Thermostat, replace. S14

# Thermostat, remove and install. S14

The thermostat on an S14 engine is a large assembly located inline with the lower radiator hose, above the air conditioning compressor on the right side of the engine. The assembly is sealed and non serviceable. |
Drain coolant from radiator. Drain plug is located either in center of lower tank or on the left lower corner. Drain plug is plastic, do not force. Do not over tighten. |
Disconnect temperature switches if they are located on thermostat. The wires to the dual temperature switch (green arrow) often break at the connector. Use this procedure to repair them. |
Loosen the three hose clamps. |
Remove thermostat. Removal may be easier if lower radiator hose is totally removed. |
After installation of new thermostat, refill engine with coolant and run for 2 or 3 minutes with radiator cap off and heater turned to full hot, this will allow any trapped air to make its way out of the system.

### Checking thermostat

Place thermostat in a pot of water and heat.
Thermostat should begin to open at 80± 2° C (176± 3° F). Full opening of 8mm should occur at 95°C (203° F).

### Part Numbers :

Thermostat | : | 11 53 1 315 537

E30 M3 Repair Manual V2.7. Copyright ©1999-2001 Koala Motorsport & Brett Anderson