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Toyota Highlander Maintenance and Repair

4692 messages,  Last post on Nov 28, 2009 at 3:26 PM

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#4474 of 4692 Coolant leak in 2001 Highlander by retropia Jan 09, 2009 (8:21 am)
In my 01 Highlander V6 AWD, I believe I've traced a coolant leak to the "front" of the engine. There is a round plastic or rubber seal, maybe two inches in diameter, held in place with two nuts attached to studs coming through the edges of the seal, from inside the engine. This is located to the left of the oil filter, just slightly higher than the oil filter. I don't know the purpose of this rubber seal nor what is behind it.   There is a slow and occasional but regular drip of coolant that appears on the floor of the garage.   Has anyone else ever encountered this, and/or does anyone know what this rubber seal is for? It's not particularly easy to get to as it is behind the exhaust manifold, and I'm thinking I'd rather take it to the dealer than attempt to fix it myself.   Thanks! Replies to this message: retropia (Jan 09, 2009 9:11 am) steve_ (Jan 09, 2009 9:53 am) electricdesign (Jan 12, 2009 7:08 am) retropia (Jan 15, 2009 2:50 pm)
#4475 of 4692 Re: Wind deflectors a solution for wind noise problem? [wwest] by steve_ HOST Jan 09, 2009 (8:59 am)
Replying to: wwest (Jan 09, 2009 8:12 am) Elvis gave his mother Gladys a pink Caddy.   Retropia, the only coolant leak post in here that I see deals with a small leak near the throttle body (link).
#4476 of 4692 Re: Coolant leak in 2001 Highlander [retropia] by retropia Jan 09, 2009 (9:11 am)
Replying to: retropia (Jan 09, 2009 8:21 am) Thanks, I think I've determined from researching at another forum that the seal in question is called an "engine block coolant passage plate" which is used as a mounting location for an optional engine block heater (not certain about that last part) and that leaks here are not uncommon.   It sounds like it might even be something I can fix myself. Replies to this message: steve_ (Jan 09, 2009 9:53 am)
#4477 of 4692 Re: Coolant leak in 2001 Highlander [retropia] by steve_ HOST Jan 09, 2009 (9:53 am)
Replying to: retropia (Jan 09, 2009 9:11 am) Interesting - my last few cars have all had block heaters but they were installed where the freeze plugs are. A plate would make it easier to install one of those gizmos.
#4479 of 4692 Replace Sparkplugs V-6 Highlander by wtacoma Jan 09, 2009 (9:31 am)
It's time to replace the plugs in our 04' Highlander. Has anyone done this? I'd like to know how involved it is. Does the intake manifold need to be removed to get at the rear bank of plugs? They look difficult to get at. Replies to this message: electricdesign (Jan 12, 2009 7:18 am)
#4480 of 4692 Re: Coolant leak in 2001 Highlander [retropia] by electricdesign Jan 12, 2009 (7:08 am)
Replying to: retropia (Jan 09, 2009 8:21 am) I found the exact same seal with a metal plate over it held by two studs and nuts, that you described, on the engine of my 04 V6 Highlander. Mine is not leaking yet, but it is good to know about it, so I can keep an eye on it. It looks like it would not be difficult to replace, it would require draining the coolant from the engine, removing the seal, installing a new seal, and refill the engine with coolant. Replies to this message: retropia (Jan 15, 2009 2:50 pm)
#4481 of 4692 Re: Replace Sparkplugs V-6 Highlander [wtacoma] by electricdesign Jan 12, 2009 (7:18 am)
Replying to: wtacoma (Jan 09, 2009 9:31 am) I am also faced with the spark plug changing job in another 7,000 miles, my 04 V6 Highlander should reach 120,000 miles this summer, which is when they are scheduled to be changed. I took a good look at it this weekend, and it appears to me that the only way to have enough room to remove and change the spark plugs is to remove the upper intake manifold. The engine is running so perfectly smooth now, that you can't even tell that the engine is running while idling at a traffic light. Being that is is so much work to change the spark plugs, I'm thinking that I won't change the spark plugs until they actually need changing.
#4482 of 4692 Re: Coolant leak in 2001 Highlander [electricdesign] by retropia Jan 15, 2009 (2:50 pm)
Replying to: electricdesign (Jan 12, 2009 7:08 am) Yes, I was able to fix it. Someone on another board posted detailed instructions on how to install the optional engine coolant heater on a Highlander Hybrid, and his photos helped me to figure out what to do.   As you suggested, I first drained coolant from a petcock located to the right of the oiil filter. I used an old section of garden hose to catch the excess coolant.   The hardest part is that the plate is located under the exhaust manifold and there isn't much space to maneuver, even with my skinny wrists. You have to work your arm in between the exhaust manifold and electric fan housing. It would have been better if I could have removed the manifold or fan housing, but I was concerned that I might mess it up putting it back together, so I just worked the best I could within the narrow space.   It was time to do an oil and filter change anyway, so I drained the oil and removed the oil filter, which did free up some space. (The coolant plate is located just to the left of the oil filter.)   Then I removed the two nuts and pried loose the metal coolant plate. It pried loose easily, because there wasn't much sealant there. It must have originally been overtightened and/or not enough sealant applied.   I cleaned the mounting surfaces with a scotch brite pad, then applied a fresh bead of Permatex high-temp silicone to the metal coolant plate, then tightened it according to instructions on the Permatex package.   So far, it is holding coolant fine and no more leaks.
#4483 of 4692 Re: ABS intermittant fault [quattrohead] by quattrohead Jan 17, 2009 (1:46 pm)
Replying to: quattrohead (Jul 31, 2008 8:51 am) Totally forgot to update this, sorry !!! Turned out to be a broken ABS sensor ring on 1 of the rear axles. The Toyota tech could not/ did not guess which one it was so they replaced both, ouch. Anyway, all fixed and back to normal. Bit of a lemon for a Toyota, 2 problems in 70Km !!!!!! Link to original post http://townhall-talk.edmunds.com/direct/view/.ef00024/4358

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