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MOTRS

HK-HG Monaro / GTS

1968-1971 / Coupe / Australia

All HK-HG Monaro / GTS problems All workshop issues
Common Pillarless Coupe, Specific Issues

Frameless Window Seal and Alignment

Symptoms

Wind noise at speed, water leaks in rain, windows don't seal against the roofline rubber, windows rattle when closed.

Cause

The pillarless coupe's frameless windows rely on precise alignment between the glass, the window regulator mechanism, and the roof seal. Over decades, the regulators wear, the guide channels distort, and the rubber seals deteriorate. Without a door frame to guide the glass, even small misalignments cause problems.

Fix

Full window seal replacement and regulator adjustment.

New roof rail seals, door seals, and quarter glass seals are available from specialists.

The window regulators may need rebuilding, worn gears and guides cause poor window travel.

Budget $500-1,000 per door for a comprehensive seal and regulator overhaul.

This is fiddly, patience-testing work that rewards experience.

Cost mentioned in fix
Budget $500-1,000 per door

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Other known issues

Critical Pillarless Coupe, Specific Issues

Body Flex (Coupe)

Doors don't close properly on uneven ground. Dashboard cracks. Windscreen seals pop out. Creaking and flexing noises over rough roads.
Critical Engine, Chevrolet V8 (327ci / 350ci)

Intake Manifold Gasket Leaks

Coolant leak at the front or rear of the intake manifold. Coolant may drip externally or, worse, leak internally into the engine oil. May also cause a vacuum leak, resulting in rough idle and poor fuel economy.
Common Engine, Chevrolet V8 (327ci / 350ci)

Rochester Quadrajet Carburettor Issues

Hesitation on acceleration (bog), flooding, fuel smell, hard starting when hot, black smoke, erratic idle.
Critical Engine, Chevrolet V8 (327ci / 350ci)

Overheating Under Load

Temperature gauge climbs on highway drives, particularly towing or climbing hills. May push coolant out the overflow. Engine pings (detonation) under load.
Common Engine, Chevrolet V8 (327ci / 350ci)

Hydraulic Lifter Noise

Ticking or clattering from the top of the engine that varies with RPM. May be audible at idle and disappear at higher RPM, or vice versa.
Common Engine, Holden Six (186ci) and V8 (253ci)

Oil Leaks, Rear Main Seal

Oil drips from the bellhousing area. Oil accumulates on the underside of the engine and transmission.
View all 18 HK-HG Monaro / GTS problems