OK, now I'm getting pissed. As you may know, I've just launched into this heater core replacement on my new (to me) 98 F-150. Thanks to the fellow who responded to my first post, I at least understand how the clamp is supposed to work. ( I still can't get the things off, but I think I'm headed in the right direction.)

Now, I've come across a worm-type clamp on one of the heater core hoses, and a bell goes off, telling me this has been replaced before, the truck has only got 85K on it, and I just read a couple of posts talking about electrolytic attack on the core. ( One even purported to include a "TSB" covering the problem, but there's no number associated with the text.)

So, to end this rambling mess up, can anybody weigh in on this issue? I'm already frustrated enough to take this thing to the dealer, but don't think they're even aware of the notion, and I don't wanna have to do that again in a few years if this electrolytic thing is gonna recur. On the other hand, I've got another ride, and could stretch this job out, do it myself, and take steps to prevent recurrrence.

 

I feel your pain.

I used a discount auto parts core, made of copper/brass. It is a nice piece and not constructed anything like the original. My only concern with the copper/brass core is the junction between the tubes and the core itself. It seems to be a weak point. The instructions direct you to make sure the tubing is secure so that engine movement will not break the tubing.

The heater box has a small moulded plastic cover over the tubing that relieves some stress on the heater core. Filling that plastic part with RTV or great stuff will ensure no stress reaches the core.

A copper/brass core should last a lifetime.

Aluminum is prone to leakage, including aluminum intercoolers, radiators, heater cores, condensors, evaporators etc! AND, not all leaks are caused by electrolysis. Mine leaked at a seam. I cut it apart and there was no corrosion what so ever.

The tabs on the heater hoses are a real pain. Make sure you do not drop the 2 o rings or the o ring spacer when taking it apart. SQUEEZE HARD!!!!

Chris

 

Thanks, Chris...I'll take a deep breath and start again.

 

Radiator systems with dissimilar metals create this galvanic action. Anti-freeze should be changed every year because it will become acidic over time and eat away at the metals in your engine, heater core and radiator.