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MOTRS

850 / 850 T-5R / 850R

1991-1997 / Sedan / Estate / Sweden

All 850 / 850 T-5R / 850R problems All workshop issues
Common Cooling System

Cooling Fan Failures

Symptoms

The temperature gauge climbs in traffic or at idle. The radiator fan doesn't spin up when it should.

Cause

Failed fan relay, temperature sensor, or the fan motor itself has died. On 850s, there are multiple temperature sensors and it's often the one for the fan circuit, not the gauge.

Fix

Test the fan by jumping the relay or running 12V directly to the motor.

If the motor works, replace the relay ($20-40) or temperature sensor ($40-80).

If the motor is dead, replace the fan assembly ($150-250).

You can wire a manual override switch as a temporary fix, but it's not a long-term solution.

Cost mentioned in fix
$20-40$40-80$150-250

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Other known issues

Common Cooling System

Radiator and Expansion Tank Cracks

Coolant loss, overheating, the temperature gauge climbing past 12 o'clock. You might see pink coolant pooling under the car or steam from the bonnet.
Common Cooling System

Heater Core Leaks

Sweet smell in the cabin, fogged-up windscreen, wet passenger footwell. Coolant loss with no visible external leak.
Common Engine

PCV System Oil Leaks and Breather Box Failures

Oil everywhere, particularly around the back of the engine and firewall. You might see smoke at idle or a rough idle. In severe cases, the turbo oil feed line can blow apart because the crankcase is pressurised like a balloon.
Critical Engine

Timing Belt and Water Pump

The engine suddenly stops. If you're lucky, nothing else happens. If you're not, you've just destroyed pistons, valves, and possibly the head. This is an interference engine.
Critical Engine

Oil Consumption (Turbocharged Models)

You're adding a litre of oil every 1000-2000 km. Blue smoke on startup or under boost.
Common Engine

Turbo Failure (T5 and 850R)

Loss of power, screaming noises, oily exhaust smoke. The car feels gutless and the boost gauge stays flat.
View all 26 850 / 850 T-5R / 850R problems