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Under dash noise passenger side and AC blows hot


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A clicking/tapping noise under the dash on the passengers side occurred this morning as I started my 1999 996. At the same time the A/C blew hot air. It sounds like the compressor is kicking in but hot air is all I get with the intermittent under dash noise. As always, you folks thoughts are very much appreciated.

Edited by Doug
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It seems that there may be a couple of things going on here. The compressor very possibly gave up the ghost but this under dash sound is perplexing. Hopefully someone here with a shop manual can post here whats down under the airbag that is a switch, a relay, or anything else that could cause a mechanical clicking noise as though something is trying to turn on and off. Thanks for your help.

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Thanks for responding Richard. It is difficult to pinpoint it that precisely but it's definitely a relay or actuator of some type that is located behind or very close to the passenger airbag. It almost sounds like a pump clicking as it pumps a line up to pressure and then stops after 10 or 15 seconds. A diagnostic would be nice but am just trying to figure out what I may have and whether it could be a DIY.

Is the noise coming from the passenger side dash vent? That's where the interior temperature sensor is located, and there is a small fan which blows air over it.

A diagnostic check should show up any faults in the control system.

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