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'04 Gallardo A/C Trouble


Mr. Zadir
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Hi!

 

A couple of weeks ago, my '04 Gallardo started blowing ambient air (went from blowing cold air the week before to ambient the following week). I can't find any leaks underneath the car. I jacked up the car and used a pressure gauge to check the compressor pressure (while idling). The pressure showed good, (actually a little high). The compressor does cycle (I get a drop in RPM when the compressor is off, and a rise in RPM when I deselect the A/C). I did notice that my passenger side radiator fan was not coming on when the A/C was turned on. I changed the 50A fuse discussed in other threads with a new one; did not change anything. I drove the car last weekend, and noticed that the fan does come on when the car got hot, so it is working, but it still blew ambient air. When I go full hot the car does blows HOT air, so I'm thinking that eliminates the heater control valve. I have used some old posts, and not all of my symptoms add up to a heater control valve or pressure sensor. I'd very much appreciate any help.

 

Symptoms:

- Blows ambient air through all vents

- All vents blow air

- When switched to full hot, car will blow significantly hotter air

- compressor seems to engage

- A/C Fluid pressure good

- Passenger side radiator fan does not come on when A/C engaged

- Changed 50A fuse with no change in symptoms

- Passenger side radiator fan comes on when car gets hot, so it does work

- Have not changed HCV or Pressure sensor

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Hi,

 

I had this same issue only a few months back.

 

It was fixed by changing the (HEATER VALVE XR840091 BOSCH) this is a jaguar part and is exactly the same as the original just minus a few hundred dollars :-) and the climate control panel (400820043D)

 

The reason for the panel to be change was, if the car blows hot air for a long time it can damage the connections of the circuit board at the rear.

 

However i would just change the HCV first since it is a cheep part and in expensive to do first.

 

hope this helps,

 

Dan

 

 

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