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Radiator problem-where is the thermostat? is there a lower housing unit containing the thermostat?!

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radiator problem-where is the thermostat? is there - 91c310d.jpg

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Posted on Nov 13, 2009

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Normally the thermostat is located at the point where the upper radiator hose connects to the engine. On some vehicles it may be on the lower hose connection.

Posted on Nov 13, 2009


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Why does a coolant container with a loose hose that appears to have been welded off on one end, require that the thermostat housing unit be replaced.

I would get a second opinion. I don't know your car, but in most cars, the coolant tank connects to the radiator, right under the radiator cap. I don't see what that has to do with the thermostat housing either.

Aug 14, 2014 | 2002 Volvo S80

1 Answer

Want to know whats these codes mean [Engine rpn 704 rpm],[Map sensor 45 kpr], [cool ant temp 141f], [Dtc t caused rreezerrame p1281]. for a 2000 grand cherokee

Hi, the first part is data taken along with the code. The code P1281 indicates the engine is running cold (141 degrees--should be at least 190). Is your temp gage running lower than you are used to? If yes, it may be your thermostat has failed open. I have pasted below instructions for replacing the thermostat. Please let me know if you have any questions, and thanks for using FixYa.

3.7L & 4.7L Engines WARNING Do not loosen radiator drain **** with system hot and pressurized. Serious burns from coolant can occur.

NOTE Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse. If thermostat is being replaced, be sure that replacement is specified thermostat for vehicle model and engine type.

  1. Disconnect negative battery cable at battery.
  2. Drain cooling system.
  3. Raise vehicle on hoist.
  4. Remove splash shield.
  5. Remove lower radiator hose clamp and lower radiator hose at thermostat housing.
  6. Remove thermostat housing mounting bolts, thermostat housing and thermostat.

To install:
  1. Clean mating areas of timing chain cover and thermostat housing.
  2. Install thermostat (spring side down) into recessed machined groove on timing chain cover.
  3. Position thermostat housing on timing chain cover.
  4. Install two housing-to-timing chain cover bolts. Tighten bolts to 115 inch lbs. (13 Nm).
    CAUTION Housing must be tightened evenly and thermostat must be centered into recessed groove in timing chain cover. If not, it may result in a cracked housing, damaged timing chain cover threads or coolant leaks.
  5. Install lower radiator hose on thermostat housing.
  6. Install splash shield.
  7. Lower vehicle.
  8. Fill cooling system.
  9. Connect negative battery cable to battery.
  10. Start and warm the engine. Check for leaks.

Removal & Installation, 4.0 liter engine

  1. Disconnect the negative battery cable.
  2. If necessary, disconnect the coolant temperature sensor electrical connector.
  3. Disconnect the upper radiator hose from the thermostat housing.
  4. Remove the attaching bolts and lift the housing from the engine.
Remove the thermostat and gasket.
To install:
  1. Clean all gasket surfaces thoroughly.
  2. Place the thermostat in the housing with the spring inside the engine.
  3. Install a new gasket with a small amount of sealing compound applied to both sides.
  4. Install the water outlet and tighten the mounting bolts to 200 inch lbs. (23 Nm) on V-8 engines and 15 ft. lbs. (20 Nm) on non-8 cylinder engines.
  5. Install the upper radiator hose to the housing and tighten the hose clamp.
  6. Connect the coolant temperature sensor connector to the housing.
  7. Refill the cooling system.

Apr 13, 2011 | 2000 Jeep Grand Cherokee

1 Answer

Where is the thermostat on a 1995 1.8 liter toyota carroolla

The thermostat is located in the housing that the lower radiator hose goes on to, if you follow the lower hose from the radiator to the engine , remove the hose from engine by removing the clamp and sliding hose off. You will need a container to catch the coolant that will run out when the hose is removed, to do this a little neater, locate the drian valve on the bottom of the radiator and just turn to loosen valve and drain coolant there first, make sure to remove the rad cap to drian cooling system better. also keep container under the hose you remove to catch the small amount of coolant that will flow out and once the thermostat is removed coolant will run out from engine. with the hose off you will see 2nuts to move and then housing comes off and theres the thermostat. Hope this is helpful.

Mar 13, 2011 | Toyota Corolla Cars & Trucks

1 Answer

How do you change thermostat in 03 cobra where is the thermostat

4.6L Engine - replacing thermostat

CAUTION Never remove the radiator cap under any conditions while the engine is running, or while hot. Failure to heed this caution could result in cooling system damage or severe personal injury.
  1. Drain the engine cooling system until the coolant level is below the thermostat.
  2. Detach the lower radiator hose, the return hose and the degas bottle hose from the thermostat housing.
  3. Remove the two mounting bolts, then remove the thermostat housing.
  4. Remove the O-ring and thermostat from the housing. Discard the O-ring.

  5. archaeology_16.jpg
Figure - exploded view of thermostat and Housing - 4.6L engine

To install:

NOTE To prevent installing the thermostat with an incorrect orientation, the housing contains a positioning slot. Install the thermostat so that the bridge part protrudes into the housing, not into the intake manifold.
  1. Position the thermostat and a new O-ring on the housing, then install the housing.
  2. Install the two mounting bolts, and alternately tighten them to:
    1. 4.6L SOHC engines 15-22 ft. lbs. (20-30 Nm).
    2. 4.6L DOHC engines 89 inch lbs. (10 Nm).

  3. Connect the lower radiator hose, the return hose and the degas bottle hose to the housing.
  4. Fill the cooling system, then start the engine and check for leaks.
  5. If necessary, top off the cooling system overflow reservoir.

  1. Drain the engine cooling system.
  2. Remove the air cleaner outlet pipe.
  3. Remove the 2 thermostat housing bolts and separate the lower and upper thermostat housings.
    1. Discard the thermostat O-ring seal and remove the thermostat.

To install:

NOTE Lubricate the O-ring seal with clean engine coolant.
  1. Install a new thermostat with the smaller plate facing upward and the O-ring seal.
  2. Position the lower and upper thermostat housings together and install the 2 bolts. Tighten to 89 inch lbs. (10 Nm).
  3. Install the air cleaner outlet pipe.
  4. Fill and bleed the cooling system.

Feb 20, 2011 | 2003 Ford Mustang

2 Answers

How do I install a thermostat on a 1999 jeep grand cherokee v8 4.7 engine


To install a thermostat on Your 1999 grand cherokee jeep. You will be needing these instruments, Container, Clamp tool or vise-grip pliers, Thermostat and gasket, 10mm socket or wrench, Razor blade, Flathead screwdriver (if necessary). Then You carefully follow the steps below:
  1. Open drain **** on the radiator to drain the coolant from your Jeep Grand Cherokee. This drain **** is located on the lower right side facing the rear of your Cherokee. Use a seal able container and reuse the coolant if it is relatively new and clean.
  2. Follow the upper radiator hose to the point where it meets the thermostat housing. The thermostat is located inside the housing. Use a clamp tool or vise-grip pliers to loosen the clamp holding the hose to the housing. Work the end of the radiator hose free of the thermostat housing.
  3. Remove two bolts holding on the thermostat housing cover. Pull off the cover. Take note of the position of the old thermostat. Remove and install the new thermostat in exactly the same position.
  4. Scrape off residue of the old thermostat gasket from the inside of the thermostat housing cover using a razor blade. Avoid getting any debris inside the thermostat housing.
  5. Install the new gasket. Reattach the thermostat housing cover and radiator hose. Start your Jeep Cherokee and run the heater on high. Allow the engine to warm up. Check for leaks.
Those are the steps to follow to install your thermostat.
Hope this was helpful. Thank You for using fixya!!!

Jan 12, 2011 | 1999 Jeep Grand Cherokee

2 Answers

Location of thermostat

Instructions Things You'll Need:
  • Container
  • Jack and jack stands or wheel ramps (if needed)
  • Screwdriver
  • 13mm socket or wrench
  • Thermostat and gasket
  1. 1

    Turn the drain valve at the bottom of the radiator counterclockwise to drain the coolant from your Ford Taurus into a suitable container. Depending on the size of the container, it may be necessary to lift the front end of your Taurus with a jack and lower it onto jack stands, or use wheel ramps.

  2. 2

    Follow the upper radiator hose to the point where it meets the thermostat housing at the front of the intake manifold. Loosen the hose clamp and pull the radiator hose off the water connection on the thermostat housing.

  3. 3

    Take out the two bolts on the thermostat housing cover with a 13mm socket or wrench and remove the cover. Clean any old gasket residue from the inside of the thermostat housing cover. Pull out the old thermostat.

  4. 4

    Insert the new thermostat into the thermostat housing with the spring-side facing into the engine. Install the new thermostat gasket. Use a spray adhesive to hold the gasket in place, if desired.

  5. 5

    Reinstall the thermostat housing cover. Tighten the bolts to 89-124 in. lbs. Reattach the upper radiator hose to the thermostat housing. Make sure the drain valve on the radiator is closed.

  6. 6

    Fill the radiator with new or reserve coolant. Start your Ford Taurus and allow it to warm up to its normal operating temperature. Check hoses and connections for leaks and tighten hose clamps to stop any leaks, if necessary. Add more coolant as needed.

Oct 23, 2010 | 1999 Ford Taurus

1 Answer

Where is the thermostat located in a 98 jetta

There is a housing at the end of the bottom radiator hose opposite the radiator. To access this, you must remove the power steering pump and its bracket. Then the housing, attached to the lower radiator hose is bolted to the lower part of the front of the engine, contains the thermostat. It is a 195 degree from the factory. A Duralast (pn 15379)that has a built-in bleeder, is a good one to pick up for about $15 at most parts houses.

May 05, 2010 | 1998 Volkswagen Jetta

2 Answers

Where is the thermostat located

thermostat is located at the end of the lower radiator hose, not the upper like most vehicles. Remove the two bolts (most likely 10mm, you'll need a deep socket 10mm) then the housing. The thermostat is in the housing. remove and replace with a new one.

Dec 07, 2009 | 2006 Chevrolet Impala

1 Answer

My heat will suddenly go cold, then after a while it will work again. i think it may be the thermostat, but i'm not sure. I have all the tools to do a thermostat change, I just don't know where it is on...

Removal & Installation CAUTION When draining coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze, and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Raise and support the vehicle safely on jackstands.
  2. From the driver's side portion of the radiator, open the draincock and drain the radiator so the coolant level is below the coolant outlet elbow which houses the thermostat. If the radiator has been replaced, the replacement unit may not have a draincock. In this case the lower radiator hose will have to be loosened and removed to allow for the coolant to drain out.
On some models it may be necessary to remove the distributor in order to gain access to the thermostat housing mounting bolts.
  1. Remove the outlet elbow retaining bolts and position the elbow clear of the intake manifold or cylinder head to provide access to the thermostat.
5eb8a98.jpg Loosen and remove the bolts and/or stud which secure the thermostat housing to the engine

Installation is in reverse order....

The housing that "holds" your thermostat is right below the distributor.

Oct 31, 2009 | 1987 Mercury Grand Marquis

4 Answers

Where is the thermostat?

Follow the lower radiator hose to the motor the housing should be at the end of hose, drain coolant disconect hose and unscrew bolts hold thermostat housing then tap with rubber mallet or pry with a screw driver to remove the housing

Sep 18, 2009 | 1998 Buick Skylark

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