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the thermostat is place between the engine block and the radiator either in a housing on the block or in the top radiator hose , follow this u-tube link for step by step guide , nice and easy Thermostat replacement on 2002 Town and Country
the thermostat is on the rear of the cylinder head above the gear box and is connected with the upper radiator hose. Drain the radiator coolant by loosing on the low part of the radiator the plastic butterfly drain plug, and let the coolant in an empty bowl. Then by using a 12mm socket loose the bolts on the thermostat flange and remove it.When the thermostat housing removed you will see the old thermostat,pull it out and clean the old gasket Renew the thermostat and use a new gasket,put the flange back on and tight it, Fit the radiator hose and tight the jubilee clip. Then loose the 12mm bleeding bolt which is on the thermostat housing,start filling the radiator with a new coolant until the air comes out of the bleeder and close it. then start the engine and let it in idle with radiator without the cap. When temperature raised to some warm point put the radiator cap and leave it idle till fan starts.Then switch engine off and let it cool down and check the radiator coolant level and the expansion tank fill it to maximum level.
For 1999 Oldsmobile Aurora 4.0L
SFI DOHC 8cyl check thie how to replace a Thermostat:
Parts: 1. Thermostat
Tools: 1. 3/8 in. Drive Ratchet 2. Needle Nose Pliers 3. Screwdriver 4. Cooling System Pressure Tester 5. Socket Set 6. Radiator Hook Tool
Steps: Step 1 Open the hood and locate the vehicle’s radiator. o Tip: Make sure the vehicle has cooled down before inspection. o Tip: Safety Tip:Always wear safety glasses when working on your vehicle. Wear other personal protective equipment (PPE) when necessary, for example latex gloves or safety shoes.
Step 2 Remove the vehicle’s radiator cap and use a radiator pressure tester to check for leaks.
Step 3 Drain out some of the engine coolant in the radiator so the coolant level is below the thermostat housing to prevent leaking when replacing the thermostat.
Step 4 If necessary, remove the upper radiator hose. o Tip: A twisting motion may help to initially break the upper radiator hose loose. You can also use a flathead screwdriver to help pry the hose off. Make sure not to damage the hose.
Step 5 Remove the thermostat housing bolts.
Step 6 Remove the thermostat housing.
Step 7 Remove the thermostat. o Tip: Make sure to note the way the thermostat is installed. Installing the thermostat backwards will affect how the cooling system performs.
Step 8 Clean the mounting surfaces. Install the new thermostat as it was removed and always use a new thermostat gasket.
Step 9 Reinstall thermostat housing and tighten mounting bolts evenly. If applicable, reconnect the upper radiator hose.
Step 10 Refill the cooling system with coolant.
Step 11 Start the vehicle with the radiator cap off and allow the engine to run for several minutes. This allows the air bubbles to escape the cooling system.
Step 12 Reinstall the radiator cap.
Step 13 Run the engine until up to normal operating temperature. Remember to keep an eye on the temperature gauge to prevent overheating.
The thermostat is located on the left side (standing from the back of the engine) under the Alternator.
First step is to remove the neg bat cable. Try to use a mem-saver as it will save you alot of headache trying to reteach the PCM
Remove the Alternator, be careful not to break the electrical connectors. You should be able to see the thermostat housing (looks like half a ball with 2 hoses coming out of it)
Drain the coolant, and remove the housing..there are 3 bolts. Note the position of the old thermostat before removal. Install the new thermostat in exactly the same position, with the spring-end facing the engine. Clean any debris and residue from the inside of the housing cover.Put the new gasket on the thermostat and install.After everything is back as it was, re-fill the radiator start the engine and turn your heater on full. Watch for leaks.
1.Raise the front of your Mitsubishi Galant with a jack and lower onto jack stands, or use wheel ramps. Disconnect the negative cable from the battery. Drain the coolant into a suitable container by opening the drain plug on the bottom of the radiator. 2.Step 2 Follow the upper radiator hose to where it meets the engine at the thermostat housing. Loosen the clamp at the engine end of the radiator hose and pull the hose off the thermostat housing. 3.Step 3 Remove the two bolts on the thermostat housing cover and pull off the cover. Note the position of the old thermostat and remove it from the thermostat housing. Place a rag in the thermostat housing and scrape any gasket residue from the inside of the thermostat housing cover. 4.Step 4 Take out the rag and insert the new thermostat in the same position as the old one, with the spring-side facing into the engine. Install the new gasket or o-ring, depending on the type of thermostat you are installing. Note that most late 1980s and early 1990s Galant models use a thermostat gasket. 5.Step 5 Replace the thermostat housing cover and tighten the bolts. Re-attach the radiator hose and tighten the clamp. Fill the radiator with new coolant, or use the coolant drained from your Galant earlier if it's relatively new and clean. 6.Step 6 Start your Mitsubishi Galant and run with the heater on high until it reaches operating temperature. Make sure the heater is blowing warm air to ensure the thermostat is working properly. Check for leaks and tighten the radiator hose clamps if you detect any.
We changed thermostat, belts, water pump, hoses... you name it we changed it nothing worked. Just before we ordered a new radiator I took a few pics sent them to my dad and instantly he said to remove the bleeder bolt then fill radiator. That's it guys months of overheating a lot of money and hours of work when in the end it was so simple, cost nothing and took 2 mins.
Turns out most the Nissan motors have a type of bleeder bolt or something (not sure what its called exactly) on top of the motor and that should be removed while filling radiator. step 1 wait till engine is cooled down all the way. step 2 remove radiator cap. step 3 remove the bleeder bolt on top of motor (look around for it. Its just a little old bolt all alone) step 4 slowly fill radiator until coolant/water to come out of the bleeder hole. step 5 put bleeder bolt back in. step 6 put radiator cap back on. That's it. Good luck
if you do not do these steps air get caught in the system and when heated turns to steam. and your radiator cant circulate that steam because the hot air raises. The steam will just sit at the top of the motor and block the coolant/water from circulating through the radiator like it should. Without it passing through the radiator correctly it will not cool. Having a new radiator helps because when they installed it they probably filled it correctly (by removing that bleeder bolt). They knew they could have just filled the old one correctly but there isn't any $$$money$$$ in that for them.