Volvo FH/FM Dash Air Vent Diffuser 20911930 3175580 IPN 13771 LH Euro 5/6

Description:
This listing is for a genuine Volvo dash air vent diffuser set for heavy-duty trucks, OEM part number 20911930 with internal code 13771. It is an original Volvo HVAC air distribution nozzle used in the dashboard to direct conditioned air into the cab. The set comprises two matching adjustable vents in black ABS/PC plastic: one installed in the original bezel with circular cut-out for the headlight/lighting switch, and one standalone vent module. This configuration is typically fitted on the left side of the dashboard on Volvo FH and FM trucks and is also used on certain Volvo VNL and Mack applications as a cab air diffuser.

The vents feature adjustable horizontal and vertical fins and an integrated thumb wheel shutter to regulate or close airflow. OEM markings on the rear confirm VOLVO logo, main part number 20911930, mould number 13771 and material ABS/PC, with manufacturing country marked as CHINA. According to Volvo and aftermarket catalogues, this diffuser corresponds to air outlet/dash vent references 20911930 and 3175580, and cross-numbers including 13771, 13771-1, 13771-2 and V-6-170-006.

Compatibility (to be confirmed by buyer):
Known applications from parts catalogues and dealer listings indicate use on Volvo FH and FM series trucks (various Euro 5 and Euro 6 models) as a cab air diffuser / dash air vent. The same part number is also listed for Volvo VNL and for Mack CH series trucks as a heater/AC air vent. For best results, match by OE number 20911930 or 3175580 and by shape of the existing dashboard opening and switch bezel on your vehicle before purchase.

Condition and testing:
The donor truck’s HVAC system and vents were checked prior to dismantling to ensure correct airflow and smooth operation. After removal, the vents were visually inspected and graded. There are minor cosmetic marks and light scratches consistent with normal use, but no broken fins or mounting points observed. Thumb wheel shutters and directional vanes move freely and close properly. The plastic surfaces have been wiped down; some further cleaning may be required. This is a used genuine part, graded B, fully functional with 3‑month warranty from the date of purchase.

Installation notes:
Direct replacement for the original Volvo dash vent assembly. No coding or programming is required as this component is purely mechanical. Professional installation is recommended to avoid damage to the dashboard trim and to ensure correct seating of the bezel and vent. Please transfer any additional switches or trim pieces from your old unit if required, as only the parts shown in the photos are included.

Warranty and returns:
The item is supplied with a 3‑month warranty covering functionality under normal commercial vehicle use. We offer a 30‑day return period; buyers must match part numbers and compatibility before ordering. Returns are accepted if the item is faulty or not as described; buyer is responsible for return shipping. The part is used, so minor cosmetic imperfections are to be expected.

Shipping & Returns:
We ship across UK/EU with tracked services. Returns accepted within 30 days; buyer pays return postage. Please inspect upon arrival and message us with any concerns.

Why Buy From Us:
Genuine part, 3-month warranty, fast dispatch, secure packaging.