Confusing Coolant/Engine questions... - Toyota Nation Forum : Toyota Car and Truck Forums

JCamry94 · 10-02-2008, 07:40 PM

Hey guys...

I recently changed out and flushed my coolant for the first time on my own, so I'm sure I effed something up!

Anyway, I was reading and researching about doing a Throttle Body Coolant bypass.

If you don't know what that is-it is simply taking the coolant line that goes into the TB and connecting it to the one that spits coolant back out of the TB. All in an effort to cool down the throttle body a little more than stock temps.

Okay, so i'd say maybe 2-3 weeks after I did this whole thing there were absolutely NO problems, in fact the TB Bypass worked wonderfully. My CAI was cold to the touch, and the TB was significantly reduced in temp.

BUT.... it's now been around a month and TWO PROBLEMS have arisen...

#1 - My throttle body and CAI are hot ass HELL to the touch... don't know why???

#2 - My coolant overflow container continually needs refilling, but when I pop the cap it looks full. (EDIT: and by the by, nothing is leaking!)

Are these things I should be worried about??

Thanks in advance for any assistance

fakehawk · 10-02-2008, 08:40 PM

"#2 - My coolant overflow container continually needs refilling, but when I pop the cap it looks full. (EDIT: and by the by, nothing is leaking!) "

this confuses me, maybe just the wording

do you notice any smoking on start up/while driving?

how long are your trips? before the problems arose and after.

JCamry94 · 10-03-2008, 01:50 AM

Quote:

Originally Posted by fakehawk

"#2 - My coolant overflow container continually needs refilling, but when I pop the cap it looks full. (EDIT: and by the by, nothing is leaking!) "

this confuses me, maybe just the wording

do you notice any smoking on start up/while driving?

how long are your trips? before the problems arose and after.

Yes sorry it's the wording...

What I mean is my overflow tank empties out seemingly all the time, but when I pop the radiator cap, the coolant level is nice and high.

No smoking whatsoever, and my trips are exactly the same before/after the procedure... it's really confusing!

***ASG14*** · 10-03-2008, 02:00 AM

^ Sometimes simple is the answer. Check to see if the bottom of your overflow tank has a crack.

JCamry94 · 10-03-2008, 02:23 AM

Quote:

Originally Posted by ASG14

^ Sometimes simple is the answer. Check to see if the bottom of your overflow tank has a crack.

I am 99.9% positive it is not cracked, because I would've notice any kind of leakage when I check out my engine bay (since i do a lot).

But maybe it is a very tiny crack that leaks such a small amount that it evaporates through the sidewall of the engine bay out of the hood...

fakehawk · 10-03-2008, 04:22 PM

how does your oil look?

how much and how frequently do you add more coolant?

JCamry94 · 10-04-2008, 03:12 AM

Quote:

Originally Posted by fakehawk

how does your oil look?

how much and how frequently do you add more coolant?

My oil is great, I still have about 1 - 2k miles to put on it until it is changed.

I usually add about a cupfull or a little less every week or so.

***new echo owner*** · 10-04-2008, 09:40 AM

Have you check the water pump for leak? It is at the front of the engine below the alternator, look for coolant track after you had driven the car? How many miles was on the car when you flush the cooling system?

N.E.O.

Kep · 10-04-2008, 12:23 PM

I think that the plastic coolant overflow tank on 4cyl 1995s would often rub on the hood. There are two small nubs that would break open and allow coolant to escape. I had this happen on my 5SFE and went to the junk yard to get a replacement. All of the ones I found had the same problem. I wound up using some silicone to patch the two holes and I no longer have a coolant loss.

However, the high temps are suspicious. There may be two problems or there may be one.

Kep

JCamry94 · 10-04-2008, 05:05 PM

Quote:

Originally Posted by new echo owner

Have you check the water pump for leak? It is at the front of the engine below the alternator, look for coolant track after you had driven the car? How many miles was on the car when you flush the cooling system?

N.E.O.

No leaks other than a few very minimal oil leaks. I checked the whole coolant track after, and nothing is punctured, broken, or leaking.

And I just flushed it out a month and a couple weeks ago, so I'd imagine around 135,000 miles.

JCamry94 · 10-04-2008, 05:07 PM

Quote:

Originally Posted by Kep

I think that the plastic coolant overflow tank on 4cyl 1995s would often rub on the hood. There are two small nubs that would break open and allow coolant to escape. I had this happen on my 5SFE and went to the junk yard to get a replacement. All of the ones I found had the same problem. I wound up using some silicone to patch the two holes and I no longer have a coolant loss.

However, the high temps are suspicious. There may be two problems or there may be one.

Kep

Hey kep I think you are correct on this one... I checked out the back corner of the plastic and there was a very small crack. Is it possible the crack couldve lead to evaporation of the coolant?

And the high temps I have no idea how they started up.

***new echo owner*** · 10-04-2008, 06:15 PM

Where is this crack that you have found located at? The cap on the reservoir is always vented to the atmosphere.

N.E.O.

Kep · 10-04-2008, 07:33 PM

The reservoir is vented but by a "special" vent, not just a hole. When I noticed my problem there were two 3/8's" holes on the nubs, not just a crack. Don't know if a crack would have a noticable effect.

Kep

***new echo owner*** · 10-04-2008, 07:57 PM

The reason I asked where the crack is because, I have seen reservoir with cracks and holes on the top part of the reservoir without affect the operation of the cooling system, and I don't mean on or two small cracks.

If the crack he found which allows the coolant to leak out of the reservoir, then he would indeed have to keep on adding fluid.

What is the purpose of the throttle body coolant by-pass again? Where can I get information on that?

N.E.O.

JCamry94 · 10-05-2008, 03:40 AM

Quote:

Originally Posted by new echo owner

The reason I asked where the crack is because, I have seen reservoir with cracks and holes on the top part of the reservoir without affect the operation of the cooling system, and I don't mean on or two small cracks.

If the crack he found which allows the coolant to leak out of the reservoir, then he would indeed have to keep on adding fluid.

What is the purpose of the throttle body coolant by-pass again? Where can I get information on that?

N.E.O.

The crack is a small hole in the back, top of the tank.

The purpose of the TB Coolant bypass is to free up a small amount of power in cooling the TB.

The coolant acts as a 'coolant' and an 'antifreeze', with the anitfreeze being the main concern in the bypass.

What it does is bypass the TB by connectng the two the antifreeze lines (in and out) that help the TB from seizing up in freezing temps, thus cooling the TB.

For reference on the Throttle Body Bypass:

TB Coolant bypass.

What I've learned through some research on here is maybe I should look into creating my own heat sheild for the intake... Then I'll get back to you guys.

Thanks you guys for the feedback though.