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post #1 of 7 (permalink) Old 12-31-2019, 08:50 AM Thread Starter
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airco malfunction

Hi all,

during a long trip recently the airco on my Azure quit working. I heared a noise like a blowing fuse and it got cold inside. Tried to switch to eco and it became warmer only on full red and cooler only on full blue on the two regulators. On turning the regulators I can hear noises from behind the dash from small electric motors. Also the windscreen defrosting position works.

Any advise?


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post #2 of 7 (permalink) Old 12-31-2019, 12:42 PM
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You may have not enough gaz or a leak and the compressor stops to protect.
Don't know if you have basis in engine, check if the air con compresseur is engaged when A/C is on.
If not you need a specialist to cvacuum old gas, clean, check leaks, put a tracor, new gaz new oil.

If it's not that, you need Bentley Mastercheck to check messages. These are complex cars, with electronic, OBD is there to record what could go wrong. You should start by this and scan with the right tool.
Noise you hear are normal.

97 Continental R
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post #3 of 7 (permalink) Old 12-31-2019, 03:40 PM
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" I heared a noise like a blowing fuse and it got cold inside. "

If i understand you correctly, your interior is getting cold so i assume that the a/c is functioning and it's your heat failing. I this correct? Turning to eco will turn off the compressor. If your heater stopped functioning it's probably the heater valve or whatever actuates it that's failed.
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post #4 of 7 (permalink) Old 01-05-2020, 08:55 AM Thread Starter
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no, just the heating quit and could no longer be regulated . on eco the same. Only the windscreen defrost position works as it should.

any ideas?
post #5 of 7 (permalink) Old 01-05-2020, 10:40 PM
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I'm only going by memory here but I think the opening of the heater tap is controlled by a temperature sensor near the thermostat, this sensor will stop the heater tap from opening until the coolant has reached a certain temperature (can't recall what that temp figure is but I think it's 46 degrees c, I could be wrong) but the coolant tap is bypassed for the windscreen defrost which gets it's heat from a separate coolant bypass hose direct from the engine, this is designed so that the windscreen can be defrosted soon after the engine is started but the heater tap won't open until a sufficiently high coolant temperature is reached at the coolant sensor.
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post #6 of 7 (permalink) Old 01-09-2020, 09:27 AM Thread Starter
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thank you for this hint. will check the sensor.
post #7 of 7 (permalink) Old 01-09-2020, 04:23 PM
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Search here and the Australian forum for 44° sensor, unplug it to test. It has been discussed many times in the past with illustrations showing where to find it on the thermostat housing. It's the system inhibit sensor that prevents operation of the system until the coolant temp reaches 44°C.

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