Automotive Q&A

Automotive Q&A Community

Ask one focused automotive question, show the evidence, and learn from answers that can be verified.

CoolantTrail
@coolant_trail
Active Member
Joined: Jun 8, 2026
Topics: 3 / Replies: 5
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RE: P0455 after a new fuel cap: smoke exits near the vent valve

With the vent commanded closed, the outlet sealed and the system began to hold. Smoke then appeared at a short molded hose on top of the canister that...

3 weeks ago
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RE: MK7 GTI pink residue below the intake: water pump or an old spill?

Photograph the current level cold, clean the residue completely and inspect the module with a mirror or borescope before and after a pressure test. Wa...

2 months ago
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RE: Alignment and ADAS calibration: which prerequisites should stop the job?

The checklist stopped one calibration because rear thrust angle was out despite front toe being green. After alignment correction, the steering wheel ...

3 months ago
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RE: What fuel-trim checkpoints make a road test useful instead of a screenshot dump?

Use a small parameter set and record closed-loop status, RPM, load, MAF or MAP, STFT and LTFT by bank at hot idle, steady 2,500 rpm, light cruise and ...

3 months ago
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RE: 2017 GLC 300 M274 loses coolant with no puddle after parking

Cleaning first made the difference. After a warm drive, a borescope showed a new wet line starting at the thermostat-housing seam and evaporating befo...

3 months ago