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Flushing Heater Core

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Old 20 Nov 2019, 11:27 pm
CherylM's Avatar
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Join Date: May 2011
Location: 3rd Rock
Posts: 25
Default Flushing Heater Core

2007 PT Cruiser - Limited Edition
110k miles

I have been having trouble with no heat in my car. After doing some checking it seems to be a heater core problem so I want to flush it. I already have a big jug to put the water/old antifreeze in as it runs out. My question is what size hose should I get to attach to the car's hoses ? Also does it matter what kind (material) of clear hose I should get ? Would a generic plastic hose do the trick ? Would I need an adapter to put on the plastic hose to attach it to the heater core hoses, or would the one that is already there be ok ? I also want to get a heater core flushing tool too. Any particular antifreeze you would recommend for the PT Cruiser ?

Any suggestions would be appreciated.

Last edited by CherylM; 20 Nov 2019 at 11:59 pm.
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Old 23 Nov 2019, 08:43 am
Obsessed Cruiser
Join Date: Aug 2015
Location: Lake Wales, FL
Posts: 5,011
Default Re: Flushing Heater Core

I've always just left the heater hoses attached to the heater core and removed them from the engine block. After draining them, I put as much CLR in them as they and the heater core will hold, tie them to the hood so nothing runs out and let it sit for a couple of hours. Then I just lay one hose on the ground and push my garden hose against the other and flush it for about ten minutes or until the water runs clear. Then I swap hoses and flush it the other direction. No special hoses, attachments or tools are needed. Just a little common sense.

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Old 23 Nov 2019, 01:22 pm
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Join Date: Jun 2014
Location: southeastern PA
Posts: 370
Default Re: Flushing Heater Core

I believe Cruisers take Zerex G-05, with Hybrid Organic Acid Technology (HOAT) chemistry antifreeze. That's what I've run in my '01 Cruiser since new with no problems.
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