Blower Fan Problem

[Rockmelon]

Originally Posted by FSETH

Yeah, I am going to try that. Let me ask you one last thing, if the fsr connection is indeed an issue, does it seem odd to you that it only happens when the a/c has been on for a half hour or more? If this is the issue, wouldn't it sometimes act up sooner during short trips?

if the prob is with the fsr connection, there is a possible explanation for it to act weird after working for some time. well, if the elect connection is not good, some carbon soot/dirt would have built up over time, this adds resistance to the connection and after working for some time, the extra resistance generates heat. heat causes resistance to increase further. so as the process goes on, at some point, the fsr will see insufficent voltage and this messes up the function of the blower. switching off the blower should help cool things down and revert to normalcy.

however, the blower remained on but resumed after switching off the ac for a while. this sounds more like frozen evaporator. if it is frozen evaporator, wouldn't there be telltale signs after lots of condensation after engine is shut off? if air is recirculated within the cabin, the amount of humdity within the cabin should not be sufficient for that much water to accumulate at the evaporator and cause the freezing right?

[Nik]

Originally Posted by Weasel

If you open the center console and pop the storage bin out you can make sure the duct to the rear vents is still attached properly. The bin is tight at first, but does just snap out straight up. Once you are looking in there with the bin out it is pretty straight forward to figure out.

I see, I will take it to indy and tell him to do exact same thing. Since I don't have any tools or anything like that. labor work over here is Pretty cheap anyway. Thanks.
Also couple of fan fingers (or whatever It's called) are broken... So many things are broken on this car, Just can't wait to get it ALL fixed so I can drive freely.

[FSETH]

Originally Posted by Rockmelon

if the prob is with the fsr connection, there is a possible explanation for it to act weird after working for some time. well, if the elect connection is not good, some carbon soot/dirt would have built up over time, this adds resistance to the connection and after working for some time, the extra resistance generates heat. heat causes resistance to increase further. so as the process goes on, at some point, the fsr will see insufficent voltage and this messes up the function of the blower. switching off the blower should help cool things down and revert to normalcy.

I see.

however, the blower remained on but resumed after switching off the ac for a while. this sounds more like frozen evaporator. if it is frozen evaporator, wouldn't there be telltale signs after lots of condensation after engine is shut off? if air is recirculated within the cabin, the amount of humdity within the cabin should not be sufficient for that much water to accumulate at the evaporator and cause the freezing right?

Are you suggesting that if I were to utilize the recirculation button on the a/c that chances of this happening may be less likely? I know my wife does not use that feature at all and come to think of it, I wasn't using it when this happened either.

[THK]

I would take the vehicle to an A/C speciality shop. Reason being, yes the equipment today allows anybody to charge the a/c. However, understanding what the gages are telling you, a lot of today's tech's don't understand.

Sound like your evaporator is freezing up due to an undercharged system or possibly an expansion valve is sticking towards the closed side. After recharging the system a performance test can be performed to determine the cause.

[simoncpw]

Same problem here.... air con works fine and cool from Engine start.... Fans slows down after about 15 mins, turning the fan manually does speed up the fan but not the actual cold air flow... turn on the front window defog button OR turn off the A/C button for a short a while (1-2 mins), then press the AUTO button it will work fine again. But only for another 10-15 mins and the problem returns.

Fan has been replaced a couple of month during the previous maintenance, I've also just replace the FSR/FSU.

I'm also interested to know what can be done next before I take it to the shop again. Temp sensor? Where is it located?

I normally switch OFF the air recirculation, does this contribute to the problem?

[Weasel]

Simon, yours sounds like it is freezing up. I'd get a thermometer to stick in the vents when running it to see if it is getting too cold. It shouldn't really blow colder than about 36 degrees. That can be caused by having a hair too low refrigerant causing the low side pressure to be pulled too low. And I usually leave the recirc on auto, let it decide when it needs to be on inside air vs outside air. (unless I'm driving by something that stinks that is)

[simoncpw]

Thanks, Weasel.

So this shouldn't cost a bomb if I take it to the shop? I was hoping try to DIY first, but doesn't look like my work schedule permits. So I don't mind taking it to the shop if it doesn't cost a lot. Especially if it's got to do with low refrigerant since it was only filled up a few weeks ago.

[Rockmelon]

Originally Posted by FSETH

Are you suggesting that if I were to utilize the recirculation button on the a/c that chances of this happening may be less likely? I know my wife does not use that feature at all and come to think of it, I wasn't using it when this happened either.

well, no harm trying the next time you go a long drive, would it? at least this may indicate whether it could be due to evaporator freezing before you get your hands on the fsr. cheers

[simoncpw]

I just tried this morning with the recirculation... but it didn't help much for my case.

[Rockmelon]

Originally Posted by simoncpw

I just tried this morning with the recirculation... but it didn't help much for my case.

how about blasting the heater with your doors open for a few minutes beforehand? sorry, no idea how's the climate at your side. hope this helps.