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Aux. Pump is designed to run continuously whilst with the ignition on. 👍

I’d agree that you’d be better with two fans in operation as when the stage 2 fan engages as that’s the idea, one fan isn’t enough as the temp has gone so the rad sender engages the second stage, going from one fan to the other won’t improve your cooling one bit. It’s a nice little project sorting the fans and wiring out. Something else to bear in mind is the auxiliary water pump, you need to see how he’s wired the fans. If he’s bypassed the main fan controller unit chances are this won’t be running if the fans come on when you turn the engine off. You can tell if the auxiliary pump is working by just turning the ignition on without engaging the starter motor, you should hear the pump run for 30 seconds or so, no buzzing and it is duff.

It does look a clean looked after car. As Keyo says bridge the rad switch plug to bring the fans on if they don’t or one doesn’t there an issue with a relay unless he’s wired direct off of the existing fan plug. Do the above test and take some photos of the wiring, there’s a few ways he could have wired it up. When you press the override switch what happens then, do they both come on? You should be able to get both fans on without the ignition on as well simulating after run by bridging the rad sender plug.

That is one great looking car and with a lot of nice goodies, not much it doesnt have. Great cars are worth paying for. Just a few niggles to sort out, but there is always something that is needed with all our cars Well done in getting her 👍

This is a late genuine fan switch from a good seller - check your pin lay out is that same as in a triangle as early has a horizontal 3 pin lay out. On diagram there is no sealing washer. https://www.deutsche-parts.co.uk/1h0959481b-switch-new-genuine-part.html

Congratulations on the purchase - saw this car and went for a good price considering the work carried out and the recaro seats and alloys. Aftermarket Slimline fans - Shaun is the man for them on here- sounds to me likely to be set up wrong in the first place- if you search cooling guide on here its very informative - you can test by bridging all 3 speed settings. The fan control unit is a common failure point as well due to age . Basics first are to bridge the fan switch sensor (one in radiator) plug for settings 1 ignition off- setting 2 bridge same plug but different pins ignition on - settings 3 bridge the the black coolant sensor plug ignition on that is in a row next to the other 2 coolant sensors .