Cooling circuit bypass solenoid

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dnsey
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Cooling circuit bypass solenoid

Post by dnsey »

Lexia tells me that I have a permanent fault with this solenoid (HDi 2.0 16v).
I know where it is, and can surmise what it does, but when and why does it do so?
In other words, is it worth replacing this pricey part, when I've noticed no problems?
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Lighty
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Re: Cooling circuit bypass solenoid

Post by Lighty »

Had a customer who's car put the red light on in France at 30 odd degrees air temp when towing his caravan up a hill. This fault showed, but could never see if it cured it .
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dnsey
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Re: Cooling circuit bypass solenoid

Post by dnsey »

I suspect that the bypass circuit is opened when starting from cold, to allow faster warm up of both the engine and the cabin; a sort of extra thermostat controlled by the ECU. If it stayed open, I'd certainly expect overheating under heavy load. In my case, the solenoid is 'shorted to positive' in Lexia's terms, so probably not opening the bypass.
Apart from longer warm-up time, and consequently slightly higher fuel consumption and emissions when cold, will there be any other adverse effects?
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