Bublling in the thermostat housing and very hot upper radiator hose
My 2002 Ford Explorer V6 / 4.0L XLT is overheating. I have taken it to the shop 3 times. The thermostat has been replaced twice, water pump once, and thermostat housing once. Car heats up fast and then cools down. And does it all over again.
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Re: Bublling in the thermostat housing and very hot upper...
I recommend flushing the radiator thoroughly if not done recently. there seems to be some sort of blockage in the radiator at this time. if you get lots of metal fragments that are flushed out during this flush, i will then recommend a rebuild on the radiator or replacement of the radiator. make sure the cooling fans are cycling on time as well.
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Follow the upper radiator hose off the radiator to the engine, where the house mounts on the engine is where the thermostat is located, two bolts should hold it on, front top side of the engine on the intake manifold.
Drain the coolant from your Explorer into an adequate
container by opening the drain plug at the bottom of the radiator. Save
the coolant for reuse if it is relatively new and clean.
Remove the negative battery cable from the battery if your
Explorer has a 2.9-, 3.0-, 4.0- or 5.0-liter engine. This step is not
necessary for 2.3- and 2.5-liter engines.
Follow the upper radiator hose to the front driver's side of
the intake manifold, where it meets the engine. This is where the
thermostat housing on your Ford Explorer is located. If necessary,
remove the air cleaner duct for easy access to the housing.
Loosen the clip on the end of the radiator hose and pull the
hose off the thermostat housing. Use a 10mm wrench or socket to remove
the two retaining bolts on the thermostat housing cover. Remove the
Note the position of the thermostat before removal. Pull out
the old thermostat. Seat the new thermostat inside the housing in the
same position as the old one, spring-side facing into the engine.
Install new gasket over the thermostat.
Reattach the thermostat housing cover and the radiator hose.
Reinstall the air cleaner duct if removed earlier. Fill the radiator
with reserve or new coolant. Start your Explorer and run with the heater
blowing until the engine gets warm. Check for leaks.
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
You're going to lose some coolant, so have a bucket or other container, and some fresh coolant
ready. Follow the upper radiator hose
to the point where it's connected
engine. The hose is clamped to a metal housing (water inlet) which is
bolted to the
engine. Remove the bolts (not the hose) and lift the housing to expose
the thermostat (may require a little prying with a screwdriver or
similar tool). Note how the old thermostat is fitted (which end is up),
lift it out of the engine, and then remove all traces of gasket from
the housing and the engine. Install the new thermostat and gasket,
replace the bolts, add coolant as necessary, and you're done.
Before you start the job though, check the condition of your upper and lower radiator hoses. If they show any signs of wear, fraying, or fatigue, you might as well replace them too.
Follow the upper radiator hose from the radiator to the engine and there is a housing that houses the thermostat. Take it off and when you reinstall the thermostsat, make sure the spring goes toward the engine.
The thermostat is located on the motor block under the three bolt flang that the top rediator hose connects to. Remove the three 10MM bolts and the thermostat can be removed for replacement.
1. Remove the air cleaner air duct from the throttle body and air cleaner.
2. Follow the upper radiator hose to the engine to locate the thermostat housing. The housing is located at the front of the intake manifold.
3. Loosen the hose clamp, then detach the hose from the fitting. This can be difficult. If it's stuck, grasp with a pair of adjustable pliers and twist to break the seal. Then pull it off.
4. Remove the bolts and detach the housing cover. Be prepared some coolant may leak out as the gasket seal is broken. Remove the thermostat.
5. Install the new o-ring onto the thermostat (no gasket is needed) and install the thermostat into the intake manifold with the spring side pointing toward the engine.
6. Make sure the air release valve is in the up 12 o'clock position. Install housing cover and bolts. Reattach the hose fitting and tighten the hose clamp. Fill the cooling system with a 50/50 mix of coolant and water, and burp the system.
I would replace the thermostat. Sounds like it is stuck. Follow the upper radiator hose to where it hooks onto the engine. The thermostat is inside the housing that the hose hooks onto. Hope this helped and best wishes.
U should be able to locate it by following the upper radiator hose to the engine, where the hose is clamped to a housing . The thermostat is in the housing, which is usually secured w/ 2 bolts. If this doesn't help, let me know.