3.1 mystery hose

[89GP_SE]

So long story short, my coolant is leaking.

 

There are two coolant hoses, about the size of heater core hoses, under the rubber air intake hose. What are the two hoses for/called. They look like they run to the intake manifold, anyone know what im talking about?

 

Ill try to get pics soon.

[carkhz316]

Throttle body coolant/ heater hoses.

[RobertISaar]

Throttle body coolant/ heater hoses.

 

the "de-icer" hoses.... what a lame idea.

[carkhz316]

^indeed

[89GP_SE]

so what is the hose size, standard heater hose size?

 

looks like a pain in the ass to get at, the worst part is they leak right on to the ex manifold and steam is everywhere

[carkhz316]

I think they're smaller than heater hose, I think. As far as getting at them, last time I had my TB off for cleaning, you can get at them if when you remove the TB

[RobertISaar]

better idea: cut the metal line and hook a hose up to it and bypass the TB altogether... whats the worst that could happen? i really don't think that the TB will ice, especially being 8" above the exhaust crossover, unless its -20*, and you just start and drive with no time to let it warm up...

[Crazy K]

the size is 3/4 inch, iirc. I have simply replaced them stock heater hose.qq

 

don't bypass them. they keep the throttle bottle warm so the throttle doesn't freeze.... and are not an effect on performance. look on 60degreev6.com myths iF in doubt.

[89GP_SE]

Welp at night its still hitting minus 20 around these parts, ill just replace the hoses. They are there for a reason, better not to rock the boat.

[RobertISaar]

the size is 3/4 inch, iirc. I have simply replaced them stock heater hose.qq

 

don't bypass them. they keep the throttle bottle warm so the throttle doesn't freeze.... and are not an effect on performance. look on 60degreev6.com myths iF in doubt.

 

 

i will agree with you on the fact that it probably won't add power, but i seriously doubt the TB will freeze. my 95 came without it and i've driven on days where -20*F was the high of the day and i've never had issues.

[Crazy K]

i will agree with you on the fact that it probably won't add power, but i seriously doubt the TB will freeze. my 95 came without it and i've driven on days where -20*F was the high of the day and i've never had issues.

 

they added coolant lines in later years to the 3x00 engine, would they have done that if it wasn't necessary?

 

it is a safer than sorry move.

[rockfangd]

I have never had a problem with a TB freezing lol. Mine doesnt have the heater

[Crazy K]

I have never had a problem with a TB freezing lol. Mine doesnt have the heater

 

the earlier 3100 didn't maybe from 94-96... but iirc 97 or 98+ cars had them again.

 

although the Abody 3100 with a different style throttle body had the TB lines in 95 and 96 (don't know in 94)

 

figure there must be a reason.

[5speedz34]

If you do bypass it just go to the auto parts store and look for pre-bent hoses.

[RobertISaar]

I have never had a problem with a TB freezing lol. Mine doesnt have the heater

 

figure there must be a reason.

 

because gm wanted it to be a pain in the ass... kind of like obd1.5, theres no real reason for it, just there to confuse and enrage the owners..... did any of the earlier motors have coolant running through their throttle bodies? i'm thinking it could be an emissions/fuel economy type of thing as well.

[Crazy K]

because gm wanted it to be a pain in the ass... kind of like obd1.5, theres no real reason for it, just there to confuse and enrage the owners..... did any of the earlier motors have coolant running through their throttle bodies? i'm thinking it could be an emissions/fuel economy type of thing as well.

 

That's the funniest thing i have ever heard!!!

 

 

they started adding them when they went to fuel injection because throttle butterfly moved so far away from the engine that there is a possibility it might freeze up under the right conditions. if you remember what a carb was they were usually centrally mounted on the intake, so they would get some heat soak... plus they had a thermostatic damper door in the intake that would suck air off the exhaust manifold when cold to help warm them to operating temperature when cold.

[RobertISaar]

picture this: 83 elcamino with a 355, a ridiculous cam, full headders, full 3" exhaust with 2 turbo mufflers dumped to the ground right after the rear axle, a 750 holley double pumper.... yeah i remember carbs.

 

oh and i made a "fix" for "freezing" it involves a very carefully (ie. DREMEL) placed square hole 1.5X2" sucking air right off of the exhaust crossover...

[pontiacmaniac94]

I have never had a problem with a TB freezing lol. Mine doesnt have the heater

 

the earlier 3100 didn't maybe from 94-96... but iirc 97 or 98+ cars had them again.

 

although the Abody 3100 with a different style throttle body had the TB lines in 95 and 96 (don't know in 94)

 

figure there must be a reason.

 

yah, the 94 W-s didnt come with it, atleast Gp wise....i have a throttle body off of a 97 montana i am workin on throwing on, and it has the heater hose, but i feel lucky, and going to leave off.

 

 

[5speedz34]

The only reason I would leave it off is to make it easier to for removal of the TB.

[Robby1870]

Just so everyone knows this is possible:

 

When I had my first car, 92 GP sedan, 3.1L, I did the TB coolant by-pass on it. While in undergrad temperatures one night got to -10 to -15F and I had to go to work the next morning. Car started sorta fine for being -10F but when I went to press the gas pedal nothing happened. The pedal moved some but the engine did not rev up. Had to let it run for like 15min before I could drive it.