Mr. Zadir Report post Posted September 21, 2017 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 Quote Share this post Link to post Share on other sites More sharing options...
daniel1986 Report post Posted September 23, 2017 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 Quote Share this post Link to post Share on other sites More sharing options...
KaiatEliteMS Report post Posted September 23, 2017 It's probably the compressor Quote Share this post Link to post Share on other sites More sharing options...
StoleIt Report post Posted September 23, 2017 It's probably the compressor Even though his compressor is turning on/off? Quote Share this post Link to post Share on other sites More sharing options...
KaiatEliteMS Report post Posted September 25, 2017 Usually the shaft breaks while the compressor still goes on and off hence resulting it not working properly Quote Share this post Link to post Share on other sites More sharing options...
CPUNLAMD Report post Posted November 5, 2017 any updates? Would like to know if changing the HCV fixed your AC issues. Quote Share this post Link to post Share on other sites More sharing options...
STEEVE1234 Report post Posted February 9, 2018 Probably the compressor Quote Share this post Link to post Share on other sites More sharing options...
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