A vibration label is not a diagnosis; its speed, load, temperature and operating state must be recorded before a candidate can be valued.
Define the decision
First identify the engine, transmission, wheel and tyre package. Observe the cold start, idle in each permitted gear state, reverse and forward take-up, steering load and air-conditioning engagement. Then map every symptom by engine speed, road speed, gear, throttle, braking, turning, surface and temperature. Do not call normal three-cylinder character, DCT take-up or a tyre pattern defective without comparison evidence.
Evidence to collect
Inspect engine and transmission mounts, fasteners, exhaust clearance, undertrays, wheel damage, tyre matching, bearings, suspension joints and evidence of collision repair. Scan the powertrain and chassis modules. Record audio or video from consistent positions during low-speed manoeuvres, acceleration, coast, braking and a hot restart, then repeat the condition that produced the symptom.
Risk and export exposure
A wheel-speed vibration can be misdiagnosed as an engine mount; a misfire can be mislabelled as normal vibration; and a bent shield can imitate internal engine noise. Mount replacement may hide collision geometry or fluid leakage without fixing the cause. Safety-related steering, braking or drivetrain symptoms require professional diagnosis, not a seller discount. Compare road-speed symptoms with the tyre, wheel and TPMS check and chassis symptoms with the suspension, steering and brake route.
Apply it to a candidate
For a candidate that shakes only during hot reverse engagement, compare engine speed, DCT behaviour and mount movement rather than replacing tyres. For vibration rising strictly with road speed, inspect wheels, tyres and bearings first. Keep the VIN on hold until the symptom is repeatable, its cause is supported and the repair boundary is priced.
Build the VIN record
Create a dated folder named by VIN. Record exact powertrain and wheels, cold and hot symptom map, mount and exhaust inspection with source documents, photographs, diagnostic output or inspection results. Keep wheel and suspension check, diagnostic scan, repeatable road test as named actions until the responsible reviewer closes them. A replacement vehicle starts a new file rather than inheriting another candidate's evidence.
Independent review
Assign each field to a reviewer with the relevant competence. Technical, legal, shipping and destination questions should not be answered by one general seller statement. If records conflict, preserve both versions and request the exact document, test or image that resolves the difference before payment.
Commercial hold points
Connect payment to evidence. Confirm identity before reservation, condition before final technical acceptance, contract wording before a major transfer and loading condition before handover. A changed VIN, beneficiary, delivery point or accepted exception reopens the relevant approval gate.
Arrival and ownership control
Freeze the odometer, warning state, keys, accessories, body condition and unresolved exceptions before loading. Compare the arrival vehicle with that record before cleaning or repair. Preserve evidence for claims and give the destination workshop the exact version, service and diagnostic baseline.
Stress-test the buyer's preferred choice
Model one adverse but plausible outcome involving exact powertrain and wheels, cold and hot symptom map, mount and exhaust inspection: a delayed part, an inconsistent document, a warning that returns after a drive, or destination advice that changes the budget. Decide in advance which outcome triggers further inspection, a retained reserve or rejection. This makes the purchase resilient to ordinary uncertainty without pretending every risk can be eliminated.
Close the record after arrival
Compare actual arrival condition and expenditure with the assumptions for wheel and suspension check, diagnostic scan, repeatable road test. Preserve loading and terminal evidence until custody, damage and included-item questions are resolved. Update the file with the first inspection and service so the next owner or workshop receives a reliable starting point rather than a collection of sales messages.
Write the approval result
Finish with pass, hold or reject. A hold must name the missing evidence, owner and deadline. Approval means the buyer understands the remaining limits; it does not turn an unknown into a confirmed feature or remove destination responsibility.
Record the evidence date and the person who reviewed it. If a candidate changes, repeat the affected checks instead of carrying an earlier approval to another VIN, model year or seller.
Diagnose Coolray Vibration, Engine Mounts and Road-Test Noise: checklist
Mark every item confirmed, unresolved or rejected and link its evidence to the candidate VIN.
- Exact powertrain and wheels
- Cold and hot symptom map
- Mount and exhaust inspection
- Wheel and suspension check
- Diagnostic scan
- Repeatable road test
Primary manufacturer references
Use these sources for context only; the candidate remains market-, year-, trim- and VIN-specific.
Official Geely New Coolray model page ↗Buyer questions
Is every three-cylinder vibration a fault?
No. Compare with correct references, but investigate new, severe or state-specific vibration.
Can an engine mount cause a DCT-like shudder?
It can transmit or amplify movement, so the gearbox and mounts must be assessed together.
Why record road speed and engine speed separately?
It helps distinguish wheel-speed, engine-speed and gear-dependent causes.