Common problems

Why Is My R107 Footwell Wet?

Bright editorial illustration of a Mercedes-Benz R107 related to Why Is My R107 Footwell Wet?
Editorial illustration — not a photograph of a specific owned car

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Why Is My R107 Footwell Wet? diagram
Why Is My R107 Footwell Wet? diagram. ClassicMerc illustration — not a photograph.

Wet footwells are water management failures: cowl drains, top seals, windshield gasket, A/C drain, or a heater core. Find the source with a hose test before you buy carpet.

Related: A/C, soft top.

Leak sources

Cowl/windshield drains clog with leaves; soft-top well drains plug; windshield gasket leaks; A/C evaporator drain dumps into the cabin; heater cores smell sweet when they weep.

Hose test and fixes

Flood the cowl carefully and watch; check top wells; confirm A/C drain flow; dye for heater cores. Clear drains, renew seals, fix cores before new carpet traps moisture and rusts floors.

Common mistakes

Skipping cold and hot tests, trusting verbal history without invoices, replacing parts before measuring, and ignoring rust while chasing mechanical gremlins. Photos from another market or year are not a parts catalog.

When to stop DIY

Stop when you lack the gauge, puller, or safe support the job needs — or when the first repair did not change the symptom. Pay for diagnosis with someone who sees R107s regularly.

Practical takeaway

Carpet last. Water source first.

Shop notes and paperwork

Keep invoices, pressure readings, part numbers, and dated photos of the area before and after work. The next owner — or future you — will ask what was actually done. Verbal “we took care of it” evaporates at sale time.

Safety and scope

Use jack stands on solid ground, relieve fuel/coolant pressure before opening systems, and disconnect the battery when the procedure calls for it. If a step needs a specialty tool you do not own, rent it or hire it — improvising with the wrong lever is how fasteners and fingers break.

Verify against the factory manual for your engine and chassis. No invented personal car details here — use your plates, invoices, and measured symptoms.

Shop notes and paperwork

Safety and scope

If this topic intersects fuel, rust, or safety systems, fix the safety and leak paths before cosmetic or convenience items. That order saves money twice.

A little transparency

Owner guides & safety

Guides are general owner notes from Arthur's R107 experience, not a substitute for a qualified mechanic or a pre-purchase inspection on your car. Always confirm part numbers and fitment for your chassis before you buy.

Legal information

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