Engine coolant drain plug.

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Topic author
Khoc
Posts: 17
Joined: 04/04/21 14:24

Engine coolant drain plug.

Post by Khoc »

Hi guys, I am wanting to complete a coolant change by draining the radiator plug and the engine drain bolt as car has sat for 10 years. I believe I have located the engine drain bolt and can't get the bugger open! Have sprayed with WD40 and going to wait a couple of days before I jack up car and try again! Any tips?
:th:
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supercookie
Posts: 94
Joined: 02/03/14 11:14

Re: Engine coolant drain plug.

Post by supercookie »

Maybe get the engine warm & just try loosening it (don't remove completely cos of hot coolant)

Topic author
Khoc
Posts: 17
Joined: 04/04/21 14:24

Re: Engine coolant drain plug.

Post by Khoc »

;)
Also going to jack front and back up and place axle stands as think I might get better access to it. Took me over an hour to find it as it's really out of the way!

rgb
Posts: 72
Joined: 08/05/10 13:58
Years of MR2 Ownership: 11
MR2's Owned: 4

Re: Engine coolant drain plug.

Post by rgb »

there are two drain bolts on the metal pipes that go to the radiator . pull off the rear undertray and you will see them
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MR2DI4
Posts: 1354
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Real Name: Carl
Location: Tauranga >>> New Zealand

Re: Engine coolant drain plug.

Post by MR2DI4 »

Did the engine have proper coolant in it ? Personally I wouldn't bother trying to get that bolt out, just flush the whole system with water a couple of times and refill with new coolant if the existing coolant looks bad.

Really depends on what the existing coolant looks like, if its really clean then leave it alone. Not changed mine for over 10 years.

So many cars end up running plain water and for an MR2 with so much cast iron its a nightmare. The whole cooling system is pretty much stuffed if that has happened because a layer of rust plaque just forms over everything, even the inside of the rubber hoses.

Topic author
Khoc
Posts: 17
Joined: 04/04/21 14:24

Re: Engine coolant drain plug.

Post by Khoc »

Well yesterday...
drained old brown coolant, about 4 liters via the radiator (had bleed hoses on and open) put hose pipe down cap at back to flush. Tried to refill with coolant and would only take 4 liters. Repeated the whole process again and same happened so think engine plug drain would get all the bad coolant out.

Topic author
Khoc
Posts: 17
Joined: 04/04/21 14:24

Re: Engine coolant drain plug.

Post by Khoc »

rgb wrote: ↑11/04/21 18:34 there are two drain bolts on the metal pipes that go to the radiator . pull off the rear undertray and you will see them
Would this drain the coolant from the engine?

Topic author
Khoc
Posts: 17
Joined: 04/04/21 14:24

Re: Engine coolant drain plug.

Post by Khoc »

Coolant drained via the engine drain bolt. Following all the steps to bleed system but is taking a while to get Coolant in. So far 7 liters in 2 days. Have a feeling it won't be taking 14 liters. Is it possible that because it's a Japanese import the Coolant amount is different?
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