Thermostatic Switch

Ensure optimal engine performance with the Case Construction Thermostatic Switch #L126191. Designed for durability and precision, this essential component regulates coolant temperature, enhancing efficiency and extending the lifespan of your heavy equipment. Perfect for reliable operation in demanding conditions.

Compatible equipment

This part fits CASE CRUZ-AIR WHEELED EXCAVATOR, CASE LOGGER CRAWLER EXCAVATOR, CASE FELLER/BUNCHER CRAWLER EXCAVATOR, WHEEL LOADER TURBO, ARTICULATED WHEEL LOADER (BRAZIL), CASE WHEEL LOADER (BEFORE S/N JEE0135500), CASE WHEEL LOADER (S/N JEE0135501 & AFTER) - ENGINE SUPPLEMENT, CASE WHEEL LOADER - EUROPE (N4HE00001- / XT N4HE04001-), CASE WHEEL LOADER - EUROPE (N6HE00001- / XT N6HE04001-), CASE WHEEL LOADER - EUROPE (S/N JEE0135501 & AFTER), CASE WHEEL LOADER - NA (S/N JEE0135501 & AFTER), CASE WHEEL LOADER (EUROPE), CASE WHEEL LOADER (PRIOR TO S/N JAK0021701) (NORTH AMERICA), CASE WHEEL LOADER (S/N JAK0021701 & AFTER) (NORTH AMERICA), CASE WHEEL LOADER (NORTH AMERICA), CASE WHEEL LOADER, CASE ARTICULATED WHEEL LOADER (BRAZIL), CASE WHEEL LOADER (S/N JEE0155000 & BEFORE), CASE WHEEL LOADER (S/N JEE0155001 & AFTER), CASE CRAWLER EXCAVATOR, CASE CRAWLER EXCAVATOR (NORTH AMERICA), WHEEL LOADER (BRAZIL) including models 1085C, 1187B, 1187C, 12D TURBO BR, 521D, 621, 621B, 621C, 621D, 721, 721B, 721C, 821, 821B, 821C, 9010, 9010B, 9020, 9020B, 9030, 9030B, 9040, 9040B, 9045B, 921.

Frequently asked questions

What is the part number?

The manufacturer part number is L126191.

Is this a genuine OEM part?

Yes. Southeastern Equipment stocks OEM and quality aftermarket parts for heavy equipment. Contact us if you need a specific OEM source or aftermarket option.

Will this fit my machine?

See the compatible equipment list above. If your model is not listed, call us with your machine's serial number and we can confirm.

Where does this ship from?

Southeastern Equipment Company ships parts nationwide from our US warehouse. Orders placed before 2 PM ET typically ship same day.

Ships nationwide. In-stock parts ordered before 2:30 PM ET ship the same business day. Your exact shipping cost and delivery estimate are calculated at checkout from your ZIP code and the part’s size and weight; oversized and truck-freight items may need extra transit time and freight charges.

Free branch pickup is also available across Ohio, Indiana, Michigan, and Kentucky — just choose it at checkout.

30-day returns. New, unused parts in original packaging may be returned within 30 days. Some items — including electrical, special-order, and direct-from-supplier parts — are non-returnable. See our full return policy.