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I have this same question. I want to know when Toyota first started using their own Toyota Red coolant in their vehicles. The first time I start seeing Toyota Red coolant mentioned in Toyota service literature is in the early to mid 1990s.
For reference, my 1987 Factory Repair Manual only states "Use a good brand of ethylene-glycol base coolant, mixed according to the manufacturers instruction."
My Owner's Manual gives the most information about coolant type under Winter Driving Tips:
"Make sure you have ethylene-glycol coolant in the radiator.
This is the type of coolant your new Toyota is delivered with and the type your dealer will always use. In addition to preventing corrosion and lubricating the water pump, this coolant will prevent freezing and subsequent damage to the engine block."
The above description is pretty vague and does not say anything about the coolant needing to be of the non-silicate type such as Toyota Red.
So far, I cannot pin down when Toyota officially started using Toyota Red.
I am currently using Prestone's universal green coolant as that is what was in it when I got the truck. Just note that if you are switching coolant types, it is essential to flush out all of the old coolant. Different coolant types usually do not mix well.
I hear Toyota Red might be phased out in the not too distant future as Toyota has been using the Toyota Pink Super Long Life coolant for new cars for a while now.
THe mixing of collant types is the key information. I'll see if I can get any information.
I am willing to adjust my thoughts. I did learn that red is proper, and I do have the experience of "various" antifreeze types over the 3 head gasket jobs before I put a new engine in it. MAkes sense to me. I'll take a pic of the coolant passages at a later time and post it.
I think the Red vs green debate will haunt us for a while.
Anyway, did you find out where the leak is coming from? That is definitely not an easy spot to look at and there are many places in that area that coolant can come from.
Easiest way to work up under the intake is to move the air conditioner out of the way.
Three hoses up under the intake. Two for the idle air control valve, and the coolant bypass hose. The coolant bypass hose is U-shaped. Then there is the o-ring that has already been mentioned.
Easiest way to work up under the intake is to move the air conditioner out of the way.
Three hoses up under the intake. Two for the idle air control valve, and the coolant bypass hose. The coolant bypass hose is U-shaped. Then there is the o-ring that has already been mentioned.
i agree, pull the a/c compressor off of its mounting and lay it over on the frame next to the inner fender. i need to do this, as i just had the no.1 bypass hose fail yesterday, and i can see the coolant weeping from the split in the hose. ordered the no.1 bypass pipe, just because i'll be in there (and ordered the other cooling system hoses/clamps/etc). looks like fun to replace all of the hoses, too.
Sorry for my late update and thank you very much for your help guys.
We left the 4R behind because of the leak, we took our DD for the last trip.
I wanted to update this trhead in case other member's dealing with the same problem.
After a couple of weeks, the leak's more visible, see the first photo attached, it comes from the 2 bolts inside the yellow circles, they hold the heater metal pipe under the intake manifold.
Apparently I have to replace the o-ring, see the second photo attached, 22RE Performace sells those.
I'll update this thread if that solves the problem.
Last time I had my 22RE apart, the o-ring just fell apart. I had to clean the nipple that the o-ring slides over with some fine emery cloth. I also used fine emery cloth on the flange(intake side). If you can get a caliper around the nipple to measure, NAPA sells o-rings cheap.
Hi guys!
I wanted to update this thread in case other member is dealing with the same issue.
I replaced those bolts and the o-ring. You can see in the last pic attached what the problem was (old one in the left, replacement in the right).
Thank you very much for your help!
12-03-2018, 11:23 PM
