Control of the ventilation fan in SWMBO's Corsa is achieved by large green cement resistor with taps at speeds 1, 2, and 3 (speed 4 is flat out, no resistance or current limiting in circuit).
The body of the resistor is mounted on a metal bracket and the
+12volts is fed to the resistor through a thermal cutout mounted above (?) the resistor, spot welded to the iron (?) terminals.It would appear the current limiter largely exists to monitor the cooling effect of the airflow through the fan, or then again maybe it doesn't.
The whole assembly has a scandalous price and on SWMBO's vehicle the thermal cutoput keeps on blowing. I have bought replacement thermal cutouts but mounting them is a problem because the originals are spot welded.
I was wondering if the cutout is there to monitor the temp. of the whole assy. It is not in circuit at the fastest speed and the performance of the fan then is entirely normal.
Has anybody any better idea what this sorry mess is intended to achieve?
Right now I'm more or less set to bodge it without the current limiter
Derek