Missing coolant line?
Thread Starter
Pro
Joined: May 2003
Posts: 671
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From: WATERFORD CT
Missing coolant line?
My 85 seems to be missing the slim line that runs from the metal lines on the passenger side of the engine compartment into the back of the intake manafold. Mine are capped off. Does anyone know what this line is for?
Team Owner
Joined: May 2002
Posts: 24,337
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Re: Missing coolant line? (montie98)
I'm not quite sure what the other guy is talking about. Your intake manifold has no coolant passages in the rear. There's just a pocket up front that connects to the heater/throttle body line, two sensors, the thermostat, and both heads.
Are you sure you're not getting it mixed up with the EGR tube that you see on all the other L98s? The one with foil insulation on it, that is usually degraded and coming off? The 85 doesn't have this. EGR is routed though the heads internally, so no ugly tube.
:cheers:
Are you sure you're not getting it mixed up with the EGR tube that you see on all the other L98s? The one with foil insulation on it, that is usually degraded and coming off? The 85 doesn't have this. EGR is routed though the heads internally, so no ugly tube.
:cheers:
Burning Brakes
Joined: Oct 2002
Posts: 835
Likes: 3
From: Water Winter Wonderland
Re: Missing coolant line? (montie98)
Dunno. My 90 used to have that hose before I installed the MiniRam. When I told my buddy who has an 86 about it, he thought I was dreaming!
IT DOES EXIST - at least on some models. But what's it for??????
IT DOES EXIST - at least on some models. But what's it for??????
Burning Brakes
Joined: Oct 2002
Posts: 835
Likes: 3
From: Water Winter Wonderland
Re: Missing coolant line? (montie98)
Thanks guys. Its definetly not the egr its a coolent line.Anybody have one for sale?
:cheers: -Bill
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Team Owner
Joined: Apr 2001
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From: Dallas TX
Re: Missing coolant line? (CentralCoaster)
I'm not quite sure what the other guy is talking about. Your intake manifold has no coolant passages in the rear. There's just a pocket up front that connects to the heater/throttle body line, two sensors, the thermostat, and both heads.
Team Owner
Joined: Apr 2001
Posts: 22,267
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From: Dallas TX
Re: Missing coolant line? (ELEVENS)
Ok, see the fuel lines (2) .. look right next to them (right) there is a black hose that looks like it goes behind the engine. That's a coolant line that goes to the rear of the passenger head. :D
Drifting
Joined: Nov 2001
Posts: 1,783
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From: Latham NY
Re: Missing coolant line? (montie98)
85's don't have a cooling line going to the back of the manifold. Are you talking about the thin black plastic vacuum line?
[Modified by Bluevette85, 10:39 PM 5/8/2003]
[Modified by Bluevette85, 10:39 PM 5/8/2003]
Burning Brakes
Joined: Apr 2001
Posts: 799
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From: Fremont CA
Re: Missing coolant line? (CentralCoaster)
Now I'm curious. Does anyone have any pics of the line in question?
Passenger side rear of engine.
Coolant line is highlighted in blue.
Closeup of the fitting under the distributor.
The coolant line runs from the back of the intake manifold to a "tee" by the wheel well. One end of the "tee" goes to the surge tank, and the other goes to the radiator.
Safety Car
Joined: May 2003
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From: Vette-hid.com Lost in DFW texas
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St. Jude Donor '06-'07
Re: Missing coolant line? (Bluevette85)
cold start line it is a mod my buddier told me it was a cold start injector line on my 89
he said i should remove it also.
he said i should remove it also.
Team Owner
Joined: Mar 2000
Posts: 83,383
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From: Boston, MA
Re: Missing coolant line? (crash1mac)
It is my understanding that it is there to promote coolant passage in the rear of the manifold and to bleed off steam. I didn't think this showed up until the aluminum head cars though.
Burning Brakes
Joined: Jul 2002
Posts: 871
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From: Costa Mesa CA
Re: Missing coolant line? (montie98)
Yeah, there is no coolant line on an '85. My '87 had one but I took it off. It went from one of the hard heater core lines to the back of the manifold in front of the distributor on the passenger side. It went into a brass fitting at about a 45 degree angle. But I blocked off the EGR pipe as well. Less heat into the manifold the better. No codes.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
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From: Australia
Re: Missing coolant line? (BIG JIM 54)
I'm with Scorp.
Previous posts on this line have come to that conclusion.It's not big enough to have any affect on cooling , ie no flow.Certainly a delete option.
Previous posts on this line have come to that conclusion.It's not big enough to have any affect on cooling , ie no flow.Certainly a delete option.
Drifting
Joined: Jul 2000
Posts: 1,661
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From: Phoenix, Arizona
Re: Missing coolant line? (montie98)
Many threads on this one - never a convincing answer. The line is to eliminate steam/air pockets at the rear of the engine, reducing a hot spot area. I think '88 was the first year and I don't know if '90-91 cars had it either. If you change manifolds to a mineram, etc. you do away with it. I've always wondered if it's needed - assuming you "pack" the cooling system properly. The replacement heater hose with the "T" built in is very expensive and hard to find too.
Instructor
Joined: Sep 1999
Posts: 197
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From: Ridgefield CT
Re: Missing coolant line? (NavyVet)
It's called an air blend pipe. The pipe allows any trapped air to be purged into the heater system and then into the rest of the cooling system. Pre 90, the radiator fill port is below the highest coolant point in the engine. The pipe helps eliminates a potential air pocket in rear of engine.