Here's the scenario:

1. Replaced the heater core after a small leak developed
2. Bled the coolant system to infinity and beyond

Just not getting the heat I should be (or have in the distant past). In a one hour drive, down here in Tx where it really hasn't got cold yet, I'll have the temp control full hot with the fan on mid-high.

What else should I be checking?

TIA, and have a good one,
Mike

 

Feel both heater hoses to see if they are the same warmth. This will help prove that coolant is flowing in/out of the core. If ok, then it might be the mix door inside the car that is not letting the warm air through. It is controlled by a cable from the temp ****. You would have to get under the dash to check its operation.

 

Shoebox,

Sorry, should have mentioned the air door was checked out OK. And, it *does* get heat into the interior, just not as much as it should.

Is there something that regulates how much coolant goes to the core that could be clogged?

Thanks again, and have a good one,
Mike

 

There is a flow reducer on the heater hose, but that does not regulate heat. Maybe one of your hoses is clogged. When I flush the core, I always do it by removing the hoses at the water pump to be sure I flush the hoses and the core.

 

Do you just use a garden hose to flush the lines? I'd probably disconnect them from the firewall, just to keep from shoving a bunch of junk into the heater core.

Thanks for the info, and have a good one,
Mike

 

A garden hose is fine and it does not need a lot of pressure. However, if one of the hoses is clogged, you won't solve anything without flushing them, too.

 

SB, one more question:

To make things easier I was going to just disconnect the heater hose at the bleed air fitting going to the radiator and the water pump, and not worry about disconnecting the lines at the heater core also.

But, I don't want to flush any gunk from the restrictor into my new heater core. Can you tell me which line has the restrictor in it? Gut feel says it's the line from the water pump, but that doesn't have to be the case.

Thanks again for all your help, and have a good one,
Mike