AE92 Coolant Drain Plug?

[91boz]

Where is the engine coolant drain plug located? I recall seeing a diagram showing it to be located under the exhaust manifold on the block but I do not see a plug there.

[89yotarollagts]

?? im not sure what your asken about but i drain my coolent from the bottom of my radiator through a lil wing nut type deal..

[91boz]

Yes, that is the radiator drain but I am looking for the engine block drain plug. Most cars have a drain plug on the engine block to drain out the rest of the coolant that doesn't come out of the radiator.

[madking411]

hey, i think its not underneath the exhaust manifold. its located next to the oil filter....but you might not notice it RIGHT away....in the haynes repairmanual, they have the oilfilter removed so you can see the engineblock drainplug better in the picture. so i guess, if you want to go through it, go ahead and drain ur oil, and remove the oilfilter if you dont notice the coolant drain...(?)

[91boz]

Thanks I'll check it out!

[freakinbox]

Yeah I came across it when I had the head off Would never notice it without the exhaust manifold out of the way, at least not from the top

[89yotarollagts]

so whats the point of doing this ? Rather than a good flush & refill ?

[Flashmn]

its for draining the coolant out of the block.

[89yotarollagts]

i understand that but wouldnt all the old crap come out of the block when you flush the system ?

[Flashmn]

yes and no, thermostat housing is higher up than the drain plug.

[91boz]

Thanks for the help guys. I just had the head rebuilt but never thought of looking for the plug when the exhaust was off.
Is it closer yo the filter or towards the center of the block?

[retiredat44]

YOu are aware some models of Toyota have an issue that when you drain coolant and fil with coolant that air pockets can develop and can result in the temperature sensors not working properly. You must make sure you don't have any air pockets in the cooling system, after doing maintanence. I know there are instructions on this somewhere, I just can't remember the Toyota models and where this info is located, and on which websites and which manuals. Maybwe somone can refresh our memories where to look for this info. I was used to the big American cars and enver heard of this till I had a foreign car. In fact I once had this happen to me. The snesors actually went wacky a few weeks after I had chaged the radiator. I believe I didn't do the procedure correctly and caused air pockets which made the snensors readings and even made the fans go crazy with the bad sensor readings...

I just thought I would bring this up, the thread looked appropriate..

[Flashmn]

Just cycle the thermostat when you change the coolant, a corolla will self-purge the air.

However, retired is right about the sensors not working when theres air... lol... lost the coolant once in my engine and drove because the temp sensor didnt move.. then suddenly BAM full hot.

[91boz]

Yes I am aware of bleeding the air out of the cooling system. My wife drives an Accura Legend and it is very critical to bleed the cooling system. Air pockets will false trigger sensors and all kinds of symptoms from idle fluctuation to no heater operation. I agree the Corolla self purges itself of air pockets. The manual shows no bleed screw that I am aware of.

[retiredat44]

Also, some cars, that are sold in certain regions of the world where it is very cold, the standard options may include block heaters, drains plugs and more, that a car in a mild climate might never have.