Question on blocking off the heater core on a C2

[Frank D.]

Re: Question on blocking off the heater core on a C2

I don't know how radical I would get on a solution to a problem that you're anticipating but might never occur during your ownership..

Frank>Very true BUT if you put a search on this subject it has been a big big headache for many. Your last statement above could also be a " oxymoron.." Larry P.S. I would not hesitate to put a new one(Core) in but there is not one made in the entire world that has longevity/quality with it. JMHO[/QUOTE]

I've changed 2-3 heater cores in many decades of driving vintage cars and one of them was only because it was a crummy repop actually epoxied together instead of soldered. Not being attentive to coolant maintenance and too much yanking on the heater core nipples is generally the cause of failures... Having said that I guess the OP could put some properly sized restriction in the hoses and block off the core...and it would be invisible...

[Frank D.]

Re: Question on blocking off the heater core on a C2

All-------


While it can be done the way described for many vehicles, I don't think it can be done that way for any 63-72 Corvette with an aluminum radiator. These cars all use an external supply tank. If the hoses are blocked the supply tank is effectively removed from the system.

Fair point and still another reason to leave well enough alone..

[Joseph S.]

Re: Question on blocking off the heater core on a C2

Larry, you can't plug the fitting going into the waterpump from the fill tank. You need this open in order to fill the system.

[Duke W.]

Re: Question on blocking off the heater core on a C2

One way is to place a valve somewhere in the 5/8" hose off the inlet manifold. This will essentially eliminate coolant flow to the core, but leaves the other end open so the expansion tank is still in the system. This will eliminate at least 95 percent of the heat transferred to the pass. compartment, but won't fix a leak because the core will still be connected to the system on the outlet side and, therefore, pressurized.

The other way if you want to COMPLETELY eliminate the core from the cooling system is to simply look at section C-48 of you AIM and configure as if the car has this heater delete option. It will require a few dollars in small parts from a hardware or auto supply store.

Duke

[Mark E.]

Re: Question on blocking off the heater core on a C2

All-------


While it can be done the way described for many vehicles, I don't think it can be done that way for any 63-72 Corvette with an aluminum radiator. These cars all use an external supply tank. If the hoses are blocked the supply tank is effectively removed from the system.

If the car has an expansion tank, bypassing the heater core in a less visible way is easier: Route the heater hoses to and from the engine and tank without going to the heater core.
See https://www.forums.ncrs.org/showthre...097#post869097

[Harry S.]

Re: Question on blocking off the heater core on a C2

I knew I had to remove my interior heater box for a repair. All I did was take some house copper tubing and two 90 degree bends and solder them together. I made a U and attached the hoses. I ran that way for months as I fixed my heater box. Just remember, a dry heater core is like a dry original radiator, it falls apart quicker from corrosion.

[William F.]

Re: Question on blocking off the heater core on a C2

That's the way to do it Duke. All that other stuff about making it "invisible" is way too much sugar for the nickel as we say down south.

[Dale P.]

Re: Question on blocking off the heater core on a C2

I removed the hoses and pluged the water pump and intake manifold opennings

[Ralph E.]

Re: Question on blocking off the heater core on a C2

Larry, simplest solution is to add a plug at the water pump and another at the "T" at the expansion tank.
See your AIM, C-48/A1 Less Heater Equipment

[Domenic T.]

Re: Question on blocking off the heater core on a C2

To save time and hassle why don't you just remove the heater hoses at the firewall going into the heater core and fill the ends with silicone carefully leaving enough room to plug the hoses back into the heater nipples. Later you can just replace the hoses if you want heat or spend the time to replace the heater core. If the existing heater core ever leaks it won't be much as most has drained when you remove the lower heater hose.

JR

Joe, I used balls out of bearings to plug the hose. I was able to buy the balls seperatly as they were used on bypass systems with adjustable spring tension.

[Ralph E.]

Re: Question on blocking off the heater core on a C2

Larry, simplest solution is to add a plug at the water pump and another at the "T" at the expansion tank.
See your AIM, C-48/A1 Less Heater Equipment

Larry, I forgot to add. Install the heater hoses over the plugs and all will look stock.

[Larry E.]

Re: Question on blocking off the heater core on a C2

Larry, I forgot to add. Install the heater hoses over the plugs and all will look stock.

Ralph>Thanks for the idea's. Your idea and Post #24 is good also. For now my original Core IS NOT LEAKING BUT>>I
know it will in the future at some point. Will see what happens. Larry