit it lightly. Not > sure I actually found it, but nothing I hit made any difference. > >> With the fuse in, turn it on, then turn the motor off. >> Then pull the A/C fault codes. > > I followed your detailed instructions (thanks) and this is what I got: > Code 08 and 48. 08 means the feedback from the motor is too high which is wierd unless there is a typo in my FSM, as it claims 48 means that at some time in the past it was too low. Purely a WAG, but if that relay was shorted or the power control module was fried, I would expect solid fan speed and probably an error because the commanded speed wouldn't match the actual speed. Real jeep mechanics feel free to jump in any time here... I'd pull the relay if you can... > > I then did the output tests you mentioned and this is what I got: > > Test number 01 display 11 > Test number 02, display 28 > Test number 03, display 28 > Test number 04, display 00 [it thinks the drive to the high speed blower relay is off...] > > I then pushed the RECIRC button and the fan did speed up/down. Hmmm. So whatever is wrong is such that the fan can be controlled. To me this would eliminate the relay, but I'd still pull it just because I am such a sceptical cuss. And it looks like the power controller may indeed be able to change the amount of battery voltage available to the motor.... unless it is interacting with the high speed relay which is easily checked by yanking the relay. If the fan speed is still changeable, either the power control module has a blown position in it [dunno likelihood] or the output of the ATC module is tweaked, or the motor itself has a bad feedback pickup, causing the ATC to freak out. To narrow it down, the only way I can see is to get under there and check the voltages at a coupla points from the ATC to the motor and back... after pulling the relay of course. > I just hate paying $700 to turn off a #%@^$ fan. Just last month I > took it in to repair the CV joints, and they replaced both axles for > $800, which I was told was actually not too bad, but now for about the > same price I get to turn a fan off. Go figure. I actually bought the extended warranty [from a competitor yet] on a used ZJ on the recommendation of the service manager at the Jeep dealer [the ZJ itself was bought elsewhere] when he told me how much it typically costs to make repairs on the air conditioner, seat controls, etc. compared to the more reasonable prices for running gear repairs. Worse than a darned cadillac. |
Re: Help, A/C blower motor won't turn off
"Lon Stowell" <Lawn.Stowell@Komkast.net> wrote in message news:HtGcb.429932$Oz4.228043@rwcrnsc54... ..... > Worse than > a darned cadillac. Having messed with a '93 Taurus with ATC, I'll never own one again. Simple switch and resistor pack for me. On topic, I'll bet it's the motor speed feedback, since it did slow down during test and popped that code. I wonder if that's replaceable, without changing the blower. __ Steve .. |
Re: Help, A/C blower motor won't turn off
"Lon Stowell" <Lawn.Stowell@Komkast.net> wrote in message news:HtGcb.429932$Oz4.228043@rwcrnsc54... ..... > Worse than > a darned cadillac. Having messed with a '93 Taurus with ATC, I'll never own one again. Simple switch and resistor pack for me. On topic, I'll bet it's the motor speed feedback, since it did slow down during test and popped that code. I wonder if that's replaceable, without changing the blower. __ Steve .. |
Re: Help, A/C blower motor won't turn off
Lon Stowell <Lawn.Stowell@Komkast.net> wrote in message news:<HtGcb.429932$Oz4.228043@rwcrnsc54>...
> To narrow it down, the only way I can see is to get under > there and check the voltages at a coupla points from the > ATC to the motor and back... after pulling the relay of course. After considering all the alternatives suggested on this board, I went to a different mechanic (factory guy) and was able to talk with him more intelligently about the problem. He diagnosed it as a bad blower motor resistor, part #4720046. He replaced it for $127.05 parts and $77 labor. And I thought only Uncle Sam would pay $127 for a resistor. Imagine if it would have been a capacitor. Better than the $700 the other guy wanted to charge to replace the entire HVAC control head. Thanks again for all your advice. |
Re: Help, A/C blower motor won't turn off
Lon Stowell <Lawn.Stowell@Komkast.net> wrote in message news:<HtGcb.429932$Oz4.228043@rwcrnsc54>...
> To narrow it down, the only way I can see is to get under > there and check the voltages at a coupla points from the > ATC to the motor and back... after pulling the relay of course. After considering all the alternatives suggested on this board, I went to a different mechanic (factory guy) and was able to talk with him more intelligently about the problem. He diagnosed it as a bad blower motor resistor, part #4720046. He replaced it for $127.05 parts and $77 labor. And I thought only Uncle Sam would pay $127 for a resistor. Imagine if it would have been a capacitor. Better than the $700 the other guy wanted to charge to replace the entire HVAC control head. Thanks again for all your advice. |
Re: Help, A/C blower motor won't turn off
Approximately 9/26/03 13:31, np6 uttered for posterity:
> Lon Stowell <Lawn.Stowell@Komkast.net> wrote in message news:<HtGcb.429932$Oz4.228043@rwcrnsc54>... > >> To narrow it down, the only way I can see is to get under >> there and check the voltages at a coupla points from the >> ATC to the motor and back... after pulling the relay of course. > > After considering all the alternatives suggested on this board, I went > to a different mechanic (factory guy) and was able to talk with him > more intelligently about the problem. He diagnosed it as a bad blower > motor resistor, part #4720046. He replaced it for $127.05 parts and > $77 labor. And I thought only Uncle Sam would pay $127 for a > resistor. Imagine if it would have been a capacitor. Better than the > $700 the other guy wanted to charge to replace the entire HVAC control > head. Parts is expensive, but on the ATC system, I'd be very surprised if that motor resistor pack wasn't in the speed feedback chain pretty much as the diags showed. |
Re: Help, A/C blower motor won't turn off
Approximately 9/26/03 13:31, np6 uttered for posterity:
> Lon Stowell <Lawn.Stowell@Komkast.net> wrote in message news:<HtGcb.429932$Oz4.228043@rwcrnsc54>... > >> To narrow it down, the only way I can see is to get under >> there and check the voltages at a coupla points from the >> ATC to the motor and back... after pulling the relay of course. > > After considering all the alternatives suggested on this board, I went > to a different mechanic (factory guy) and was able to talk with him > more intelligently about the problem. He diagnosed it as a bad blower > motor resistor, part #4720046. He replaced it for $127.05 parts and > $77 labor. And I thought only Uncle Sam would pay $127 for a > resistor. Imagine if it would have been a capacitor. Better than the > $700 the other guy wanted to charge to replace the entire HVAC control > head. Parts is expensive, but on the ATC system, I'd be very surprised if that motor resistor pack wasn't in the speed feedback chain pretty much as the diags showed. |
Re: Help, A/C blower motor won't turn off
"Lon Stowell" <Lawn.Stowell@Komkast.net> wrote in message news:QR1db.155318$mp.84103@rwcrnsc51.ops.asp.att.n et... > Approximately 9/26/03 13:31, np6 uttered for posterity: > > Lon Stowell <Lawn.Stowell@Komkast.net> wrote in message news:<HtGcb.429932$Oz4.228043@rwcrnsc54>... > > > >> To narrow it down, the only way I can see is to get under > >> there and check the voltages at a coupla points from the > >> ATC to the motor and back... after pulling the relay of course. > > > > After considering all the alternatives suggested on this board, I went > > to a different mechanic (factory guy) and was able to talk with him > > more intelligently about the problem. He diagnosed it as a bad blower > > motor resistor, part #4720046. He replaced it for $127.05 parts and > > $77 labor. And I thought only Uncle Sam would pay $127 for a > > resistor. Imagine if it would have been a capacitor. Better than the > > $700 the other guy wanted to charge to replace the entire HVAC control > > head. > > Parts is expensive, but on the ATC system, I'd be very surprised > if that motor resistor pack wasn't in the speed feedback chain > pretty much as the diags showed. With continuously variable speed blower, it's not a simple resistor pack... more like a speed controller, like the robots on Robot Wars use. $127 sounds a *lot* more like a speed controller module than nichrome wire coils and a thermal fuse. That's what my '93 Taurus LX (POS) used... now an obsolete part. __ Steve .. |
Re: Help, A/C blower motor won't turn off
"Lon Stowell" <Lawn.Stowell@Komkast.net> wrote in message news:QR1db.155318$mp.84103@rwcrnsc51.ops.asp.att.n et... > Approximately 9/26/03 13:31, np6 uttered for posterity: > > Lon Stowell <Lawn.Stowell@Komkast.net> wrote in message news:<HtGcb.429932$Oz4.228043@rwcrnsc54>... > > > >> To narrow it down, the only way I can see is to get under > >> there and check the voltages at a coupla points from the > >> ATC to the motor and back... after pulling the relay of course. > > > > After considering all the alternatives suggested on this board, I went > > to a different mechanic (factory guy) and was able to talk with him > > more intelligently about the problem. He diagnosed it as a bad blower > > motor resistor, part #4720046. He replaced it for $127.05 parts and > > $77 labor. And I thought only Uncle Sam would pay $127 for a > > resistor. Imagine if it would have been a capacitor. Better than the > > $700 the other guy wanted to charge to replace the entire HVAC control > > head. > > Parts is expensive, but on the ATC system, I'd be very surprised > if that motor resistor pack wasn't in the speed feedback chain > pretty much as the diags showed. With continuously variable speed blower, it's not a simple resistor pack... more like a speed controller, like the robots on Robot Wars use. $127 sounds a *lot* more like a speed controller module than nichrome wire coils and a thermal fuse. That's what my '93 Taurus LX (POS) used... now an obsolete part. __ Steve .. |
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