How to replace the heater core to a chevy astro 2003

check the hoses to the front heater core. It sounds like the front heater core is plugged.

Hello,
Here is a link that will tell you whats involved with changing the heater core

Product HowTo Info REPLACE AutoZone com
I hope this helps.

Good Luck!
Rich Lilja

Blocked air intake to system?

can be clogged heater core,try inspecting the heater core.

HEATER CORE REPLACEMENT

If its clogged it can be cleared with the use of Garden hose p[ump.The water has to be turn into the heater hose line and then water has to be removed out via the pump.

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For complete step by step procedure,refer heater core flushing and other help links mentioned below.

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Click the link below:-----

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How to Flush Heater Core?

http://schematicsdiagram.blogspot.com/2011/12/how-to-flush-heater-core.html

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How to replace heater core on Chevy Astro?

http://schematicsdiagram.blogspot.in/2012/03/how-to-replace-heater-core-on-chevy.html

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Replacing heater core for grand marque?

http://schematicsdiagram.blogspot.in/2012/03/replacing-heater-core-for-grand-marque.html

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How to replace heater core for All car models?

Click the link below:---

http://technoanswers.blogspot.com/2011/11/how-to-replace-heater-core-for-all-car.html

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How to replace heater core on Buick Regal?

http://howtobyme.blogspot.in/2012/02/how-to-replace-heater-core-on-buick.html

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How to Remove Heater Core on 2008 Honda Odyssey?

http://howtobyme.blogspot.com/2011/12/how-to-remove-heater-core-on-2008-honda.html

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Honda Heater Core Replacement?

http://howtobyme.blogspot.com/2011/12/honda-heater-core-replacement.html

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How to replace heater core on Mitsubishi magna?

http://technoanswers.blogspot.in/2012/02/how-to-replace-heater-core-on.html

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How to replace heater core on Mitsubishi eclipse?

http://technoanswers.blogspot.in/2012/02/how-to-replace-heater-core-on_10.html

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These will help.

Thanks.

Charles,when they get clogged,you must replace,need help doing that,if so then we need the year,make ,model and engine size.

Heater Core Removal & Installation To Remove:

1. Drain the engine coolant.
2. Release and reposition the outlet heater hose clamp at the heater core.
3. Remove the outlet heater hose from the heater core.
4. Release and reposition the inlet heater hose clamp at the heater core.
5. Remove the inlet heater hose from the heater core.
6. Remove the screws that retain the cover to the heater case assembly.
7. Remove the straps that retain the heater core to the heater case assembly.
8. Remove the heater core from the vehicle.

To Install:

1. Installation is the reverse of removal.
2. Refill the cooling system.

hello, should be able to get to heater coil on passenger side under dash, you will have to pull a cover thats over the heater coil off, there should be between 5 and 10 screws that hold cover on.

Hi its your heater core that went bad

the problem is probably the heater core, it can become clogged with dribris. this stops heat from the engine getting to it and then no heat.

SOUNDS AS THOUGH THE HEATER CORE IS PLUGGED. TRY BACK FLUSHING IT AGAIN. IF YOU STILL GET NO FLOW IT IS MORE THAN LIKELY PLUGGED AND WILL NEED TO BE REPLACED. THE TUBES ARE VERY SMALL AND PLUG EASILY WITH RUST.