Im looking for a diagram of heater core replacement procedure for a 1993 chevy s10 truck

Tyrone, Check the attached links,instruction and guides, the last link has some very good info. and pics. on S10 heater core replacement. Good luck.
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Heater core replacement procedure 99 S10

The water cock is stuck closed,not letting coolant to circulate thru heater core.

google "how to replace the heater core on a chevy s10 pickup"
and it will come up with lots of video and text on how to do this

Check the water control valve . It most likely isn't letting coolant into the core.

For heater core replacing procedure.I suggest you to go through this related help links.Its all complete step by step procedure :----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 Flush Heater Core?

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

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How to Remove Heater Core ?

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

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

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To replace heater core? http://technoanswers.blogspot.in/2012/02/how-to-replace-heater-core-on.html------ How to replace heater core? http://technoanswers.blogspot.in/2012/02/how-to-replace-heater-core-on_10.html
----------This will help.Thanks.

For heater core replacing procedure.I suggest you to go through this related help links.Its all complete step by step procedure :----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

--------------
How to Flush Heater Core?

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

---------------
How to Remove Heater Core ?

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

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

------------
To replace heater core?http://technoanswers.blogspot.in/2012/02/how-to-replace-heater-core-on.html------How to replace heater core?http://technoanswers.blogspot.in/2012/02/how-to-replace-heater-core-on_10.html
----------This will help.Thanks.

If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing

• The heater housing is usually under the dash and must be removed to gain access to the heater core.
• Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.

The heater housing is disassembled to get to the heater core. Heater Core

• Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
• Remove the heater coolant hoses.
• Remove the cable and/or vacuum control lines (if equipped).
• Remove the heater core securing brackets and/or clamps.
• Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
• To reinstall the heater core, reverse the removal steps.

When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

Hi,

Please check this webste:

http://www.youtube.com/watch?v=687B2pspF2w

Please accept if this helped you.

Thanks

http://www.fixya.com/cars/t3722263-change_heater_core_in_2001_chevy_blazer

heater core or leak on cooling system