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[jon]

I started the omega two days ago to hear the sound of escaping gas from inside the air vents. If i turned the AC to eco mode the hissing stopped and in auto mode setting the temperature to Lo now does not produce any increased cooling effect. I suspect the evaporator has a hole in it and the AC gas is escaping. Has anybody exchanged the evaporator? is it an easy job or is it burried deep in the dash needing a full dash out job which would not be worth the effort for me. My car is a year 2000 elite 3.0 final shape.

[RobG]

AC needs discharging (specialist job) glovebox out, remove blower motor,disconnect refrigerant pipes at the bulkhead,remove expansion valve from evaporator then remove evaporator from distribution unit . Not really a DIY job.

[Andy B]

AC needs discharging (specialist job) glovebox out, remove blower motor,disconnect refrigerant pipes at the bulkhead,remove expansion valve from evaporator then remove evaporator from distribution unit . Not really a DIY job.

If there's a hole in the evaporator, it doesn't need profesionally discharging .... it'll already be discharged!      

[RobG]

AC needs discharging (specialist job) glovebox out, remove blower motor,disconnect refrigerant pipes at the bulkhead,remove expansion valve from evaporator then remove evaporator from distribution unit . Not really a DIY job.

If there's a hole in the evaporator, it doesn't need profesionally discharging .... it'll already be discharged!      

Dohhhhhhhh

[jonathanh]

it may not be an ac problem.  the heater control unit is vacuum powered - if you've got a vac leak that's the sound you'll get.   one way of checking is to disconnect the vac supply, there are two vac hoses through the bulkhead - one to the HBV the other is vac suppy - disconnect it- if your hissing stops then you've got a vac leak in the heater control system.