Re: clicking sound

["Eric Renneisen" <renneie@hlthsrc.com>]

>The consensus is that the relay does click, but I don't
>know that we ever figured out why they do this...
>
>Anyone know for sure?

The wiring diagram shows a temperature sensor in the 
bottom seat cushion with the heating element. This 
system is analogous to the AC compressor and inside 
temperature sensors. Once the temperature of the cabin 
reaches the selected temp on the auto climate control 
head, the AC compressor will begin to cycle more 
frequently as the temperature hovers around the set 
range.

>From what I understand, before total failure of a heating
element, there is often a spot of intense heat. If that 
spot happens to be near the temp sensor, then very 
shortly after the relay switches on, the sensor would 
tell it to switch off. This may be the cause of excessive 
cycling of the seat heat relay, especially if the seat 
never seems to warm up as much as it should.

Eric Renneisen
'90 CQ 20V  -  my 'racing-iron'  ;^)
Chattanooga, TN