Clogged Heater Core Followup

Steve@Advance

Well-known Member
Looked at the Impala with the suspected heater core clogged.

Turns out it wasn't clogged, low on coolant.

Kinda suspected that would be the problem. I went ahead and flushed the core, drained and flushed the system through the disconnected heater hoses. The antifreeze looked a little brown, probably had some green mixed with the red.

Couldn't find a leak, but did find the cap bad, replaced it. Filled it with fresh antifreeze. It was very difficult to get all the air out. Starting and stopping the engine seemed to be the trick, couldn't find a vent. Once it was crammed totally full the heater started working.

I suspect there is probably a leak, likely a head gasket. I had so much water dripping from the flushing, couldn't see a leak if there was one.

Told her to keep an eye on it, hope for the best. Recent widow, raising her grand child, house full of dead beat kids that won't help... Guess what I'll be doing in a few days!
 
I had a similar situation with my wife's Gran Prix (probably same engine). Could always tell when it was low on fluid because you could hear it sloshing, with air, through the heater core. Checked several times and could not find a leak. Finally saw a trace leaking out the water pump.
 
Agreed. GM cut some serious corners on their gaskets and are notorious for the intake manifold gaskets leaking. What usually happens is the intake manifold gasket leaks the coolant to a very low level and the engine overheats warping the heads. Then you are looking at a massive bill with the entire top half of the engine torn down. We've seen it with 4.3 engines in pickups, 3.8 and 3.9 engines in Impalas.
 

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