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Do i need to drain anti freeze to change thermostat?

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You dont have to, you will lose some when taking the thermostat housing off, but not enough to warrant draining the entire system. Just stuff some rags under/around the area when removing the hose and housing. Bend hose upwards and secure it before taking the housing off. Be sure not to overtighten thermostat housing bolts as it will crack the housing.

Posted on Jun 10, 2011


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How to change a thermas stat on chev v6 3.1 monte carlo

How to change the thermostat is simple, be careful and wait a long time like over night before messing with a hot car. Now open the drain on the bottom of the radiator so you can let some of the anti-freeze out. The drain looks like a little pipe or hose and should be on the left or drivers side . It may be hard to reach but it should add to this challenge for you to make it more rewarding. Try to catch as much of the anti-freeze as possible, because you can reuse it for 1 reason and it is DEADLY POISON to animals and people. So don't drink it or let your friends or family have any either. If you can't find or loosen the drain. Then you can let the lower of the two radiator hoses loose and let some out that way. Just let about a half to a full gallon out then you can start your removal of the thermostat.
Okay find the upper hose on the radiator and follow it until it goes to the engine. There you will see where it is held on to the engine with a clamp. You will be able to loosen the clamp with a screw driver and then twisting the hose while pulling should let it come on off after some work. Push it back out of the way and you will see the thermostat housing held on by two bolts or nuts ., The thermostat is under the housing and watch which way it points altough it will only go on one way. Clean the surface of the engine and the thermostat housing real clean , scraping the old gasket off and a wire brush can get the last pieces of the old gasket off. Use silicone and you can place the thermostat and gasket either in the housing or the engine where you will notice a small machined groove where the thermostat sits, allow it to dry and it will hold the gasket in place so you can make less a mess and you can not have even a slight leak or it can cost you an engine in a few miles. Tighten the bolts even and securely. Replace the hoses if they are the least bit soft and old looking, Make sure and tighten the bottom hose or the drain and fill the plastic radiator reservoir with a mix of anti-freeze and water and let the engine run until it is warm so it will let the air trapped by the thermostat out and you will notice the fluid level drop then top it off and you should be set. Carry a bit of anti-freeze and water with you when you take her back on the road and watch your engine lights/gauge so if it even shows the slightest spike in temp. fill it with liquid and get it somewhere quick. Look to see where it is leaking and redo it right the second time. Good luck

Feb 13, 2015 | 1997 Chevrolet Monte Carlo

1 Answer

Change anti freeze

Remove under engine stone plastic shield there is a drain plug at the bottom of the radiator, remove the cap off the reservoir if the drain is blocked go ahead and remove the clamp on the bottom radiator hose and let it drain from there, if you wish to flush the system, you will need to remove the thermostat and flush it then fit a new thermostat., hope this helps. ps. be sure to use jack stands and a wheel chock.

Oct 20, 2013 | 2005 Jaguar S-Type

1 Answer

How replace the thermostat

First drain some of the anti freeze,then follow top radiator hose to thermostat housing,remove hose from housing,unloosen clamp,then remove 2 bolts on housing and pry off,then scrap both ends,remove old gasket and silicone,don't scrape to hard and scar metal.install thermostat with spring toward engine and jiggler up,use thermostat silicone on both surfaces,then install gasket and thermostat cover then tighten screws,install hose,tighten clamp,add antifreeze.check your overflow container and add if low.Usually when you install new thermostat,change anti freeze and radiator cap.

Feb 16, 2013 | 1990 Nissan Axxess

1 Answer

1993 cadi Seville running Hot

last time you change anti freeze, if over 40k miles drain flush system, replace thermostat, and new coolant, likely stuck thermostat or corrosion in cooling system. or both

Jun 08, 2012 | Cars & Trucks

1 Answer

How do i change the thermostat in my suburban

Make sure the motor is cool you can drain down some antifreeze from radiator or slowly remove top radiator hose remove the bolts holding the housing remove housing remove thermostat clean block and housing install new o-ring or gasket which ever it has install new thermostat bolts hose re-fill radiator start let warm up check for leaks and add anti-freeze if needed.

Jan 21, 2012 | 1996 Chevrolet Suburban

1 Answer

Need to flust anti freeze.Anti freeze is a thick ,gummy texture..

if the anti freeze is not serviced regularly the dexcool will start sludging up the system
if the old type (green)anti freeze was added this will also cause the same.
drain system completely & add water,run for 10 -15 minutes & this a couple times
& then add a good flshing agent with the may need to do this several times with
flushing material.after it looks better.add anti freeze & consider reflushing 1K miles or so
dont forget to bleed the system of air. bleeder valve(flat head screw) near thermostat

good luck

Jun 22, 2011 | 2004 Pontiac Grand Prix

1 Answer

I have just replaced the thermostat in my mitsubishi outlander 2006 zf 2.4l auto wagon and I am flushing the radiator but i need to know the coolant/radiator capacity and the ratio of coolant/water

Hello aislin87,

The total engine coolant capacity is 7.4 quarts.

Just changing the thermostat should not drain the entire system so you wont need that much.

The recommendation is above 30% but below 60% anti freeze to water to provide for proper freeze and anti-corrosion protection.


Feb 27, 2011 | 2006 Mitsubishi Outlander

2 Answers

Anything special i need to know when changing my anti-freeze. this is my first time, trying to save money. someone said something about getting the air out? what does that mean?

drain the coolant, connect or close all hoses and drain plugs,start motor and fill radiator with a 50/50 mix of water and anti-freeze, leave engine running,when motor gets hot the thermostat will open allowing the coolant to flow through the motor, in change the anti-freeze will get lower in the radiator thus you continue to fill untill full and the radiator will not except more coolant, ( this is how you get the air out) replace radiator cap and fill reservoir to cold level and your done. Recheck your coolant reservoir after you have driven the vehicle a bit and fill if necessary, do not fill to top, only fill to cool mark. the reservoir is not under pressure so you can fill at any time motor hot or cold

Jan 22, 2011 | 2000 Jeep Cherokee

1 Answer

Walk through on how to replace a thermostat in a 2001 Jeep grand Cherokee


1. Make sure the car is cold. Remove the radiator cap (press & turn about 1/4 turn to remove pressure in the system) Once the pressure is bled off you can remove cap and leave it rest on the filler opening.

2. Find the petcock on the radiator (the little valve attached to the radiator. You have to open/turn clockwise to drain the anti-freeze. Drain anti freeze below thermostat housing. About 1/2 to 1 gallon.

3. Have a catch basin for the anti freeze under the car. Remove upper radiator hose from radiator and thermostat housing.

4. Remove thermostat housing from engine block (usually two or three bolts in the thermostat housing). Scrap off ALL old gasket material from engine block. Double check and make sure all gasket material is removed from surface. If not the thermostat housing will leak.

5. Install new gasket with some high temp silicone. Place a couple of dabs on the thermostat housing and gasket (the silicone is used to keep the gasket in place) *MAKE SURE YOU INSTALL the thermostat the same way you took it out. Don't over tighten the thermostat housing bolts.

6. Remove the radiator cap and replace the anti freeze you removed (make sure the anti freeze is clean). Fill the radiator to the top of the filler neck and replace the radiator cap (push and turn the radiator cap to the right- like a pill bottle). Start the car and make sure the temperture guage goes up. The guage pointer should be in the middle of the guage.

7. Check the radiator reservoir for proper anti freeze level. DO NOT OPEN THE RADIATOR CAP WHEN THE CAR IS HOT!!! THE ANTI FREEZE IS HOT AND WILL BURN YOU.

Hope this helps

Apr 19, 2010 | 2001 Jeep Grand Cherokee

1 Answer

Change thermostat on 1998 toyota camry

1. Write down your radio code if it has some anti-theft device.
2. Allow the engine to cool down for about 3-hours before the start of this operation.
3. Open the hood, and disconnect the battery negative terminal. Tuck the negative terminal aside so it won't flip back.
4. Locate the radiator drain-plug (plastic wing-nut) on the lower back side of the radiator, and turn it backward to remove it.
5. Place a container under the radiator to catch the anti-freeze coolant.
6. Remove the radiator cap.
7. Once the coolant is drained, trace the upper radiator hose to where it ends on the engine(thermostat housing), and remove the hose with a medium size plier.
8. Loosen the three bolts holding the thermostat housing. Gently take out the housing.
9. Notice the position the thermostat was previously installed.
10. Replace the old thermostat, and the o-ring around it. Clean its mounting area. Notice that the o-ring fits around the thermostat.
11. Replace the thermostat housing and torque the three bolts to 78-inch pounds. Replace the upper hose.
12. Replace the radiator drain-plug.
13. Re-use the antifreeze coolant and be careful no dirt goes in with the coolant into the radiator.
14. Return the radiator cap.
15. Reconnect the negative battery terminal.
16. Start the car and check for leak.

Important: Anti-freeze coolant harmful to the environment. Return unwanted anti-freeze coolant to collection areas.

Dec 17, 2009 | 1998 Toyota Camry

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