Hey there, I've got a problem with my 70 Mustang. I started my car after work, let it warm up and one of my co workers coaxed me into breaking it loose, after that I noticed a drip on the passenger side floor and some smoke from under hood leaking from the drain hose of the HVAC box. I keep going through heater cores, they keep popping. i'm on my 5th one today within 6yrs. Any thoughts on why this is keeps happening....
Did someone remove the valve that regulates the heater temp to the air box?Not only that are your replacements aluminum or copper. The copper ones stand up better. I know it cost more. Its all those Hecto-Japenese parts we get today. If your heater core is copper see if someone can at a radiator shop can find the leak and pressure test it for you....I would try not to let the inlet and outlet hoses hang. Try getting them as long a hose as possibile.
Nothing has been removed from the system, and it is a copper replacement. I'm gonna remove it and have it checked and repaired. Also gonna run longer hoses just in case.
a few thoughts.when the thermostat is closed.. there is additional pressure built up by the water pump. this causes the coolant to flow through the heater core.. the elbow fitting in the intake manifold usually has some kind of restrictor in it.. if you have a stock manifold .. you will find that the underside of the elbow is extended into a second passage in the intake.. what's in there .. i don't know.. i have not examined a manifold off the engine to find out..cheep thin copper heater cores that just won't width stand the system pressures. excessive flow because of a blocked bypass hose...excessive mechanical back pressure because of excessive flow can expand the tanks and core causing leaks...excessive system pressure do to a high pressure nascar racing type of pressure cap... 30PSI.. can cause damage.. blocked coolant overflow tube. blocked or kinked coolant recovery hose can also build excessive system pressure.. leaking head gaskets or cracked heads .. can leak combustion gasses into the cooling system faster than the radiator cap can let them vent.. i know you don't have leaking head gaskets.. but this is theory..IMPROPER or not enough engine to firewall grounding... causing electrical current to flow thought the coolant between the alternator ground output and the body via the cooling system.. some people have found they need to add a ground strap around the neck of the heater core..pull the temp sender from the intake crossover... pick up some pipe thread bushing reducers so you can stick a 50 psi pressure gauge in the coolant passage to monitor the system pressure and the mechanical pressure built by the pump behind the closed thermostat.. this is just for a test while you are sitting still and revving the warmed up motor by reaching in a working the throttle lever ..