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Heater needs Heater Core, Heater control valve, air diverter inside the car and hot water in the heater core. If you just change the thermostat you must have had a reason. If the car was running hot it could be a radiator clog. If the core is clogged no heat. If the heater core was drained when you changed the Tstat there may be air in it - if so no heat. If the control valve (on the heater hose) does not shift- no heat. If the diverter door in under the dash does not direct the fan air through the heater core- no heat.
Its behind the dash
Usually a fairly big job
Follow the 2 hoses in the engine compartment that go into the firewall
Thatll at least tell you where it is located on the other side
Btw...if its just clogged..have you tried disconnevting those 2 hoses and running some CLR into it, letting it sit and then flushing it
Just an idea
It works well
Well if your 1500 is any thing like my 03 2500 hemi 4+4 then you need about six hours of free time. The heater core is behind the passenger side dash area you have to first begin to take the front dash all the way apart and I mean all instrument cluster drop steering wheel from middle support bracket after that you will disconnect the ac lines into firewall this is not easy task but can be done with specialty ac tool then in both sides passenger four bolts on each side take those the whole dash can then be pulled back far enough to take two hoses of heater core and in engine compartment four bolts hold it in then follow steps to install
This can be a very involved procedure in some cars due to the location of the heater core, often buried under the dashboard.
I'd recommend spending (investing) ~$20 to buy a service manual which should contain pictures and hints on how to do that and most other things on your car.
Haynes Service manuals
My sympathy goes to the shop. If they forgot to re-attach something it may be unreachable and they may need to take it apart again. They must guarantee the work and make good on it. If they try and give you any BS about something else failing so they can charge you again, request to have the part returned to you have an independent party check it and if it is good or has been tampered with ....you can go from there. good luck
when u do this take your time, don't force anything, if it wouldn't come out then u missed a retainer somewhere, also the heater core requires taking apart the air ducting, and make sure everything is hooked back up, take allot of picture's before hand to document where everything goes, the manuals are for professional factory tech's and they assume allot of basic knowledge, in other words they don't spell out every little detail.