Start searching for a vacuum leak. The dash switch operates a vacuum assembly - but if the line is cracked, it "door" will not change position.
Check coolant level with truck cold.Add coolant if low.With engine warm and heater on check heater hoses under hood for warmth and fullness (to make sure coolant is passing through).If one or the other heater hoses is empty or collapsed then there's a problem with the water pump or heater control valve (located on one of the heater hoses)
Check operation of heater coolant control valve, and it's associated remote control mechanism.
Check that both inlet and return heater hose is equally warm, as this indicates coolant flow through the heater core.
If no coolant flow:-
Check cooling system is correctly filled, taking care to bleed off any air locks from the system as necessary (with heater coolant valve open);
Check heater core is not blocked.
SOURCE: y wont my heater get hot and my ac wont get cold?
Ok well every heating system and A/c system work very much the same...there are some troubleshooting Steps I would suggest...
First for the heating issue:
Step 1: Check Coolant level Low coolant can cause warm to cool air threw your heating system, not enough to fully heat...Caution: make sure the engine is cool when checking..You should have a tank that you can see the level..if not the top of the radiator is good.
Step 2: Any leaks in the coolant system, by just looking under the hood depending on the color, (Purple, Red, Orange, and Green) The system needs to obtain a certain Pressure to be effective..
Step 3: If all above checks ok...Assuming the blower motor is working correctly and good flow is present, there may be a vacuum leak or electronic divert-er malfunctioning( mixing cold and hot air thus getting warm air)
Step 4: Bring it to a shop, you may have a plugged heater core, an malfunctioning Thermostat, or an inefficient water pump...Hope this helps.
As for the A/c Not cooling...All cars that are 96 or newer must be charged with R-134a refrigerant...This can only be serviced by a shop that can deal with A/C recharging...could be low refrigerant, bad a/c clutch, bad compressor good luck hope this help
To troubleshoot this types of problem,click the link below
:----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the
issue.
------
Engine Overheats and heater
blowing cold?
http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
---------
Heat blows cold on drivers
side and hot on passenger side?
http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html
-----------
No heat on car?
http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html
------------
Heater blows intermittently and temp
gauge goes erratic?
http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html------------Heater blows cold?
http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html
---------Car heater blowing warm, but not
hot air?
http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html--------
Heater/AC blower motor not working?
http://technoanswers.blogspot.in/2012/02/heaterac-blower-motor-not-working-on.html
------------
A/C, heater, defroster fan, not
working?
http://technoanswers.blogspot.in/2012/02/ac-heater-defroster-fan-not-working.html
Heater problem?
http://technoanswers.blogspot.in/2012/02/heater-problem-on-isuzu-trooper.html---------
This will help.Thanks.
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