HVAC VENTS HISSING

[FL1P]

2018 JLU RUBICON WITH DUAL CLIMATE CONTROL
I'M AT A LOSS. WHEN THE HVAC FAN SPEED IS TURNED TO 4 or HIGHER, I GET A HISSING SOUND COMING ONLY FROM ALL 4 DASH VENTS. 1-3 SPEEDS, NO NOISE.
I'VE CHECKED EVERY POSSIBLE CONFIGURATION I CAN THINK OF TO NARROW DOWN WHERE THE ISSUE IS COMING FROM.:
-INSIDE THE CAB ONLY, NO NOISE FROM THE ENGINE BAY
-NO VISABLE SIGNS OF AC LEAK IN THE ENIGINE BAY
-NO HISSING FROM THE FAN MOTOR ITSELF
-ALL MODES: HEATER, AC, DEFROSTER, HOT or COLD, IT MAKES THE HISSING SOUND
-CABIN FILTER WAS REPLACE 2 MONTHS AGO and NO OBSTRUCTIONS FROM THE FILTER
-CONSISTANT HISSING SOUND DOES NOT GET LOUDER or FASTER AS FAN SPEED INCREASES
-THE AC DOESN'T SEEM TO GET COLD EITHER
-TEMPERATURE SEEMS TO ADJUST FROM HOT TO COLD(OUTSIDE AIR TEMP) BUT ITS HARD TO TELL IF ITS ADJUSTING THRUOUGH THE MID RANGE TEMPS or JUST HOT ON and HOT OFF

ANY THOUGHTS ON WHAT IT COULD BE?
THANKS

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[FL1P]

I was hoping to get some kinda off response before taking it into the dealer but...

Turns out there was a hole in the condenser which leaked all the Freon out of the system. $1400 later, everything seems to be back to normal.

 

[jc1003]

Expensive!!!!

 

[EtBiart]

I was hoping to get some kinda off response before taking it into the dealer but...

Turns out there was a hole in the condenser which leaked all the Freon out of the system. $1400 later, everything seems to be back to normal.

Were you under warranty? I’m having this same issue. I have a maximum care warranty which covers air/cooling but I’m hoping for no surprises.

 

[FL1P]

Unfortunately it was not under warranty as that expired years ago. Turned out to be a leaking AC condenser up by the radiator. Tough pill to swallow but the dealer charged me $1391.50. So at least the AC system was refreshed but then I was hit head on a month later and my Jeep was totaled. Ended up getting a '21 Rubicon to replace my '18.

 

[Flip]

I'M AT A LOSS TOO.

 

[mwilk012]

Were you under warranty? I’m having this same issue. I have a maximum care warranty which covers air/cooling but I’m hoping for no surprises.

The noise is Freon flowing through the expansion valve. It makes sound because it is low on Freon.

 

[Flip]

2018 JLU RUBICON WITH DUAL CLIMATE CONTROL
I'M AT A LOSS. WHEN THE HVAC FAN SPEED IS TURNED TO 4 or HIGHER, I GET A HISSING SOUND COMING ONLY FROM ALL 4 DASH VENTS. 1-3 SPEEDS, NO NOISE.
I'VE CHECKED EVERY POSSIBLE CONFIGURATION I CAN THINK OF TO NARROW DOWN WHERE THE ISSUE IS COMING FROM.:
-INSIDE THE CAB ONLY, NO NOISE FROM THE ENGINE BAY
-NO VISABLE SIGNS OF AC LEAK IN THE ENIGINE BAY
-NO HISSING FROM THE FAN MOTOR ITSELF
-ALL MODES: HEATER, AC, DEFROSTER, HOT or COLD, IT MAKES THE HISSING SOUND
-CABIN FILTER WAS REPLACE 2 MONTHS AGO and NO OBSTRUCTIONS FROM THE FILTER
-CONSISTANT HISSING SOUND DOES NOT GET LOUDER or FASTER AS FAN SPEED INCREASES
-THE AC DOESN'T SEEM TO GET COLD EITHER
-TEMPERATURE SEEMS TO ADJUST FROM HOT TO COLD(OUTSIDE AIR TEMP) BUT ITS HARD TO TELL IF ITS ADJUSTING THRUOUGH THE MID RANGE TEMPS or JUST HOT ON and HOT OFF

ANY THOUGHTS ON WHAT IT COULD BE?
THANKS

DID YOU EVER GET IT FIGURED OUT BUDDY?

 

[Ratbert]

DID YOU EVER GET IT FIGURED OUT BUDDY?

He eventually reverted to his inside voice.

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