Stant® 14839 - Heavy Duty Engine Coolant Thermostat (2024)

Vehicle Fitment

MakeModelYear
ChevyB-Series 1993-2002
Kodiak 1980-1999
T-Series 1997-1999
FordC-Series 1980-1990
FT8000 1983-1987
L-Series 1981-1989, 1997
FreightlinerCondor 2001-2003
Fl-series 1995-2003
FS65 1997-2004
M2 2003-2004
GMCB-Series 1993-2002
T-Series 1997-2002
Topkick 1980-2003
KenworthT300 1996-2003
MackMC 1983-1984
MR 1981-1985
R Series 1981-1982, 1984-1985
Peterbilt320 1997-2002
330 1995-2003
357 1998
SterlingActerra 2001-2007
Condor 2004-2006
L7501 2001
L8500 2001, 2007
L9500 1999
LT7500 1999, 2001, 2004, 2007
LT8500 1999, 2001, 2004-2007
LT9500 2001
Western Star3700 2000-2001

Product Details

Heavy Duty Engine Coolant Thermostat (14839) by Stant®. Without Check Valves and Seal. Temperature: 192F. Get fast engine warm-up and dependable engine operating temperature with a Stant thermostat. Stant’s exclusive ELAC® Thermostat Cutaway heat motor has a uniquely formulated thermally expansive wax fill that is precisely calibrated for consistent and precise thermostat valve response.

Specifications

Bypass Plate Diameter: 1.5"
Flange Diameter (Without Seal): 2.125"
Height from Flange to Bottom: 1.17"
Height from Flange to Top of Bridge: 0.82"
Temperature (F): 192 Degrees

Features

  • Quality construction ensures exact fit and prolonged service life.
  • Stainless steel bridge with channel-design for strength and rigidity.
  • Stainless steel piston for longer life and more efficient operation.
  • Brass cover and guide for heat motor piston for more efficient operation.
  • Channel constructed stainless steel spring frame for extra strength and durability.

The thermostat blocks the flow of coolant between the engine and radiator until the engine reaches a predetermined temperature, then it opens as required to allow coolant circulation and keep the engine temperature within the specified operating range. A typical thermostat has a wax filled copper housing called a “heat motor”. As the engine coolant warms, the wax melts and expands, pushing against a piston inside a rubber boot, forcing the piston outward and opening the thermostat. The thermostat begins to open within 3 or 4°F of its rated temperature and continues to open according to the engine’s cooling requirements, becoming fully open at about 15-20°F above its rated temperature. If coolant temperature begins to drop, the wax element contracts, allowing spring tension to close the thermostat and decrease coolant flow.

A thermostat can fail by sticking in the closed or open position. If the wax element becomes damaged, the thermostat can prevent the flow of coolant to the radiator and cause the engine to overheat. If the return spring breaks or debris prevents the thermostat from closing, the steady flow of coolant may overcool the engine, causing poor heater performance, increased emissions and reduced fuel economy. If you’re in need of a new thermostat, don’t settle for 2nd best, get a Stant, the world leader in thermostat engineering.

The heart of every Stant thermostat is the patented ELAC heat motor, which delivers consistent and precise response to cooling system needs. The ELAC heat motor is powered by a precisely formulated thermal responsive wax pellet in a heat conducting copper cup equipped with a stainless steel piston inside an elastomeric boot. The exact length of the piston assures the prompt and precise operation of the thermostat valve. Each heat motor is 100% calibrated to guarantee quality and performance, then it’s placed in a stainless steel valve, flange, bridge, and spring assembly.

If you’re looking for the highest flow rate of any thermostat on the market, choose the Stant SuperStat thermostat. The SuperStat uses a high flow venturi for maximum cooling capacity during high temperature, high load operations, and employs a unique Weir Valve for precise flow metering during cold, light load operation to ensure stable temperature control under all conditions. Unlike conventional thermostats that continually cycle open and closed to maintain operating temperature, the SuperStat has a unique V-notch, non-linear design that reduces cycling by precisely metering the coolant. And if you want the exact OEM design in a replacement product, Stant has what you need with the XACTstat thermostat, which is manufactured with all the features of the original equipment thermostat.

Stant® is a world leader in the development and manufacture of fuel and cooling system products. Founded in Connersville, Indiana by George Stant in 1898, today the company is still based in Connersville, but is now owned by HIG Capital LLC. Stant designs and produces a variety of consumer products including thermostats, radiator and coolant reservoir caps, original equipment style and locking fuel caps, oil fill caps, pressure testers and adapters, and fuel cap testers and adapters. Stant also offers products for heavy-duty vehicles, and farm and construction equipment, and makes parts for vehicle and equipment manufacturers. The company’s extensive background in the research and development of cooling and fuel management systems and expertise in designing steel, molded plastic, and rubber components, along with its ability to build assembly and testing equipment in-house enables Stant to move products seamlessly from concept to production. The majority of Stant consumer products are manufactured in the USA in TS16949/ISO14001 certified facilities.

Brand:

Stant

Part Number:

14839

UPC:

033342074804

Have a Question? Ask an Expert

888-903-4343

Installation

Stant® - Thermostat Instruction Sheet

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Stant® 14839 - Heavy Duty Engine Coolant Thermostat (2024)

FAQs

What are the symptoms of a bad coolant thermostat? ›

You'll need to look out for the following signs:
  • Overheating (or overcooling)
  • Coolant leaking.
  • Erratic temperature changes.
  • Strange sounds.
  • Heater problems.
Jul 2, 2024

What is the life of a coolant thermostat? ›

How long does a car radiator thermostat last? There is not a set time for the car radiator to stop working. However, most car experts recommend car thermostat replacement after 10 years.

How long do coolant thermostats last? ›

A car thermostat is designed to last a long time – typically around 100,000 miles or 10 years. However, various factors can impact its lifespan. First, driving conditions play a role. If you regularly drive in hot weather or stop-and-go traffic, your thermostat may suffer additional stress.

Do I need to replace coolant thermostat? ›

As a form of preventative maintenance, whenever you're replacing your engine cooling components like the radiator, don't forget to replace the thermostat. It is a sure way of maintaining it, as it will eventually fail.

How do I know if my temperature sensor or thermostat is bad? ›

Symptoms of bad temperature sensor
  1. Erratic Readings. Sudden jumps or drops in temperature readings. ...
  2. Open Circuit: Display shows a very high or infinite temperature. ...
  3. Short Circuit: Display shows a very low or negative temperature. ...
  4. Drift: ...
  5. Noise or Interference: ...
  6. Physical Damage:

Can you drive with a bad coolant thermostat? ›

You should replace a bad thermostat immediately and avoid driving without one until you get a replacement part.

Will a bad thermostat cause you to lose antifreeze? ›

Coolant Leaks

As the engine overheats, coolant will overflow out of the thermostat housing. This means that coolant leaking out of your engine could be a sign that your thermostat has gone bad. It can also be a sign that you have a problem with your radiator hoses, the radiator itself, or the seals and gaskets.

Can you drive without a coolant thermostat? ›

Running a car without a thermostat is not a good idea because it can lead to a variety of problems. Furthermore, if the thermostat is removed, the overall performance of the vehicle suffers: Coolant/antifreeze - The thermostat is a simple valve located between the radiator and the engine.

How do I know when my thermostat needs replacing? ›

If your thermostat is registering incorrect temperatures, then it may be time for a replacement. You can test your thermostat's reading by using a portable indoor thermometer to verify the temperature is correct. The sensor in your thermostat can malfunction from old age, misuse, or manufacturing defect.

How to tell if your thermostat or water pump is bad? ›

Next if the thermostat or the water pump is bad then the engine will over heat. Put the car back together but leave the thermostat out. If the water pump is good then it should not over heat. If you can see into the radiator with the car running then you should be seeing coolant circulating if the water pump is good.

How long does it take to replace a coolant thermostat? ›

How long does a car thermostat replacement take? An average thermostat replacement takes around 1 hour, with some taking as little as 30 minutes. More problematic replacements can take a little longer where there are issues accessing an awkwardly positioned part or if it's become seriously stuck in place.

How to tell if an engine thermostat is bad? ›

5 Signs Your Thermostat Is Broken
  1. You Notice Erratic Temperature Changes. ...
  2. You Find Incorrect Readings on the Temperature Gauge. ...
  3. Your Vehicle Makes Concerning Noises. ...
  4. You Find Coolant Leaks. ...
  5. You Notice Problems with the Heating System.

Do you have to drain engine coolant to replace thermostat? ›

Is it okay to not drain coolant before replacing a thermostat? Yep. You usually spill some, but a full drain isn't required.

Will a radiator flush fix a thermostat? ›

Nate explained that “radiator flushes help the internal engine seals, water pump and thermostat operation.”

How do I know if my thermostat is faulty? ›

7 Ways to Tell Your Thermostat Is Broken
  1. Thermostat Has No Power. ...
  2. AC or Furnace Won't Turn On. ...
  3. Heater or AC Won't Turn Off. ...
  4. Thermostat Doesn't Match Room Temperature. ...
  5. Thermostat Doesn't Respond. ...
  6. Short Cycling. ...
  7. Thermostat Forgets Programmed Settings. ...
  8. Thermostat Replacement Services.

How do I know if it's the thermostat or water pump? ›

Next if the thermostat or the water pump is bad then the engine will over heat. Put the car back together but leave the thermostat out. If the water pump is good then it should not over heat. If you can see into the radiator with the car running then you should be seeing coolant circulating if the water pump is good.

Can you drive a car with a bad thermostat? ›

If you drive with a bad thermostat, your car could overheat, causing severe and expensive engine damage. And while it's technically possible to drive without a thermostat, we don't recommend it. Your car will not reach an acceptable operating temperature, resulting in higher fuel consumption and excessive engine wear.

References

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