you voted for the heater core? 
Dreaded Heater Core or something else?
Thread Starter
Pro
Joined: Sep 2001
Posts: 542
Likes: 1
From: Stuck in the 80's
Dreaded Heater Core or something else?
Well I noticed a small amount of coolant on the floor, figured it was the 30 year old OE water pump 
but it looks like it is coming from below the heat/AC box and running down the frame. From what I have read and as is usually the case a leaking heater core drips inside the passenger side on the carpet. My carpet is dry and no fogging of the windshield. I guess bottom line questions is can the heater core be leaking and dripping on the outside of the box instead of inside the car?
TIA and HO HO HO Merry Christmas!
but it looks like it is coming from below the heat/AC box and running down the frame. From what I have read and as is usually the case a leaking heater core drips inside the passenger side on the carpet. My carpet is dry and no fogging of the windshield. I guess bottom line questions is can the heater core be leaking and dripping on the outside of the box instead of inside the car? TIA and HO HO HO Merry Christmas!
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Race Director
Joined: Mar 2015
Posts: 15,926
Likes: 579
Melting Slicks
Joined: May 2014
Posts: 2,891
Likes: 591
From: New Port Richey FL
I tend to Agree with the above that the Heater Core is raining on your day, But I will offer 1 Glimmer of hope. Have you taken a look at the Heater Core Bypass/Shut Off valve, It's just in front of the Heater Box along the inner fender well. I have seen the shafts leak on them. Exhaust all under hood possibility's first
Last edited by s carter; Dec 20, 2016 at 09:51 PM.
Oil Producer
Joined: Apr 2014
Posts: 9,365
Likes: 2,734
unless you have mega holes in your floorpan and no carpet to soak it up, its not your heater core. you guys saw the coolant is under the car right?
not sire of year but if 30years old is right then i guess you have an 86 or 87. Check the crossover tube that comes from the rear of the pssenger head, at the passenger side of the distributor. Get a real bright light (i found mine using my iphone light) and look for wet/seepage/crud/evidence of leaking.
In my case, it was both the rear head bolts, and the crossover coolant tube that was leaking. So the
intake ->head gasket and the crossover gasket.
it was running down the back of the engine and dripping off the pssenger side of the pan or block.
This doesnt match exactly y your description of where your drip was coming from but worth a shot. I assume you looked at the rubber hose couplers that connect the hard coolant lines to the hard heater core lines.
Merry Christmas. VT
not sire of year but if 30years old is right then i guess you have an 86 or 87. Check the crossover tube that comes from the rear of the pssenger head, at the passenger side of the distributor. Get a real bright light (i found mine using my iphone light) and look for wet/seepage/crud/evidence of leaking.
In my case, it was both the rear head bolts, and the crossover coolant tube that was leaking. So the
intake ->head gasket and the crossover gasket.
it was running down the back of the engine and dripping off the pssenger side of the pan or block.
This doesnt match exactly y your description of where your drip was coming from but worth a shot. I assume you looked at the rubber hose couplers that connect the hard coolant lines to the hard heater core lines.
Merry Christmas. VT
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Oil Producer
Joined: Apr 2014
Posts: 9,365
Likes: 2,734
The top and bottom hose are not the same size. Take a portion of the hose to the store and get some coolant hose to match.
Thread Starter
Pro
Joined: Sep 2001
Posts: 542
Likes: 1
From: Stuck in the 80's
Yep, I know I would screw up the nipples trying to pull off 30 yr old hose that's melded to the metal, this will likely become a hose replacement party!
Race Director
Joined: Mar 2015
Posts: 15,926
Likes: 579
