Air Conditioning "hum" And "ice" On Part- Rx400H
Posted 21 May 2012 - 06:13 PM
The temperatures are starting to get warm here in RI and for a few weeks or so i've been using the A/C. However today (~65 degrees F and rainy) i noticed a strange "humming" sound coming from the engine compartment above 5MPH only when i have the "A/C" button set to ON. Once i go below 5mph it turns off, and it also turns off when the A/C is off. But once i go above 5MPH with the A/C ON, the hum returns. I also noticed that the gas pedal was "vibrating" while the car was humming. And since the hum disappears when the car is stopped, i can't find out where it's coming from... just somewhere in the engine compartment. I have never in the past 3 years of ownership heard or FELT this humming before. And it's not the engine cooling fans as they are operating normally and it's not the new hum i'm hearing.
This happened consistently for a 30min trip, half highway and half city. When i got home, i noticed another noise which is "familiar" to the Rx400h ( which i usually hear only once and a while when the A/C is ON)- it sounds like a mini chainsaw, or "buzz" sound. It now happens whenever the A/C is ON, whether i'm moving or not. In the past i've heard this noise every once a while, but it's never stayed on for such long periods of time.
The gauge cluster engine temp gauge read normal, also.
When i inspected under the hood, i noticed my engine coolant was a bit low, so i topped it off. It only took 2 glass-fulls to top it off, so i don't think i was "that" low.
I then noticed a strange pipe with ICE on it. A LOT of ice. Once the car was turned off, in about 10 mins the ice started to melt. I've never noticed this thing covered with ice before, so i don't know if it's normal or not. The outside temp is about 65 F and i had the interior temp set to 73 with LOW fan speed... Honestly i didn't think the A/C should be stressing much!
Here are some pics of the iced part:
What do you guys think is going on? What could this humming sound be? And why the ice? Thanks for any input!
Posted 21 May 2012 - 07:35 PM
You may be running low on refrigerant. Low refrigerant levels can make the cold coil too cold. Fix the refrigerant leak and fill it up.
My guess is that it is an indication that something is not right.
Posted 25 May 2012 - 09:25 AM
Posted 28 May 2012 - 08:33 PM