Copper vs Aluminum heater core for 71 valiant

MCPObr44 said

Here's a thought.

I wonder if having dissimilar metals in the cooling system would eventually cause a problem. My radiator is aluminum, the block is iron, and the heater core is brass/copper.

Hmm.

Click to expand...

Yes, the dissimilar metals is what causes electrolysis, its like copper and lead in a battery, one metal eats at the other and the liquid becomes a charge, this is what causes that sludge that builds up in the cooling system. Distilled water and modern antifreeze helps combat this problem.