Question about 1990 Acura Integra

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Thermostat housing I can't seem to loosen the last bolt on the thermostat housing. Any ideas?

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I would spray WD40 or liquid wrench on the fasteners and let it sit for awhile. Then try to snug them up some more before attempting to unfasten it. Hope this helps. Good luck!

Posted on Apr 22, 2014

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By the sounds of it, it may well be seized in, make sure you have soaked it with a penetrant like fospro, leave for a few hours, then get a high impact socket that fits exactly right, give it a whack vibration helps loosen all the build up. If this doesn't work and you have a ally head, you can't really apply heat. You may end up shearing the head off the bolt then re drill and thread the hole. It does happen unfortunately and can't be helped sometimes.

Posted on Apr 22, 2014

  • Richard Smaill Apr 23, 2014

    if you have a small propane torche you can give a little heat around the casing but dont set the wires or rubber on fire just a little heat not long because it reacts if it is aluminum then put a good size socket on it and work it back and forth tighten a little and loosen a little or if you get the other bolts out you might be able to turn the housing a little to help loosen up the corrosion under the bolt and casing if all else fails take a punch and tap with hammer on the head of the bolt then just patience it should come lose



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1 Answer

How to change thermostat on a 2005 kia sedona

  1. Drain the coolant
  2. The thermostat is located at the end of the top radiator hose. Remove the drain plug from the radiator and flush the coolant into a pan.
  3. Remove the Upper radiator hose
  4. Loosen the clamps that connect the upper radiator hose to the housing and remove the hose.
  5. Remove the thermostat housing
  6. Loosen the thermostat housing mounting bolts. Remove the housing and pull the thermostat from it.
  7. Replace the thermostat
  8. Inspect the new thermostat and install it with a new gasket. Mount the housing and upper radiator hose. Then pour new coolant into the radiator.

Mar 18, 2017 | 2005 Kia Sedona

1 Answer

How to pull a thermostat and where is locateed

Assuming you have the 2.7 liter engine, the thermostat is where the lower radiator hose returns to the engine.

2.7L Engine

  1. Disconnect negative cable.
    CAUTIONDo not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.
  2. Drain cooling system.
  3. Remove radiator lower hose from thermostat housing.
  4. Remove nuts from heater tube flange studs.
  5. Loosen starter bolt at heater tube bracket.
  6. Pull heater tube out of thermostat housing and position out of the way.
  7. Remove bolt and two studs.
  8. Remove thermostat housing, O-ring and thermostat.
  9. Remove thermostat housing bolts.

To install:
  1. Clean gasket sealing surfaces.
    NOTEInstall thermostat with the bleed valve located at the 12 o'clock position, between tabs on seal.
  2. Install thermostat and seal into thermostat housing .
  3. If removed, install two studs.
  4. Install thermostat, thermostat housing and O-ring and bolt. Tighten attaching bolts to 105 inch lbs.(12 Nm).
  5. Lubricate new heater return tube O-ring with coolant.
  6. Position heater return tube flange over two studs. Install nuts.
  7. Tighten retaining nuts to 53 inch lbs.(6 Nm).
  8. Tighten starter bolt to 40 ft. lbs. (54.3 Nm).
  9. Connect the lower radiator hose to the thermostat housing. Install hose clamps.
  10. Refill cooling system.
  11. Inspect for leaks.
  12. Connect negative cable.

Mar 18, 2012 | 2001 Dodge Intrepid

1 Answer

How to get the thermostat housing to disconnect. We have taken all bolts loose but will not come apart.

Not sure if you have the 2.7L or the 3.5L so I'll post for both sizes for you:

2.7L Removal procedures
  1. Drain cooling system.
  2. Remove radiator lower hose from thermostat housing.
  3. Remove nuts from heater tube flange studs.
  4. Loosen starter bolt at heater tube bracket.
  5. Pull heater tube out of thermostat housing and position out of the way.
  6. Remove bolt and two studs.
  7. Remove thermostat housing, O-ring and thermostat.
  8. Remove thermostat housing bolts.

3.5L Removal procedures

  1. Drain cooling system.
  2. Raise vehicle on hoist.
  3. Disconnect electrical connectors from engine oil and power steering pressure switches.
  4. Disconnect radiator and heater hoses from thermostat housing.
  5. Remove thermostat housing bolts.
  6. Remove housing, thermostat, and gasket.
The OEM thermostat is staked in place at the factory. To ensure proper seating of replacement thermostat, carefully remove the bulged metal from the thermostat housing using a suitable hand held grinder. It is not necessary to restake the replacement thermostat into the thermostat housing

May 07, 2011 | 2003 Dodge Intrepid

1 Answer

Replacing the thermostat on a 2000 ford explorer 4.0

  • Place the drain pan under the drain valve on the radiator. Loosen the drain valve and allow the radiator fluid to drain. If the drain pan is clean, you can reuse the antifreeze.

  • Loosen the hose clamps on the upper radiator hose using a socket, screwdriver or pliers, depending on the type of hose clamp on the hose. Pull the hose off the radiator and thermostat housing. If the air filter intake hose is in the way, loosen the clamps and remove the intake hose (on some engines).
  • Unbolt the two bolts in the thermostat housings. Pry the thermostat housing off the engine block. Pull the thermostat out of the housing. Remove the old gasket and discard. Slide the new thermostat into the housing the same way the old one came out. Install the new O-ring seal in the housing. Coat the housing with a thin layer of silicone gasket maker. Allow the gasket maker to dry.
  • Slide the bolts into the thermostat housing, then line the bolts up to the bolt holes on the block. Slide the housing down the bolts until it touches the block. Turn the bolts in by hand to get them started. Tighten the bolts to 89 inch-pounds of torque.
  • Reinstall the upper radiator hose. Tighten the radiator drain plug. Fill the cooling system. Start the engine with the radiator cap off. Allow the engine to come up to operating temperature. Look for leaks. Watch the level of the water in the radiator. Fill as needed
  • Nov 24, 2010 | 2000 Ford Explorer

    1 Answer

    Were is my thermostat in my 1997 eagle vision

    1. Disconnect negative battery cable. CAUTION
      Do not remove the radiator pressure cap with the cooling system hot and under pressure. Serious burns from hot, pressurized coolant can result.
    2. Allow cooling system to cool completely. Place a pan under the radiator drain, located at the lower right side of the radiator. Open the valve to drain the cooling system to a level just below the thermostat. Do NOT drain the cooling system completely, unless the coolant is being changed. Close the valve.
    3. Loosen the radiator hose clamp from the upper radiator hose at the thermostat housing and if necessary disconnect the hose from the housing. Fig. 1: Loosen the radiator hose clamp from the upper radiator hose at the thermostat housing 88173p06.jpg
      Fig. 2: If necessary, separate the upper hose from the thermostat housing (it is not required) 88173p11.jpg

    4. Remove the thermostat bolts and housing. Fig. 3: Loosen the thermostat housing bolt with the proper size socket 88173p07.jpg

    5. Remove the thermostat and discard the gasket. Thoroughly clean both gasket sealing surfaces. Fig. 4: Separate the housing to access the thermostat 88173p08.jpg
      Fig. 5: Lift the thermostat out . . . 88173p09.jpg
      Fig. 6: . . . then clean the mating area 88173p10.jpg
      To install:
    6. Clean the thermostat housing bolts well. On any engine, bolts that thread into the water jacket are subject to rust and corrosion. A bolt with rust or debris in the threads can easily strip out the threads in an aluminum manifold requiring a time-consuming thread repair operation. Clean the bolts well and lightly lubricate before installation.
    7. Install the thermostat into the recess in the intake manifold. Place a new gasket, moistened with water, on the water inlet mating surface on the intake manifold.
    8. Install the thermostat housing over the gasket and thermostat and tighten the mounting bolts to 21 ft. lbs. (28 Nm) on the 3.3L engine and 105 inch lbs. (12 Nm) on the 3.5L engine.
    9. Connect the upper radiator hose to the thermostat housing and tighten the radiator hose clamp.
    10. Refill and bleed the cooling system.
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    Aug 19, 2010 | 1997 Eagle Vision

    1 Answer

    How hard is it to change alternator and thermostat on a 2007 Saturn Aura

    Those are both hardy parts that should last close to 100,000 miles, but if you need to replace them it's not real difficult, especially since there's plenty of room under the hood. The alternator is a matter of 3 or 4 bolts. Remove the plug-in wire harness from the alternator, loosen the adjuster bolt to take tension off the belt, then remove the mounting bolts and pull the alternator. Reverse the steps for the install. For the thermostat, follow the upper radiator hose to the point where it enters the engine. The hose is connected to a metal housing that's bolted to the engine. Unbolt the housing from the engine to expose the thermostat. Lift the thermostat out, remove all traces of gasket from the housing and engine, then install the new thermostat and gasket.

    Dec 29, 2009 | 2007 Saturn Aura XR Sedan

    1 Answer


    You will need a 1/2" socket with ratchet, and a 1/2" wrench for the actual removal of the thermostat housing. First, remove the air duct from the air filter housing and the air intake connection to the engine. Set aside. Next, remove the upper radiator hose from where it connects to the engine by loosening the hose clamp. At the other end of this part where the hose was removed from is the "L" shape that houses the thermostat and bolts to the engine. This part (housing) has two bolts. The top bolt will require the use of an extension on your ratchet which you will need to insert between the water bypass pipe and the exhaust heat shield before coupling with the 1/2" socket. Loosen the top bolt. The bottom bolt will require the use of the 1/2" wrench, as the socket will not fit due to the location of the heat shield. NOTE: the bottom bolt only needs to be LOOSENED and not removed, as the housing has an open "C" at the lower bolt location allowing the housing to pivot upward from that bolt. After removing the top bolt and loosening the lower bolt, you can pivot the "pipe" end of the housing downward and carefully maneuver the housing out of its location. You should now see the thermostat. Clean surfaces of the engine and housing well. Insert the new thermostat with the "spring" into the engine and the "bell" outward. Be sure the seal is seated properly into its socket in the engine. Position the housing carefully, making sure not to move the thermostat out of position. Reassembly is the reverse of removal. In my case, I did not use any gasket seal. The thermostat has a rubber seal on it which works well on its own. Adding gasket seal may make removing the housing in the future more difficult

    Jun 01, 2009 | 1999 Pontiac Grand Prix

    1 Answer

    Replacing the thermostat on a cadillac deville

    drain half of the coolant.follow top hose to the thermmostat housing .loosen hose clamp then loosen the thermostat bolts.remove the thermostat housing and thermostat.remove traces of all the old gasket from housing and the intake where thermostat goes.becareful dont scratch the surfaces while removing all the old gasket.this info is for the 4.9 for the 4.6 engines. you have to remove radiator support cover .remove the air filter housing.loosen hose clamps .remove your thermostat housing bolts then thermostat.remove traces of all old gasket.on thermostat housing and intake. then put in new thermostat in. put on housing .torque bolts 18 to 20 ft lbs.

    Apr 13, 2009 | 1995 Cadillac DeVille

    1 Answer

    Change thermostat on gm 3400 v6

    Drain coolant at the radiator drain. Remove air intake hose and MAF sensor assembly. remove throttle cable bracket and disconnect cable linkage. Remove throttle body bolts and disconnect coolant hoses to throttle body. Loosen heater hose pipe and remove heater hose from rear of pipe. Remove radiator hose from thermostat housing. Remove top thermostat housing bolt. Loosen and almost remove lower thermostat bolt. You will need to slide your wrench and hand under the exhaust crossover pipe to gain access. Loosen the bolt until you can remove the thermostat housing, it should be slotted to clear the bolt. Replace the thermostat and reassemble. Bleed cooling system using the two bleed screws (one on thermostat housing and the other on the passenger side of the engine where the heater hose pipe comes out above the water pump.

    Jan 23, 2009 | 2003 Pontiac Montana

    1 Answer


    1. Drain the coolant to a level below the thermostat housing.
    2. On some vehicles, access is easier if the front-end beauty panel and the air cleaner are removed.
    3. Remove the 2 bolts securing the thermostat housing to the intake manifold.
    4. Remove the thermostat housing.
    5. Remove the thermostat and O-ring from the housing.
    0900c15280090476.jpgThermostat installation—4.6L Engine 0900c15280090477.jpgLoosen the upper radiator hose clamp at the thermostat housing 0900c15280090478.jpgRemove the upper radiator hose clamp from the thermostat housing 0900c15280090479.jpgRemove the thermostat housing retaining bolts and . . . 0900c1528009047a.jpg. . . remove the thermostat housing from the engine 0900c1528009047b.jpgSeparate the thermostat from the housing To install:
    1. Install the thermostat and new O-ring to the housing.
    2. Install the thermostat housing to the intake manifold. Tighten the thermostat housing bolts to 18 ft. lbs. (25 Nm).
    3. Refill the cooling system using a 50/50 mixture of water and ethylene glycol antifreeze.
    4. Install the air cleaner and beauty panel, if removed.
    5. Start the engine and check for coolant leaks. Allow the engine to come to normal operating temperature. Recheck for coolant leaks.

    Nov 27, 2008 | 1992 Cadillac DeVille

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