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MOTRS

KE70 Corolla

1979-1983 / Sedan / Coupe / Japan

All KE70 Corolla problems All workshop issues
Common Cooling System

Heater Tap Failure

Symptoms

Coolant leak from the heater tap (located on the firewall). Wet carpet on the passenger side. Sweet smell of coolant inside the cabin. Loss of heating function.

Cause

The heater tap is a vacuum-operated valve that controls coolant flow to the heater core. The vacuum diaphragm perishes, or the tap body corrodes and leaks. After 40+ years, these are living on borrowed time.

Fix

Replace the heater tap.

Universal heater taps are available for $20-40 and are a straightforward replacement.

Some owners bypass the heater tap entirely with a manual inline valve ($10).

Cost mentioned in fix
$20-40$10

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Other known issues

Minor Rust and Corrosion

Rear Quarter Panel Corrosion

Bubbling paint on the rear quarter panels, progressing to perforation. Rust visible inside the boot behind the wheel arch trim. In severe cases, the inner wheelarch structure is completely gone and the outer skin is all that's holding the shape.
Common Rust and Corrosion

Boot Floor and Spare Tyre Well Corrosion

Soft, rusted, or perforated metal in the boot floor. Water pooling in the spare tyre well. Damp smell from the boot. Rust staining on the boot carpet.
Minor Rust and Corrosion

Sill (Rocker Panel) Corrosion

Paint bubbling along the sills below the doors. Soft metal when tapped. In severe cases, the sill collapses when jacked, and the door gaps change as the body flexes.
Minor Rust and Corrosion

Floor Pan Corrosion

Soft or perforated floor pans. Visible rust when the carpet is lifted. In extreme cases, you can see the road through the floor.
Critical Engine, 3K-C and 4K-C Pushrod Inline-4

Oil Leaks

Oil weeping or dripping from multiple points on the engine. Oil residue on the rocker cover, sump, and rear of the engine. Oil spots under the car.
Common Engine, 3K-C and 4K-C Pushrod Inline-4

Timing Chain Wear

Rattling or slapping noise from the front of the engine, most noticeable at cold start and idle. The noise may diminish once the engine warms up and oil pressure stabilises the tensioner.
View all 16 KE70 Corolla problems