Original BMW Coolant Temperature Sender with Warning Contact for BMW 535i, 535is, 630CSi, 633CSi, 635CSi, 733i, and 735i (1977–1988)

BMW's temperature sending unit with warning contact is the coolant temperature sender that drives the gauge and the 120°C warning signal on M30-powered E28 5 Series, E24 6 Series, and E23 7 Series cars, including the 535i, 633CSi, and 735i. It sits in a coolant passage and changes its electrical resistance as coolant temperature rises and falls, which the instrument cluster reads as a gauge position. The warning contact side is rated at 120°C. BMW has produced this sender since May 1975, and the genuine unit weighs 56 grams and is sold individually. A temperature gauge that reads erratically, stays too high, or stays too low can point to a failing sender or a sticking thermostat, so the two are commonly replaced together while the cooling system is open.

Original BMW Parts carry a 24-month parts warranty.

The sender serves the same role across three chassis and the six-cylinder M30 engine in many displacements, from the early 630CSi through the 535is. That shared application makes it a straightforward part to stock for owners running more than one classic BMW. Match the sender by part number before you order.

Technical Details

• Manufacturer: BMW
• Part number: 62-16-1-360-870
• BMW name: temperature sending unit with warning contact
• Warning contact rating: 120°C
• Weight: 56 g (0.1 lb)
• Production from May 1975
• Sold individually, one piece
• Original BMW Parts carry a 24-month parts warranty

Common Questions

Should I replace the thermostat at the same time?
Many owners do, because a faulty thermostat and a faulty sender both cause wrong gauge readings, and the cooling system is already open.

Does this fit the E24 and E23 as well as the E28?
Yes. It is shared across all three chassis with the M30 engine for the models shown above.

Fitment & Compatibility

Use the table below to verify the year and submodel for your build. PMB Performance can confirm this against your VIN, backed by more than 20 years of parts and fitment work.