[Eric L.]

I find the defogger on my MO works great, provided you turn up the heat a bit (over 65) and make sure the AC is on.

 

[Eric L.]

With the AC on have fresh air or recirc air doesn't really matter. The big thing is that the AC was on.

I would make sure your AC is working... sounds like it is not.

I agree. My window starts to clear immediately with the defog on. It does sound like the AC isn't working right above.

 

[Eric L.]

Checked operation - turn on front defrost - A/C compressor and electric fan come on for 5 seconds - then shuts off for 15 seconds- and continues to repeat this cycle. Is that NORMAL ??

That doesn't sound normal - it should be on continuously when the defog is on.

 

[Eric L.]

Would you mind if you get a chance to check yours and see if it does this same 5 sec on -15 sec off routine ?? Then we would know for sure if this is the problem.

thanks

Ok I'll listen tomorrow. Its been raining lately so I've had defog on continuously.

 

[Eric L.]

I'll have to listen to mine more carefully, but honestly I've never heard the compressor cycling, only the second electric fan. If they both happen at the same time, then maybe the fan switch is louder than the AC clutch.

 

[Eric L.]

Had a look and a listen this morning - yeah you are right, the compressor clicks on the same time the secondary electric fan does. However, I did not have a 5 second / 15 second cycle, it was more random. Over two minutes, the compressor sometimes turned on for as long as 20 seconds, sometimes as short as 3 seconds, there didn't seem to be a pattern - but as joe says, its whatever it takes to keep the system pressurized.

 

[Eric L.]

OK guys- we have been around the block once now and I am still searching for an answer. Here is what I know:

1) compressor and outside air functional when DEFROST on
2) might be plugged cabin filter - but at 10k miles- I rather doubt it
3) "If it is cooler (this time of year at least 20°F) then you have just **GOT** to stop making out in the car while driving. ............"
ELIMINATE THIS AS THE PROBLEM- THAT SHIPPED SAILED A LONG TIME AGO -BESIDES I AM NOT SURE WARRANTY WOULD COVER THAT

So where do we go from here --- except to the dealer......and you know what they are going to say.............

Does the windshield clear faster if you manually turn the fan to max?

 

[Eric L.]

Turn the TEMP UP....... Turn the FAN to hurricane speed .......the results are the same: a half defrosted window.:1:

Its really hard to say whether the MO's defogger is just weak, or you've got some serious moisture on the windows. How about opening the windows? When my windows are really fogged up, I'll open the windows to speed up the defogger, but then I've done this on all the cars I've driven, not just the MO.