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[dave the builder]

What relay controls the auxiliary fan and what one controls the main fan?

Tolerance data shows omega 2.2 2001 on z22xe as follows
left to right
unoccupied in your pic =k36 headlight washer
gap
blue relay k24 cooling relay 3
green relay k62 ac compressor
green relay k25 cooling relay 4
green relay k06 cooling relay
brown relay k23 cooling relay 2 (which is a changeover relay 5 pins)
black relay front k10 wiper interval
purple relay k49 fuel pump

above K10 is 2 fuses 40a and 30a both rad fan fuses

2 thermo switches

fusebox
f52 = 30a
f29 = 10a
f62 = 40a

[Andy A]

From memory, the front fan on a desmond does have the two speeds but there's a series resistor that drops some volts for the low speed, being that there aren't 2 motors to put in series.

Will see if I have wiring diagrams on this laptop to confirm...

Confirmed the front fan has only 2 wires.

I've checked all relays off the car and they are all working fine.

I just don't have the high speed on the front fan.

I need to sort this soon because were going on holiday and taking the car.

[Doctor Gollum]

Could be a failed thermoswitch... Two on the radiator, one for each fan.

Live test...

Start engine, set climate to LO both sides, aircon on ie not ECO, and fan on lowest setting. Leave to idle. Once upto temp you should hear the fans kick in and then cut in/out to regulate the temperature. Gauge movement should confirm temp.

If the aircon isn't working, then all bets are off as that will affect correct fan operation