Dumb hose question
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,961
Likes: 2
From: Fort Knox
Dumb hose question
What is the name of the water hose directly below the intake plenum on my 86L ? Its a large water hose, abut 2" diameter that goes into and behind the thermostat housing. Of course my Haynes manual doesnt say anything about it, hence I do not know what to call the hose. The hose is collapsed, but not leaking, so I just need to be able to tell the monkey at Vatozone what hose I need. I think its called something like "heater intake exhanger hose" or thats at least what its purpose is. I just want to be able to tell the guy behind the counter.
Thanks
snoopdan
Thanks
snoopdan
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
you ain't gonna get that at Autozone...
It's a molded hose. It is the "Throttle Body Heater" hose. GM part number 10108509. Call Chris at Superior Chevy, see if he has it, or, if it's still stocked.
This is what I did... Got a length of hose and ran it from the intake over to the heater line... bypassing the Throttle body. If nothing else, it removes that many connections that could cause a coolant leak.
Also gets rid of heat at the throttle body.
You may have read about this trick, it's called the "throttle body bypass". I donno if it buys power, but eh, those hoses are a pain in the *** anyway.
It's a molded hose. It is the "Throttle Body Heater" hose. GM part number 10108509. Call Chris at Superior Chevy, see if he has it, or, if it's still stocked.
This is what I did... Got a length of hose and ran it from the intake over to the heater line... bypassing the Throttle body. If nothing else, it removes that many connections that could cause a coolant leak.
Also gets rid of heat at the throttle body.
You may have read about this trick, it's called the "throttle body bypass". I donno if it buys power, but eh, those hoses are a pain in the *** anyway.
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,961
Likes: 2
From: Fort Knox
I read somewhere that you can get 5-10 hp from doing the heater bypass mod. .....yeah.....right. 
Just means it will suck more when I have to run the car in 20 degree weather. I swear I was having a brain fart, and couldnt think of what that hose was called. But ive been insanely busy for the last week, I cant even fix my website. Thanks bro for the part # 
I have a GM dealership down the road from me. But for my general knowledge, do you know a link to "DIY throttle body heater bypass" or similar? I just want to read up on what to do. Im always up for something new to learn.
snoopdan
Just means it will suck more when I have to run the car in 20 degree weather. I swear I was having a brain fart, and couldnt think of what that hose was called. But ive been insanely busy for the last week, I cant even fix my website. Thanks bro for the part # I have a GM dealership down the road from me. But for my general knowledge, do you know a link to "DIY throttle body heater bypass" or similar? I just want to read up on what to do. Im always up for something new to learn. snoopdan
Last edited by snoopdan; Mar 30, 2005 at 09:12 PM.
Le Mans Master
Joined: Jun 2002
Posts: 6,097
Likes: 0
From: High Plains Drifter Fayetteville, AR
Just bypass it. Supposedly the TB is heated to prevent icing in extreme temps from the venturi effect. I've had mine bypassed for as long as I've owned the car and I've drive in 0* weather with no ill effects.
Instructor
Joined: Mar 1999
Posts: 219
Likes: 2
From: Gainesville Florida
I've had mine bypassed for several years also with no problem.But I live in Florida. The icing condition exists in moderate temperatures all the way up to high temperature days. It is most prevelant on high humidity days. When warm moist air is passed through a restricted tube (venturii) the increased speed of the air drops the pressure and as a result the temperature drops drasticly. The lower temp causes the humitity to freeze in the venturii area causing the opening to get even smaller so a drop in the quantity of air causes the change in the mixture. A viscious cycle that in a car can cause a problem where you may have to pull over. The real problem is much more dangerous when it happens on an aircraft. Many planes have gone down due to carb icing. Aircraft have carb heat to apply to melt the ice. The heated hose on the car does the same thing in theory. Only the heat under the car hood is there anyway so the heater hose seams a waste of time. Just get rid of it. Les
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
the difference here is that the plenum doesn't have fuel in it at that point. Besides, there is enough residual heat in the intake and engine compartment that the damned thing ain't gonna freeze!
it's an easy job, really. I will take some pics of bastet44's and post them tomorrow.
it's an easy job, really. I will take some pics of bastet44's and post them tomorrow.
