Too much blockage in heater hoses or heater core.
Bypass valve may be stuck on "bypass" .
1. Remove bypass "Tees", but don't discard.
Replace with straight-through hose fittings.
The core may start leaking under the water pressure since there is no bypass hose.
Once the heater starts working, put Tees back in place. You need bypass protection or the engine will overheat.
What is/was the condition of the coolant.?? rusty?? did they flush the heater core? make sure heater core can flow water, you can use a water hose and ck for that.
Regarding this types of problem,i suggest you to go through this help links.Click the link below to go through the procedure and troubleshoot the problem :----
HOW TO REPLACE AN UPPER RADIATOR HOSE
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-upper-radiator-hose.html
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HOW TO REPLACE A LOWER RADIATOR HOSEhttp://schematicsdiagram.blogspot.com/2011/07/how-to-replace-lower-radiator-hose.html
----------How to Flush Heater Core?http://schematicsdiagram.blogspot.com/2011/12/how-to-flush-heater-core.html
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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
How to replace heater core on Buick Regal?
http://howtobyme.blogspot.in/2012/02/how-to-replace-heater-core-on-buick.html
----------This will help.Thanks.
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