Calorstat TH5699.80J Engine Coolant Thermostat
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Calorstat

Calorstat TH5699.80J Engine Coolant Thermostat

Brand Calorstat TH5699.80J
Sealing Flange Outside Diameter 2.62
Height Between Flanges 1.2
Type Standard
Gasket Or Seal Included Yes
Jiggle Pin Weep Hole Yes
Seal Type Gasket
Start to Open Temperature 176.0
Seal Material Rubber
9813 1.65
9841 1
9844 1
9852 1
9943 Yes
By-Pass Valve Diameter 42.0
Height Shoulder 8.1
Height, By-Pass Side 30.5
Valve-Seat Diameter 66.6
With Locating lug
Fits Mercedes-Benz · 14 vehicles

Standard thermostat. Includes a gasket seal for straightforward replacement.

Jiggle pin weep hole. Helps vent trapped air for more consistent coolant flow.

Locating lug. Helps align the thermostat during installation.

Cross-references Anchor 10264, Motorad 251-180 and 2.109.80 for the same application. See all 29.

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Engine Coolant Thermostat for Mercedes-Benz

Calorstat TH5699.80J is a standard engine coolant thermostat built for precise coolant flow control in select Mercedes-Benz diesel applications. It includes a gasket and seal, plus a jiggle pin weep hole for easier air bleeding during service.

  • Standard engine coolant thermostat
  • Start to open temperature: 176.0°F
  • Gasket or seal included: Yes
  • Seal type: Gasket with rubber seal material
  • Jiggle pin weep hole: Yes
  • Locating lug for correct positioning
  • By-pass valve diameter: 42.0
  • Valve-seat diameter: 66.6
  • Sealing flange outside diameter: 2.62
  • Height between flanges: 1.2

Fitment Details

Compatible with Mercedes-Benz diesel models listed below. Fits 1998-1999 Mercedes-Benz E300, N/A. Fits 1994-1995 Mercedes-Benz S350, N/A. Fits 1990-1993 Mercedes-Benz 300D, N/A. Fits 1992-1993 Mercedes-Benz 300SD, N/A.

This part cross-references Motorad 251-180 for the same application.

How This Thermostat Works

TH5699.80J regulates coolant temperature by opening at 176°F, helping the engine reach and maintain operating temperature. That temperature control supports stable warm-up, consistent heater performance, and proper cooling-system circulation in Mercedes-Benz E300, S350, 300D, and 300SD diesel platforms. The locating lug helps align the thermostat during installation, while the jiggle pin weep hole assists with trapped-air release.

Common Reasons to Replace

  • Engine runs too cool or takes too long to warm up
  • Temperature gauge fluctuates during driving
  • Coolant flow is restricted by a sticking thermostat
  • Heater output is inconsistent after coolant service
  • Cooling-system service reveals a worn gasket or seal

Installation Notes

Verify housing condition and clean the sealing surfaces before installation. Use the included gasket/seal and align the locating lug correctly so the thermostat seats fully. After installation, refill and bleed the cooling system according to the vehicle service procedure to remove trapped air.

Quality Assurance

Calorstat TH5699.80J is an OE-style thermostat for the listed Mercedes-Benz applications. Vernet is an OE supplier to Mercedes, and this part is built to match the specified temperature and dimensional requirements for service replacement.

Related reading

This part fits 14 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersNotes
1999Mercedes-BenzE3003.0LL6Vernet is an OE Supplier to Mercedes
1998Mercedes-BenzE3003.0LL6Vernet is an OE Supplier to Mercedes
1995Mercedes-BenzS3503.4LL6Vernet is an OE Supplier to Mercedes
1994Mercedes-BenzS3503.4LL6Vernet is an OE Supplier to Mercedes
1993Mercedes-Benz300D2.5LL5Vernet is an OE Supplier to Mercedes
1993Mercedes-Benz300SD3.4LL6Vernet is an OE Supplier to Mercedes
1992Mercedes-Benz300D2.5LL5Vernet is an OE Supplier to Mercedes
1992Mercedes-Benz300SD3.4LL6Vernet is an OE Supplier to Mercedes
1991Mercedes-Benz300D2.5LL5Vernet is an OE Supplier to Mercedes
1990Mercedes-Benz300D2.5LL5Vernet is an OE Supplier to Mercedes
1989Mercedes-Benz190D2.5LL5Vernet is an OE Supplier to Mercedes
1988Mercedes-Benz190D2.5LL5Vernet is an OE Supplier to Mercedes
1987Mercedes-Benz190D2.5LL5Vernet is an OE Supplier to Mercedes
1986Mercedes-Benz190D2.5LL5Vernet is an OE Supplier to Mercedes
Directly replaces or cross-references 29 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Anchor — 10264Motorad — 251-1802.109.802.136.80.319281.804118.804176.804176.80D0969881996900420309756012000115602200001560320000156052030075606203017560620304756062090175A0042030975A6012000115A6022000015A6032000015A6052030075A6062030175A6062090175TH12680TH12680G1TX 29 80DVT281.80