EURORELIC

61 31 1 378 073 –Double temperature switch (91/99CEL)

Available newchecked 2026-10-08source: bmwpartsdeal.commarket: US (EU: not orderable)

BMW part number 61 31 1 378 073 (61311378073) is the Double temperature switch (91/99CEL), a cooling part catalogued for the E34 (518g, 518i, 520i), E36 (316i, 318i, 318is), E30 (316i, 318i, 318is), E32 (730i, 730iL, 735i), E31 (840Ci, 840i, 850Ci), E24 (635CSi, M635CSi, M6) and 2 more chassis. As of our last check (2026-10-08, bmwpartsdeal.com), it is still available new from BMW. 1 repair guide below.

  1. 1 New from BMW
    Listed as orderable new by the status source.
  2. 2 Aftermarket new
    No sourced aftermarket equivalent yet
  3. 3 Used / NOS
    Search live listings on eBay US/DE.
  4. 4 Interchange
    No cross-model match in our data
  5. 5 Kit / reman
    None recorded yet
  6. 6 Community fix
    No forum workaround recorded yet
  7. 7 DIY guide
    1 repair how-to linked (forum, article, video)
  8. 8 Paid hunt
    We search dealers, breakers and forums for you.

Buy new

Listed as orderable new at bmwpartsdeal.com when checked.

View 61311378073 at bmwpartsdeal.comCross-reference 61311378073 on RealOEMCatalog diagram (bmwfans.info)

Aftermarket options (0)

No sourced aftermarket equivalent recorded yet. We only list brand numbers that a brand catalog or vendor page explicitly cross-references to this BMW number.

Where to buy

Every link opens 61311378073 at that seller: “View” = the part’s own page, “Look up” = the seller’s part-number page, “Search” = the seller’s search pre-filled with the number. You can order from either region.

United States

Europe (DE · UK · DK)

“Ships internationally” is shown only where we read it on the vendor’s own shipping page (checked 2026-09-28); otherwise check with the vendor. Import duties and taxes are the buyer’s responsibility. Amazon links carry our Associates tag, so we may earn a commission; other seller links are not affiliate links today.

Used & NOS listings

Cross-model interchange (8)

Listed directly for E34 and E36 and E30 and E32 and E31 and E24 and E36/7 and E28 in our data (see Fits). Models below are other listings of the same number.

Same part numberCatalog match (partial list)bmwfans.info

Same BMW part number, but the source list is truncated or market-specific. More models may apply.

E30
318i325e325i325is325ix
E36
318i320i325i

+31 more models not listed by the source.

bmwpartsdeal vehicle fitment (lists cut off after ~10 models)

Community fixes (0)

No forum workaround recorded yet. If you know a thread, the hunt team wants to hear about it.

Kits, reman & retrofits (0)

No kit or reman service recorded yet.

DIY

No DIY route recorded yet.

Repair guides & how-tos (1)

Write-ups and videos from owners, forums and specialists on removing and fitting this part. Summaries are ours; follow the link for the full steps, photos and torque values, and credit goes to the original author.

ArticleShiftBMWDifficulty: Easywritten for E36 / E36/7 / E24

BMW Aux Fan Resistor ↗

Diagnosing a dead two-speed electric auxiliary fan. It lists the usual culprits in order (the radiator's double temperature switch, the cigar-shaped fan resistor, the low and high-speed relays, the motor, the fuse) and explains how the resistor gives low speed. Tests include measuring the switch across its pins and checking 12 V on the blue and black wires before you fit a new resistor.

Tools mentioned: Multimeter, jumper wire, screwdrivers

Written around a 318ti (M42) but says it applies to all models with an aux fan and resistor, incl. Z3.

by Dismonio · shiftbmw.com· link checked 2026-10-08

Notes & sources

Listed $86.57 on bmwpartsdeal.