Gates Engine Coolant Thermostat 33019S
Gates Engine Coolant Thermostat 33019S

Gates Engine Coolant Thermostat P/N:33019S

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$24.99
MPN: 33019S
Item Package Quantity: 1
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Gates Engine Coolant Thermostat P/N:33019S
Gates Engine Coolant Thermostat P/N:33019S
$24.99

Hold engine temperature in the sweet spot with the Gates Engine Coolant Thermostat 33019S, a direct-fit replacement for a long list of 1993-2014 Chevrolet, GMC, Isuzu, Oldsmobile and Workhorse trucks, vans and SUVs — including the 1999 Chevrolet Astro, 1999 Chevrolet Silverado 1500, 1996-2004 GMC Sonoma, 1993-2003 Isuzu NPR, 1996-1999 Oldsmobile Bravada and 2000-2004 Workhorse Custom Chassis P42. See the Buyer's Guide tab for the full 63-application list.

A coolant thermostat is the temperature-controlled valve in the cooling system, and the 33019S does that job mechanically:

  • Temperature-regulated flow: stays closed while the engine warms up, then opens as coolant reaches operating temperature so coolant can circulate to the radiator.
  • Helps stabilize running temperature: cycles open and closed to hold the engine near its designed operating temperature.
  • Supports warm-up and heater performance: restricting flow when cold helps the engine reach temperature.
  • Signs it may need replacing: overheating, running cooler than normal, gauge swings, or weak cabin heat — diagnose the cause first, as these can have other sources.

Interchange: 60909 · 2065-195 · 2065195 · 540095 · 34909 · 45119 · 59119 · 65119 · 307135720. Manufacturer part number 33019S.

This part cross-references / interchanges with the following part numbers:

60909, 2065-195, 540095, 33019S, 34909, 45119, 59119, 65119, 307135720

Frequently Asked Questions

What does the Gates 33019S thermostat do?

It regulates coolant flow: it stays closed while the engine warms up, then opens as coolant reaches operating temperature so coolant can circulate through the radiator, helping hold a stable running temperature.

Will this thermostat fit my vehicle?

It's cataloged for many 1993-2014 Chevrolet, GMC, Isuzu, Oldsmobile and Workhorse applications, such as the 1999 Chevrolet Silverado 1500 and 1993-2003 Isuzu NPR. Check the Buyer's Guide tab to confirm your exact vehicle.

What are signs my thermostat may need replacing?

Common signs include engine overheating, running cooler than normal, temperature-gauge swings, or weak cabin heat. Diagnose the cause first, since these symptoms can have other causes in the cooling system.

What part numbers does this thermostat interchange with?

It interchanges with 60909, 2065-195 (2065195), 540095, 34909, 45119, 59119, 65119 and 307135720. Its own manufacturer part number is 33019S.

Should I replace anything else with the thermostat?

Inspect the coolant and any thermostat housing gasket or seal at the same time, and consult your vehicle's service information for the correct sealing components and coolant specification.

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