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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCoolant poluted with tap water
Leading reported evidence
Fill let me know
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1
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Read evidence and context
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Suggestion
Jay, if you want to borrow my AirLift system for the flush-and-fill, let me know.
Leading evidence: 'Fill let me know' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Fill let me know' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
As I am about to change the water pump, do I need to flush and refill with new coolant/distilled water mix, or just add some more of the proper coolant?
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Suggestion
As for the question about the coolant after adding tap water no one can say for sure but Porsche advises using distilled water with anti-freeze.
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Suggestion · Original poster
As I am about to change the water pump, do I need to flush and refill with new coolant/distilled water mix, or just add some more of the proper coolant?
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8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T112012Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Had to add approx 3 liters of tap water to my coolant tank due to a leak at the water pump while driving home
As I am about to change the water pump, do I need to flush and refill with new coolant/distilled water mix, or just add some more of the proper coolant?
Yes. Flush and refill. You need about 3 gallons Porsche coolant and 3 gallons of distilled water. Next time, top off with bottled water, that would have been a better choice than tap water.
That was some leaking water pump. It is a wonder it did not fail catastrophically. I have to stress that it really is risky to drive with a known bad water pump. The unit can go from noisy/leaking just a bit to the point the impeller blades make contact with the engine block and then you can have some real problems. Or the thing breaks and that ain't good either.
As for the question about the coolant after adding tap water no one can say for sure but Porsche advises using distilled water with anti-freeze. While there are some owners who have used tap water the numbers are so small we have no real data on this.
Thus to play it safe draining the coolant and refilling with a fresh batch of coolant consisting of the proper ratio of anti-freeze and distilled water is best.
An added benefit is the new water pump and the engine and its cooling system components start out with new coolant with all its ability to resist corrosion active and on the job, so to speak.
