GM A/C Thermal Limiter 6551258 / 6551259 (NOS, Boxed)

$39.99

type: Unknown Type
Vendor: CorvairFarmer

Description:

Genuine GM‑spec Air Conditioning Thermal Limiter, correct for 1960s–1980s vehicles equipped with the Frigidaire A6 compressor. This limiter protects the compressor clutch circuit from overheating and is essential for OEM‑correct A/C restoration.

A thermal limiter protects the A/C compressor circuit by opening the circuit if temperatures exceed safe limits, preventing harness melt or compressor damage.

Key Specs

  • Type: GM A/C Thermal Limiter

  • Component Marking: 6551259

  • Box Marking: 6551258

  • Voltage: 12V system

  • Terminals: 3‑prong configuration

  • Function: Over‑temperature protection for compressor clutch circuit

  • Era: 1960s–1980s GM factory A/C systems

  • Brand: Likely Buss / GM supplier (common for these parts)

This is a patented limiter assembly, used in millions of GM vehicles equipped with the A6 compressor.


🚗 Correct Applications

Thermal limiters were used across nearly all GM divisions:

GM Cars

  • Chevrolet: Chevelle, Nova, Camaro, Impala, Caprice

  • Pontiac: Firebird, LeMans, Grand Prix

  • Buick: Skylark, Riviera, Electra

  • Oldsmobile: Cutlass, Delta 88, 98

  • Cadillac: DeVille, Fleetwood

GM Trucks

  • C/K pickups

  • Suburban

  • Blazer

  • GMC Sierra / Jimmy

Why They’re Important

  • Required for concours‑level restorations

  • Prevents compressor clutch harness failures

  • Often missing or bypassed on old vehicles

  • NOS units are increasingly rare

Features: • GM‑spec thermal limiter assembly • Part numbers: 6551258 (box) / 6551259 (unit) • 3‑terminal design • Fits GM cars & trucks with A6 compressor • NOS condition with original packaging

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