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Old 04-29-2012, 09:23 PM   #1
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coolant bypass

I just did the coolant bypass so no coolant goes through my throttlebody. I have a part number for a hose at autozone that works perfect for this bypass. D87658 If you cut just over an inch off the 90 degree bend end it will have a bend that will go behind the serpbelt tensioner I cut about 3 inches off the other end. this is alot better than using a straight piece of hose that doesnt look that good. It took me 10 minutes to do the bypass. I hope this helps
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Old 04-29-2012, 09:59 PM   #2
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Re: coolant bypass

post a pic?
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Old 04-29-2012, 10:04 PM   #3
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Re: coolant bypass

I will try tomarrow I cant ever get pics from my camera on this site all the pics i have are from other peoples cameras
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Old 05-23-2012, 06:54 PM   #4
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Re: coolant bypass

I too just completed this mod and with that hose it was a breeze. Trimmed off about 1 inch at the manifold and about 3 going to the diverter valve. Put on a couple hose clamps and I'm ready to go. I used the factory clamp at the diverter valve but used a regular clamp at the manifold. The air intake covers it up though. Thanks for the lead on the hose.
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Old 05-27-2012, 07:11 PM   #5
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Re: coolant bypass

Quote:
Originally Posted by Damon23 View Post
I too just completed this mod and with that hose it was a breeze. Trimmed off about 1 inch at the manifold and about 3 going to the diverter valve. Put on a couple hose clamps and I'm ready to go. I used the factory clamp at the diverter valve but used a regular clamp at the manifold. The air intake covers it up though. Thanks for the lead on the hose.
Its like they made that hose so we can do this. I like that it looks factory and bent to go around the tensioner.
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Old 05-27-2012, 07:21 PM   #6
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Re: coolant bypass

So what is the real purpose of this mod?
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Old 05-27-2012, 11:24 PM   #7
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Re: coolant bypass

Performance gains by not running hot antifreeze through the TB are negligible. But it still seems to me that keeping the TB as cool as possible just makes sense. No negative tradeoff here, unless you are driving to Alaska for Christmas, in which case you may suffer icing. And once you do the bypass, it makes future removal of the TB or plenum much less messy.
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Old 05-27-2012, 11:24 PM   #8
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Re: coolant bypass

Avoids unnecessary heating of the Throttle Body, potentially cooling the air for a couple of HP.

If you live somewhere very cold, the heated Throttle Body would be required, otherwise it will just heat the intake air.

Also simplifies the cooling system a little bit. less stuff to fail or be replaced.
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Old 05-28-2012, 04:43 PM   #9
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Re: coolant bypass

It looks cleaner when you remove the inlet and outlet, easier to remove throttlebody, throttlebody doesnt get as hot. If you live it the north where it gets really cold ice may form and the coolant going through it will melt it faster.
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Old 05-29-2012, 08:24 PM   #10
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Re: coolant bypass

FYI heating the throttle body helps prevent carbon build up in the TB. That's why I havn't done this mod.
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Old 05-29-2012, 08:34 PM   #11
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Re: coolant bypass

I don't understand, how would you get carbon in the TB and why would a higher temperature clear it?
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Old 05-29-2012, 10:38 PM   #12
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Re: coolant bypass

I did the mod and although im not gonna say it made a huge difference, i did notice a slightly better throttle response, especially when at operating temp.

It also gets you slightly better mpg's because of the colder air intake temp.

Definetly would recommend if you live somewhere warm (im in NC), and it only costs +/- $5 and abt 20min of your time.
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Old 05-30-2012, 04:23 PM   #13
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Re: coolant bypass

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FYI heating the throttle body helps prevent carbon build up in the TB. That's why I havn't done this mod.
I dissagree with you. for the 2 1/2 years I have owned my car I have had to clean my throttlebody every 6 months because I would get a buildup to the point that my car will not run when cold and died when it was warmed up from low idle. I remove the throttlebody clean it really well put it back on instantly my car will run perfect again. I just did the bypass so up till a couple weeks ago I have had the coolant going through the throttlebody. I will post in 6 months to let everyone know the long term affect of doing this mod.
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Old 05-30-2012, 06:24 PM   #14
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Re: coolant bypass

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I don't understand, how would you get carbon in the TB and why would a higher temperature clear it?
It doesn't clear it. What it does is evaporate the condensation that occurs behind the throttle plate (both on the plate and in the ports). It's this condensation that carbon deposites stick to. So, by minimizing the condensation, it minimizes both carbon build up and icing.
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Old 05-30-2012, 06:49 PM   #15
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Re: coolant bypass

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I dissagree with you. for the 2 1/2 years I have owned my car I have had to clean my throttlebody every 6 months because I would get a buildup to the point that my car will not run when cold and died when it was warmed up from low idle. I remove the throttlebody clean it really well put it back on instantly my car will run perfect again. I just did the bypass so up till a couple weeks ago I have had the coolant going through the throttlebody. I will post in 6 months to let everyone know the long term affect of doing this mod.
It's not my opinion. That is actually information right out of an ASE text book. If you need to clean you TB that frequent there may be excessive blowby or other issues (or you drive A LOT).
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Old 05-30-2012, 06:53 PM   #16
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Re: coolant bypass

Where does the carbon come from, all you should have there is clean filtered air.
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Old 05-30-2012, 07:00 PM   #17
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Re: coolant bypass

EGR
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Old 05-30-2012, 07:01 PM   #18
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Re: coolant bypass

Quote:
Originally Posted by eseibel67 View Post
EGR
And PCV.
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Old 05-30-2012, 07:35 PM   #19
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Re: coolant bypass

Quote:
Originally Posted by lb9 GTA View Post
It's not my opinion. That is actually information right out of an ASE text book. If you need to clean you TB that frequent there may be excessive blowby or other issues (or you drive A LOT).
I dont know what you would consider driving alot in the 2 1/2 years I have owned it I have put just over 40k miles on it ( I love driving my car) lol. I know the engine is original probably has blowby due to having over 180k.
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Old 06-07-2012, 12:24 PM   #20
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pics!

Here are some pics I took while doing this mod (and replacing my thermostat). Please see this thread for more info on that: http://www.thirdgen.org/techboard/tp...at-1988-a.html

Laying the hose in there, I didn't see how it was supposed to be such a good fit?
12 - IMG_3913.JPG
But cutting an inch off the elbow end and a few inches off the other end like they said....
13 - IMG_3918.JPG
And it does fit pretty good!
14 - IMG_3919.JPG
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Old 06-08-2012, 06:11 PM   #21
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Re: coolant bypass

Thank you for adding the pics. the tgo wont let my pics from my camera go up on here. That is exactly the way I did it. That hose fits near perfectly.
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Old 10-16-2012, 03:45 PM   #22
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Re: coolant bypass

Quick Question for y'all. I live in Central Indiana and will be driving to Massachusetts for Christmas. Would the bypass be a bad idea?
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Old 10-16-2012, 04:13 PM   #23
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Re: coolant bypass

I'm originally from Indiana and I visit there annually. I'm here to tell you that I know it's friggin cold up there. I'd leave it connected during the winter since you'll be doing highway driving. You could have icing problems without the added heat if it were say cold (<40F) and raining.

Mine is still stock, but I'm considering changing it now that I've seen this hose. Looks like a factory fit with the bends. Thanks for reviving the thread.
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Last edited by afremont; 10-16-2012 at 04:20 PM.
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Old 10-16-2012, 04:16 PM   #24
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Re: coolant bypass

Quote:
Originally Posted by afremont View Post
I'm originally from Indiana and I visit there annually. I'm here to tell you that it's friggin cold up there. I'd leave it connected during the winter since you'll be doing highway driving. You could have icing problems without the added heat if it were say cold (<40F) and raining.

Mine is still stock, but I'm considering changing it now that I've seen this hose. Looks like a factory fit with the bends. Thanks for reviving the thread.
Thanks for the suggestion. I'll do just that. Probably disconnect it next summer and then back in the winter. It'll make it easier to work on during the hot season and maybe keep my under-hood temp down a couple degrees?
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Old 10-23-2012, 10:56 PM   #25
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Re: coolant bypass

if you want to get creative and completely relocate the hot water valve then heres my setup
http://imageshack.us/photo/my-images...antbypass.jpg/

3 feet of 5/8ths hose, just swing the hot water valve over to the new location and you will have an engine free of pipes
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Old 10-23-2012, 10:56 PM
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