Porsche Club GB

Nasty Hissing Sound when Washing Car

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2 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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YOUR RESEARCHNasty Hissing Sound when Washing Car

Reported or suspected cause

exhaust

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause: 1
Suspected cause: 0
Reported fixes

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Discussions that suspect a cause: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suspected cause · Original poster
I am worried the water could have hit the hot engine or whether it was the exhaust.
Original post Read captured discussion
Nasty Hissing Sound when Washing Car

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Leading evidence: 'exhaust' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'exhaust' (1 discussions; 0 report identifying it and 1 suggest it). No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

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1 matching discussions · 2 captured posts examined · 0 partial discussions

Reported and suspected causes (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

exhaust

No successful repair reported for this finding.

0
Identified cause: 1
Suspected cause: 0
Reported fixes

Read evidence and context

Discussions that suspect a cause: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suspected cause · Original poster
I am worried the water could have hit the hot engine or whether it was the exhaust.
Original post Read captured discussion
Nasty Hissing Sound when Washing Car

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Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

2 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Porsche Club GB: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T122219Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi All, Drove my new-ish C4 home and decided to wash it immediately with a bucket of water/car shampoo. After pouring some water on roof/rear screen,. I noticed a nasty hissing sound for a few secs which sounded like water hitting hot metal. I am worried the water could have hit the hot engine or whether it was the exhaust. Could an engine/exhaust etc really be damaged by doing this (ie. crack in engine itself) and how can you prevent it when the rear spoiler slats seem to funnel water in the engine bay anyway? Just wondering if this is something that has happened to anyone else? Thanks, Steve

POST 2Original post

The slats are to let air in to cool the engine bay, and water gets in just as easily. It will be happening when you drive it in the rain too! I don't wash mine when it is very hot - only because the bodywork around the engine bay dries too quickly - but I'm sure it won't do any harm as long as you don't pour a bucketful straight into the engine.

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