Vehicle : '65 Citroen C4 Cactus 1.6 BlueHDI
Initially, Engine fault would come on screen, and radiator fan would run at high speed only. No rpm restrictions, and I (foolishly) put this in the "must fix this later" pile, as it had no real impact on using the car. This would occur with or without A/C being turned on.
More recently, when A/C is turned on, within 1-2 minutes, same error comes on screen, radiator fan does *not* run, and rpm is restricted to 3k. With A/C off, this fault does occur but less frequently and I can't replicate it reliably.
A basic phone OBD reader does not reveal any fault codes, and shows coolant temperatures between 85-99 when in fault status.
I'd appreciate any advise. From my online searching changing the fan motor relay 1267J6 appears to be a first step, any wisdom gratefully received!
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what happens if you disconnect the coolant temp sensor with the engine running? within a few seconds the cooling fan should come on at full speed. Be aware that doing this will log a fault code with the coolant temp sensor circuit.