Ok, so my CCU said my coolant circulation pump was faulty. I cleared out all the codes and this still came back up. I checked today with direct battery and it does not work.

I picked up a working replacement assembly from a local salvage yard, pump works fine, and I want to install it, here's the deal, am I going to have a coolant purge if I try to do this without draining the system? I'm tempted to try and do the install without draining off coolant but if it's going to create a mess I'll just drain down and flush the system and replaced the coolant. I suspect that it should be replaced anyway.

The pump is pretty high up in the system but there are five hoses connecting to the assembly so that's a lot of moving around to do before it's buttoned up again. Also there's the likelihood of introducing air into the system as well.

Thanks
Steve A

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Steve A
92 W140 OM603
97 VW Jetta TDI
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