allen96

Yes, I did that; don't judge too harshly. It couldn't have been more than a pint before I realized what a mistake I had made. I went to the garage and got out the wet vac and sucked the tank dry. I have not started the car. I may fill the tank with water and try to stir it up, then suck it out again. I think I should be ok since (1) I think this is just an overflow tank and (2) I haven't started the car so the coolant hasn't circulated at all. Worst case I mixed one pint of washer fluid on ~5 gallons of coolant--1:40. And there can't be that much detergent in there. I suppose I could drain and flush and refill but that seems like overkill in this scenario. Thoughts?

Mike Murphy

Guessing you are fine. You sucked out the fluid after all. While it’s possible that ‘some’ tiny amount dispersed (diffused?), I doubt it’s enough to make much of a difference.

But cooling system pros can weigh in.

allen96

Thx Mike. I just refilled and sucked plain water out until the water that came out was as clear as that going in--5 flushes of the reservoir. I'll admit that the 1st flush came out a bit sudsier than I expected, but by 5 it was clear as a bell. Hopefully, I am gtg.

Mike Murphy

I wouldn’t worry it

ZuffenZeus

I agree with Mike... no harm, no foul. Happens especially when you've worked all day and tired.

But don't shoot yourself in the foot again! Make sure you put the appropriate Porsche approved fluid back into the car. Don't mix regular green stuff with the pink stuff for example. Make sure it's made for Porsche M9X engines.

Bush Pilot

On the coolant, can't I use the stuff that's compatible with makes and models?

TexSquirrel

You should be fine using Pentosin or Zyrex coolant.
But I have always used the factory coolant in client 986/996 and my own 996.

Shawn Stanford

Not only was it certainly not worth the effort of flushing out the tank, it's questionable if it was worth sucking out the washer fluid at all.