Apologies if overlooked an existing dedicated thread on performing a complete coolant flush tutorial for the 2nd Gen IS vehicles.

Would like to confirm if the procedure is the same / similar for the 2006 Toyota Avalon 3.5 shown here;

 

Here you go:

https://www.clublexus.com/how-tos/a/...adiator-362361

 

Thanks Mikefig82, and apologies for overlooking the "How Tos'" Tab located at the top!!!!!!!




- First remove remover all coolant from overflow reservoir
- Loosen the radiator drain plug by turning counter-clockwise and use a 5/16" Inner dimeter hose attached to petcock to assist with draining) (Photo 1)
- Where in photo are the plugs located be removed at each cylinder bank shown (Photo 2 )?
- Use a 10 mm wrench / ratchet to loosen the engine block drain plugs shown in diagram and again us a 5/16" Inner dimeter hose attached petcock to assist with draining the fluid . IS THE TOP, BOTTOM OR BOTH ENGINE BLOCK DRAIN PLUGS NEED TO BE OPENED iSHOWN IN DIAGRAM / PHOTO 3C ?

Refill with 3 gallons of Toyota 00272-SLLC2 50/50 Pre-Diluted Super Long Life Coolant (pink)
Start vehicle and turn on the heat. Leave funnel in radiator filled with coolant in radiator opening, so engine sucks in coolant and not air.

PHOTO 1



PHOTO 2


PHOTO 3 A


PHOTO 3 B


PHOTO 3 C



YOUTUBE COOLANT VIDEO TUTORIAL;

 

Would it be recommended, using a coolant flush product (Evapo-Rust TC001 Thermocure Coolant System flush etc.), prior to filling with new coolant??

 

As long as the system only has had Toyota SLLC it should be ok. No need to flush the system. The OEM coolant has more than enough corrosion inhibitors. Now if you've been using tap water to top off for years that's a different story.

If any top off is needed, and no 50/50 SLLC in hand. You need to use deionized water only.

 

Agreed, thanks MikeFig82. Will just do a drain and fill with the Toyota 00272-SLLC2 50/50 Pre-Diluted Super Long Life Coolant (no need to use distilled water).
Would like to confirm if both Engine Block drain **** plugs (shown in diagram below), are needed to be accessed / opened to drain the block?
Aloo, does the 3.5 L 2GR-FSE V6, 2Gen IS, have the same Air Purge valve that's located on the 2GR-FE engine, used in the Camry, Avalon, RAV-4,GSX30 / GSX40 etc., as seen in second photo?


DIAGRAM



TOYOTA AND LEXUS 3.5 L 2GR-FSE V6 COOLANT AIR Purge valve (Camry, Avalon, RAV-4 etc.)
The 3.5L 2GR-FE V6 of late model Toy ota and Lexus cars and SUVs can be tricky to bleed of air after coolant replacement. Toyota installed a bleed screw on this engine specifically to help with this. Located towards the front of the engine is a small 10mm brass fitting:

 

So the location in red is for the ISX50?

I assume most cars should have a bleeder valve on thermostat housing area, or somewhere in line of the coolant lines.

 

Thanks MikeFig32. Photo uploaded is of a TOYOTA model vehicle. Would you have a photo were you believe the air bleeder valve may be located (if available at all), on the 2nd IS 2/350?


Also, would like to confirm if both Engine Block drain **** plugs (shown in diagram below), are needed to be accessed / opened to drain the block?

 

Yes those are the drain plugs. Isn't the coolant system designed for just 2 gallons?

If anything I'd pay attention to the coolant while draining. To see if any sediment is present while draining the block coming out of the drain plugs. Preferably draing the coolant in clear jugs.

Like I said the OEM coolant should have sufficient corrosion inhibitors, but you may never know. Once filling back up massage the lower and upper radiator hoses. Fill about a few quarts at a time slowly and massage.... etc.... till full enough at the cap. Probably the best is to use a Lisle funnel for the final burp. After a few fan cycles the coolant should have no bubbles present. Many videos online of this.



https://lexus-japan.epc-data.com/is2.../1105/?partno=

 

Thank you for the follow up Mike and providing the additional formation. I appreciate your time and doing so!
1- Is there a specific process for which of the two engine block drain plugs should be drained first, or it doesn't matter? Is one engine block drain plug used to drain coolant from the top and one from the bottom half of the engine block?
2 - Are engine block drain pugs both located on the same side of the block as shown in previous diagram I had uploaded (driver's side), or is one drain plug located on driver side and one located on passenger side, as it appears in the diagram you uploaded (see below)?
3 - If the 3.5 engine installed in the 2nd Gen IS equipped an air bleeder valve?





Close up of Engine block drain plug located on on GX470 (4.7-liter V8) Similar to TOYOTA Land Cruiser

 

There is no specific order to drain. Just choose whatever suits you being the car is cold.

The plugs are as follows facing engine. Driver side cylinder 2 (Bank2) a few inches down under the exhaust pipe.

Passenger side cylinder 5 (Bank 1) a few inches under exhaust manifold. Under the car you should be able to access both sides easily. Probably removing the lower engine cover.

As for a bleeder valve I don't see one on the thermostat outlet housing. Hence it's not mentioned in the drain location diagram.

If disconnecting the radiator hoses do not reuse the OEM clamps, or worm style clamps. You want some constant tension clamps. These provide a good 360 degree solid clamp seal without digging into the rubber lines.

 

Understood and thanks again Mike! I appreciate the additional information on location the engine bloc drain / air purge plugs. I recall you previous suggesting to use constant torque hose clamps in place of the OEM if removed;

Gates Constant Tension Hose Clamp 3270 Green Stripe shown (Clamping diameters – GSCT 9/16" to 3-1/2" and GSHD 1" to 9-1/8".)


Mike, completed a preliminary survey of what will be involved with performing the coolant flush. Was able to locate the Engine block drain plug on the passenger side of vehicle located just below the exhaust manifold, as you had previously stated (see photos below). Was able to access it by removing the underbody trim panel fastened in place with four 10mm screws (adjacent to the black oil pan). Confirmed that a 5/16" ID (Inner Diameter) hose can be placed over the drain valve providing a tight fit.
I was unable to locate the Engine block drain plug located on the Driver side. Mike, can the drain plug on the Driver side be accessed from above / under the hood, and removing the engine trim near the Master Cylinder reservoir?
Also confirmed that the same 5/16" ID hose can also be placed over the radiator drain petcock. Was able to access it by removing the underbody trim panel used to access the oil filter (fastened by three 10imm screws).

 

Driver side is right under the manifold cylinder 2. I would say about an inch on the lower part inline of the alternator. I'm sure if you remove the wheel you should be able to see it.

 

Thank you! Will again check near cylinder 2, in the area surrounding the alternator.

 

Believe I located the Driver side engine block coolant plug, on the following engine that was removed (referenced by yellow arrow).. Now, just need to access it!!