AudiWorld Forums

AudiWorld Forums (https://www.audiworld.com/forums/)
-   Audi A5 / S5 / RS5 Coupe & Cabrio (B8) (https://www.audiworld.com/forums/audi-a5-s5-rs5-coupe-cabrio-b8-125/)
-   -   Help - AirCon & Cooling Fans? (https://www.audiworld.com/forums/audi-a5-s5-rs5-coupe-cabrio-b8-125/help-aircon-cooling-fans-2970740/)

kkearsey 04-17-2019 07:30 AM

Help - AirCon & Cooling Fans?
 
Hi all, long time broswer, first time poster.

I've been searching forums/websites for information and solutions. I was wondering if anyone had a similar scenario as my 2.0t A5.

It started when the car went in to get the air conditioning recharged at an indy shop. As soon as I picked the car up, the air conditoning was blowing cold. I noticed the fans running, but never though much of it since I was using the AC.
I noticed that as soon as the car turns on, both fans kick into high speed and shut off approx 5 mins after car is turned off. I ran over to another members house, had the engine codes read. It was a P0480 which is Fan Control Module 1. The mileage this code first showed up was the exact mileage when I dropped the car off the the shop for the recharge. I understand that this code code be the fcm, cts, thermostat, or fan itself. My question is that has anyone ever had an issue when the AC being overcharged resulting in the AC Refrig Pressure sensor causing the fans to run constant? Could this be the fix? Also, am I able to remove the AC pressure sensor without having to recharged the system again?

Thanks in advance!

ecgarzone 05-02-2019 06:39 PM

YOUR SYSTEM MAY HAVE BEEN OVERCHARGED. THE FANS, UNDER NORMAL OPERATING CONDITIONS, ARE TO DESIGNED KICK ON WHEN THE HIGH SIDE REACHES A PREDETERMINED PRESSURE. WHEN THE CAR IS SHUT OFF, REFRIGERANT MIGRATES BACK TO THE HIGH SIDE, AND WILL TRIP THE PRESSURE SWITCH AND THE FANS WILL RUN AT STARTUP. ONCE THE FANS DRAW ENOUGH AIR ACROSS THE CONDENSER (IN FRONT OF THE RADIATOR) THE PRESSURE WILL DROP AND THE FANS WILL CUT OFF. SUGGEST YOU TAKE THE CAR BACK TO WHERE THE AC SYSTEM WAS SERVICED.

kkearsey 05-03-2019 04:06 AM

Thanks Eecgarzone. I figured there was a connection between the two. I order a new AC refrig pressure sensor. Waiting for it to arrive. Once installed, I'll clear any codes and see how it works.

On a side note, I did return the the garage where I had the AC charged. They said that the fans running is a electrical/sensor issue and them charging the AC had nothing to do with it. Meanwhile the time the code was thrown was exact mileage when the car was dropped off at the garage. I didn't argue; just that garage isn't getting my bussiness anymore :).

I will post up my results, hopefully next week.



Originally Posted by ecgarzone (Post 25311383)
YOUR SYSTEM MAY HAVE BEEN OVERCHARGED. THE FANS, UNDER NORMAL OPERATING CONDITIONS, ARE TO DESIGNED KICK ON WHEN THE HIGH SIDE REACHES A PREDETERMINED PRESSURE. WHEN THE CAR IS SHUT OFF, REFRIGERANT MIGRATES BACK TO THE HIGH SIDE, AND WILL TRIP THE PRESSURE SWITCH AND THE FANS WILL RUN AT STARTUP. ONCE THE FANS DRAW ENOUGH AIR ACROSS THE CONDENSER (IN FRONT OF THE RADIATOR) THE PRESSURE WILL DROP AND THE FANS WILL CUT OFF. SUGGEST YOU TAKE THE CAR BACK TO WHERE THE AC SYSTEM WAS SERVICED.



All times are GMT -8. The time now is 09:24 PM.


© 2019 MH Sub I, LLC dba Internet Brands