BMW 11537509227 Thermostat Housing Sensor

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To replace the thermostat on E30 models with S14, M20, or M42 engines, start by draining the coolant and loosening the hose clamps or bolts on the thermostat housing. Remove the thermostat and install the new one, ensuring the support bar faces out for M20 and M42 models. Replace the O-ring and gasket where necessary and torque the bolts. For E36 models, disconnect the battery, remove the radiator trim cover, cooling fan, and hoses. Loosen the housing bolts and replace the entire unit if the thermostat is installed into the housing. Check the housing for cracks, replace the seal, and install the new thermostat with the air bleed hole up. Coat the bolts with anti-seizing compound, tighten them, and reassemble the remaining parts. Finally, bleed the cooling system and enter the radio security code.

Non-toxic coolant is available at most auto parts stores. Although the coolant is non-toxic, proper disposal is still required. A new thermostat sealing ring and (where fitted) housing gasket/seal will be required on installation. To remove the thermostat, disconnect the cable from the negative terminal of the battery. Drain the cooling system. Where applicable, to improve access to the thermostat housing, remove the cooling fan and viscous coupling. Pry out the locking wire clips and disconnect the coolant hose(s) from the thermostat housing on the front of the cylinder head/timing chain cover (as applicable). Disconnect the electrical connector from the thermostat housing. Unscrew the retaining bolts and remove the thermostat housing. Recover the housing gasket/seal. It will be necessary to unbolt the engine lifting bracket to allow the housing to be removed. Note that the thermostat is integral with the housing. Recover the sealing ring. Installation is the reverse of removal, bearing in mind the following points. Replace the thermostat housing O-ring seal. Tighten the thermostat housing bolts to the torque. Reinstall the cooling fan. On completion, refill the cooling system.