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Heater Core care

Forum: C3 HVAC, Fuel, Emissions, and Exhaust

11 Messages
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Heater Core care

Posted: 4/21/05 6:03amMessage 1 of 11
w
windrider1200
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Clifton, NJ - USA
Joined: 10/3/2003
Posts: 142
Vette(s): 1972 Coupe Ontario Orange Black leather interior LS-5; Turbo 400

I'm putting my BB back together again, and since I'm only going to drive it in warmer weather, I don't intend to reconnect the heater hoses.  I still plan to leave the heater hoses connected to the heater core.  My question is anyone have any thoughts on the best way to prevent any corrosion while it's not connected.

Flush & drain the core totally, and leave dry?

Flush and refill with distilled H2O?

Flush and refill with antifreeze mix and plug hose ends?

 

TIA

 

BB NJ Ken

 

1972 T Top 454; "Boomer" Latest "upgrades": 1 1/8" front Stabilizer bar. Rebuilt SS calipers with O-ring pistons. Under car Chambered exhaust. Fiberglass rear spring (360lbs/in). Bilstein Rear Shocks. 3/4" Rear Stabilizer Bar. Tow hitch. Performer manifold with 600 cfm Holley. Comp Cam 262 .499 lift. L-88 Hood in process

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Heater Core care

Posted: 4/21/05 8:28amMessage 2 of 11
k
knotacare
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Newark, DE - USA
Joined: 7/26/2004
Posts: 468
Vette(s): 1968 Conv, 454HO,500HP-600TQ, TKO-600,3:70 HD rear,hotrod air, custom paint & suspension,1973 Ruby Red,T-top, 383 Stroker, TK)-500,frame off restro, 1967 Dodge Coronet, 340 stroker to 406, Dana 60

I would use a mixture of antifreeze & water...fill from bottom hose & seal ends

Alan

                                               

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Heater Core care

Posted: 4/22/05 4:35pmMessage 3 of 11
E
Eddie 70
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Kingston, TN - USA
Joined: 7/5/2003
Posts: 900
Vette(s): 1970 Vert Both Tops Kiesler 5 Speed Steeroids Rack and Pinion Stayfast Convertible Top
I have wondered about this when I read about folks putting in a heater core shut off valve. I mostly wondered if coolant just setting in there and not moving is going to be doing some kind of damage.

Opinions?
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Heater Core care

Posted: 4/22/05 5:03pmMessage 4 of 11
k
knotacare
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Newark, DE - USA
Joined: 7/26/2004
Posts: 468
Vette(s): 1968 Conv, 454HO,500HP-600TQ, TKO-600,3:70 HD rear,hotrod air, custom paint & suspension,1973 Ruby Red,T-top, 383 Stroker, TK)-500,frame off restro, 1967 Dodge Coronet, 340 stroker to 406, Dana 60

I was a boater for many years & every year I flushed my engine with fresh water then mixed a 50/50 mixture of antifreeze & water and filled the system. Sometimes the engine ( Chrysler Marine 318 V8) sat for 6-8 months, but when I checked & started it everything was always fine. I never had  the exhaust manifold corrosion problem that alot of my friends experienced. So I would have to say that air is the problem not the coolant.

Alan

                                               

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Heater Core care

Posted: 4/22/05 5:17pmMessage 5 of 11
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dwright
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Victor, NY - USA
Joined: 7/12/2004
Posts: 6842
Vette(s): 2004 Commemorative Edition Coupe, Auto w/HUD. 13K miles in 2015. Sold 1982 Red Coupe
Oxygen is not your car's friend. That's what causes the rust (oxidation) with just a little water or even condensation. A water-gygol mix filled to the top will minimize rusting.
Flush annually for best results.
 
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Heater Core care

Posted: 4/24/05 6:47pmMessage 6 of 11
2
2 cruzn
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Poquoson, VA - USA
Joined: 11/20/2004
Posts: 1024
Vette(s): 73 Conv, Blue-Green/White Top - 454, M21 - Dark Saddle Leather, Power Windows, A/C, Tilt/Tele, AM/FM St. (orig. and sounds like it too).#2 -- 2007 Coupe,3 LT package, Z51 option, Victory Red, Ebony Int. Clear Top.
Just like when a piece of metal is rasied from the water after 100's years and soon as it hits air it corrodes...
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Heater Core care

Posted: 4/25/05 6:27amMessage 7 of 11
S
StreetShark
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Fayetteville, NC - USA
Joined: 2/13/2005
Posts: 244
Vette(s): 1968 Corvette Convertable, 4 spd, 350 SB, Daily Driver
Heater shut off valves?  Do you put one in both lines?  Since I read so much about interior heat problems, this sounds like a simply fix to one of the greatest sources of heat.
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Heater Core care

Posted: 4/25/05 3:03pmMessage 8 of 11
r
runamuck
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Fall River, Canada
Joined: 9/17/2002
Posts: 64
Vette(s): 1972 conv. 454ci 4spd 1978 slv annv L48 autom
I have just completed this tast and I am very pleased with the result so far . check out this site http://temp.corvetteforum.net/c3/joeveto/Hot_Water_Shut-Off. shtml runamuck38467.6292361111

My Two Babies!!!!

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Heater Core care

Posted: 4/25/05 3:53pmMessage 9 of 11
E
Eddie 70
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Kingston, TN - USA
Joined: 7/5/2003
Posts: 900
Vette(s): 1970 Vert Both Tops Kiesler 5 Speed Steeroids Rack and Pinion Stayfast Convertible Top
Love the hot water shut off valve idea. I especially like the air bleed in the valve. That should help with refilling the system along with a couple of small holes in the thermostat. 
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Heater Core care

Posted: 4/25/05 4:08pmMessage 10 of 11
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Willis76
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Rockland, MA - USA
Joined: 1/30/2003
Posts: 585
Vette(s): 76, L48, 4spd & 09, LS3, 6spd

I put one in just like that the last time I flushed the cooling system. I used one of those Prestone back flushing kits, so as long as I cut the hose for that anyway - I put in the shut off valve when I was done.

It works and does make a difference.

 

 

 

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