Engine fan on at startup?
- Thread starter Wildfire
- Start date
Wildfire said:
Hi, my si did that & its the Cars way of trying to compensate for a failing water pump! I’d order one now and stop using the car before you flambé the magnesium engine
Get the codes read to be sure but that’s a mirror image of my cars behaviour, I had no warning lights up but stored codes of “implausible pump speed” were logged.
Rob
Yup, common side effect of a failing water pump, BUT as said, I would have the codes read first rather than just shelling out for a replacement.
Not a difficult job to DIY, and parts aren't too bad. I did one recently and a genuine pierburg pump plus a branded thermostat, BOTH with lifetime unlimited mileage warranty came to £370 inc vat. There are pierburg pumps on eBay for I believe around £240-250 but I thought £370 all in for both was a better deal, especially as if they ever fail again they will be replaced FOC.
Refilling the cooling system can be tricky, bmw insist on using a vacuum filling unit, which does the job correctly in minutes. I have only done them using the correct tool and automatic pump bleeding sequence, which runs the water pump for 12 mins continuously with the engine off and cold. But in order to do that you need a constant voltage supply connected to the battery as the ign, interior fan and dipped headlights need to be on for the full 12 mins. This draws about 40 amps, so you must have a diagnostic support unit attached to the battery that is capable of supplying the required current while maintaining 13v+
I can imagine it being a nightmare to vent the air from the system without the above.
Mike
Not a difficult job to DIY, and parts aren't too bad. I did one recently and a genuine pierburg pump plus a branded thermostat, BOTH with lifetime unlimited mileage warranty came to £370 inc vat. There are pierburg pumps on eBay for I believe around £240-250 but I thought £370 all in for both was a better deal, especially as if they ever fail again they will be replaced FOC.
Refilling the cooling system can be tricky, bmw insist on using a vacuum filling unit, which does the job correctly in minutes. I have only done them using the correct tool and automatic pump bleeding sequence, which runs the water pump for 12 mins continuously with the engine off and cold. But in order to do that you need a constant voltage supply connected to the battery as the ign, interior fan and dipped headlights need to be on for the full 12 mins. This draws about 40 amps, so you must have a diagnostic support unit attached to the battery that is capable of supplying the required current while maintaining 13v+
I can imagine it being a nightmare to vent the air from the system without the above.
Mike
Wildfire said:
£310 for just the pump? If so, that's not cheap!
Mike
Wildfire said:
I can get you the pierburg pump, and an oem stat, both with lifetime unlimited mileage warranty from ecp for £370 inc vat. Here's an invoice from last week showing warranty and retail prices which are plus vat..
Mike
Ok, so I've made it home the 150 miles. The car only seems to do it when totally cold?
Still pointing towards the water pump?
Anyhow I've plugged the code reader in and there is nothing stored and all monitors etc. are ok. As I've just hit 73k I am thinking of having it replaced as a preventative measure as I need the car over Christmas.
Still pointing towards the water pump?
Anyhow I've plugged the code reader in and there is nothing stored and all monitors etc. are ok. As I've just hit 73k I am thinking of having it replaced as a preventative measure as I need the car over Christmas.
As Rob said earlier, code read is needed. A lot of the cheaper obd ones will either not talk to the modules needed, or read pending codes.
Mike
Mike
Wildfire said:
You near me? I'm NW London
Wildfire said:
You are pretty much on the mileage for it being done tbh. I would change the stat whilst you are in there as well. They aren't known for failing, but they are an electrically controlled stat rather than a traditional wax capsule one so I would change it, although if the stat fails, it should fail safe, ie open rather than closed.
Mike
North West Surrey
Wildfire said:
You can DIY it in an hour, the pump comes with the one use alloy bolts for mounting it.
Mike
Wildfire said:
Well if you're passing I can do a proper stored code read for you.