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Cummins Thermostat (190 Degrees) - 00-02 5.9L Cummins - 3946849

Thoroughbred Sku #: CUM3946849
Manufacturer Sku #: 3946849

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Product Details

Product Name: Thermostat - 00-02 Dodge Cummins
Manufacturer: Cummins
Manufacturer Part #: 3946849
Thoroughbred Diesel Part #: CUM3946849
Fitment Notes: Cummins Thermostat - 2000-2002 5.9L Cummins - 3946849

Thoroughbred Diesel is your source of diesel stock parts for your Dodge Diesel. We are also a real diesel repair shop that works on diesel trucks for free advice call toll free at 866-737-4966 or shop now for 2000-2002 Dodge Diesel Thermostat. At Thoroughbred Diesel we specialize in stock parts for Dodge Cummins Diesels Trucks so save big bucks by shopping for replacement stock parts at ThoroughbredDiesel.com. Thermostat Opening Temperature: 190.04° F Engine Design Phase: EEA/Echo Thermostat Type: Jiggle-Pin Vented Non-Vented: Vented Requires By-Pass Housing: No Engine Family: B Series Required Housing Bore Dia. (mm): 55.0 Stat to be capable of 245° F Operating temperature. First Used on MY03 PRE-S0 Revised Bypass Depth.


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  • Installed on 2002 Cummins. I understand this is a 190 tstat, my truck will constantly run between 180-184. I rarely see 190, only under load. Is this normal for everyone else or is mine defective?

    Wade Hendricks | 2/8/2023

    Does the thermostat open at 190 degree’s?

  • Just installed this. Original owner 2002.Has always ran at 190°, even just before I replaced with this OEM..now it shows 180°! My guage is accurate. What gives?

    Christopher A Noel | 3/27/2021

    190 degree thermostat.

  • Got05 5.9 disel won’t heat changed thermostat water pump thermal fan an sensor u can drive 25plus miles an water still below 120 degrees no heat

    Richard whiteman | 11/17/2020

    This product is for a 200-2002 dodge 5.9l. are you sure you temp gauge is accurate?

  • How do I replace the thermostat in my 1999 dodge ram 2500 diesel?

    Millie | 6/29/2020

    REMOVAL WARNING: DO NOT LOOSEN THE RADIATOR DRAINCOCK WITH THE SYSTEM HOT AND PRESSURIZED. SERIOUS BURNS FROM THE COOLANT CAN OCCUR.

     Do not waste reusable coolant. If the solution is clean, drain the coolant into a clean container for reuse.

     1. Disconnect both negative battery cables from both batteries.

     2. Remove accessory drive belt. Refer to Drive Belts, Mounts, Brackets and Accessories.

     3. Drain cooling system until coolant level is below thermostat.

        WARNING: CONSTANT TENSION HOSE CLAMPS ARE USED ON MOST COOLING SYSTEM HOSES. WHEN REMOVING OR INSTALLING, USE ONLY TOOLS DESIGNED FOR SERVICING THIS TYPE OF CLAMP, SUCH AS SPECIAL CLAMP TOOL (NUMBER 6094). SNAP-ON CLAMP TOOL (NUMBER HPC-20) MAY BE USED FOR LARGER CLAMPS. ALWAYS WEAR SAFETY GLASSES WHEN SERVICING COW STANT TENSION CLAMPS.

        CAUTION: A number or letter is stamped into the tongue of constant tension clamps. If replacement is necessary, use only an original equipment clamp with a matching number or letter.


     4. Remove radiator hose clamp and hose from thermostat housing. A special clamp tool must be used to remove the constant tension clamps.

    Thermostat Removal-5.9L Diesel

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     5. Remove the hose clamp and check valve hose at thermostat housing.

    Generator Mounting Bracket Bolts-Diesel

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     6. Remove the two upper generator bracket mounting bolts.

     7. Remove the upper generator mounting bracket.

     8. Loosen but do not remove the generator lower pivot bolt.

     9. Position the generator to gain access to thermostat housing and housing bolts.

    10. Remove thermostat housing mounting bolts.

    11. Remove the thermostat housing, thermostat, inner and outer seals and lift bracket.

    12. Clean the mating surfaces of the thermostat housing and the cylinder head.

     INSTALLATION

    Thermostat Seals-5.9L Diesel-Typical

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     1. Install the outer seal into the machined shoulder on the thermostat housing.

     2. Install the thermostat into the machined shoulder next to the outer seal. Note direction of thermostat.

     3. Position the inner thermostat seal with the shoulder towards the thermostat housing.

     4. Install thermostat, lift bracket, seals and housing to the engine as an assembly Install and tighten mounting bolts to 24 Nm (18 ft. lbs.) torque.

     5. Position generator to thermostat housing. Install and tighten mounting bolt to 24 Nm torque. Tighten pivot bolt to 43 Nm (32 ft. lbs.) torque.

     6. Install the check valve hose and hose clamp at thermostat housing.

     7. Install accessory drive belt.

     8. Connect negative battery cables to both batteries.

     9. Fill cooling system and check for leaks.

  • Will this fit a 1999 Dodge ram 2500 5.9 Cummings

    Larry Murray | 11/28/2019

    No. Here is the part number I show for your model year CUM5292742.

  • There is not very much information available here. Do I need to order a gasket also? This shouldn't be this hard.

    Jeff Ford | 10/23/2019

    No need to order gaskets.

  • Warenty on thermostat

    T.C. Foster | 9/21/2019

    1 year