Black drive belt on white background
Black drive belt on white background

A35/4L370 HVAC V-Belt — Lennox 25P04 Cross

Price
$43.99
Title: OEM Genuine

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BELT SLIPPING, SQUEALING OR WORN?

A35/4L370 HVAC V-Belt — Restores Blower Speed & Airflow

Wrapped A-section / 4L drive belt for compatible HVAC blowers, fans, pumps and equipment drives.

A35 / 4L37037" Outside Length1/2" Top Width40° Profile
Fitment rule: No manufacturer-published model-level list was verified. Match the complete A35/4L370 marking, 1/2-inch profile and 37-inch outside length—not equipment type alone.

Verified Cross-Reference Information

Industry NumbersA35, 4L370
Lennox / Browning25P04
Greenheck345064 / 4L370
Dimensional FHP EquivalentGates 6837 / 4L370K

Important: The Gates FHP number is a dimensional equivalent. Cover, cord and duty construction can differ from a wrapped classical belt.

Size & Application Data

Outside Length37" / 940 mm
Top Width1/2" / 12.7 mm
Nominal HeightApproximately 5/16" to 11/32", depending on product line
IncludedOne new wrapped drive belt

Common Problems This Belt May Correct

  • Startup squeal, chirp or belt slip
  • Weak airflow or a fan, blower or pump running slowly
  • Black belt dust around the sheaves
  • A cracked, glazed, stretched or frayed belt

Check Before Ordering

  • Read the complete number printed on the old belt.
  • Confirm the 1/2-inch A/4L profile and 37-inch outside length.
  • Inspect sheaves for worn or widened grooves.
  • Check alignment, bearing drag and belt tension.
Pro Tip: Correct worn sheaves, misalignment or failing bearings before installing the new belt.

Installation Notes

  1. Disconnect and lock out power.
  2. Release tension according to the service manual.
  3. Do not pry the belt over a pulley.
  4. Align sheaves and set specified tension.
  5. Rotate by hand, reinstall guards and test.

Frequently Asked Questions

Are A35 and 4L370 the same nominal size?
They are commonly dual-designated for this 1/2-inch, 37-inch outside-length size. Construction can still differ by product line.

✓ Model-Specific Repair Pages

Frigidaire 1 Dishwasher Parts & Repair Guide

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Address
101 Trillium Dr
Kitchener, Ontario N2E 1W8
Phone
1-877-899-7278
Hours
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What Customers Say

4.70 ★ (288)
Verified

All brand names are the property of their respective owners and are used for compatibility reference only.

Exact and OEM references: A35, 4L370, Lennox/Browning 25P04, Greenheck 345064 / 4L370. Dimensional FHP equivalent: Gates 6837 / 4L370K; verify construction and duty rating.

No manufacturer-published model-level list was verified. Match by A35/4L370, 1/2-inch top width and 37-inch outside length.