Heater in truck blows either cold air or no air.

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07 Tucson heater blowing cold air - Hyundai Forum - Hyundai ...

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Dec 16, 2009 - I have a 2007 Tucson, when you turn on the heater it only blows hot air... Join Date: May 2005 ... a low coolant level will exhibit the first stated symptoms of no heat/low heat at idle and increased heat at cruise due to an air ...

Denlors Auto Blog » Blog Archive » Car Heater Blows Cold ...

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Oct 10, 2009 - When a car heater blows cold air, there are several possibilities that should ...... On my Dodge Neon when I turn on the heat it blows out cold air.

Heater blows only cool air...even w/ defroster on : Buick ...

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... Cadillac, Chevrolet, Chrysler, Dodge, FIAT, Ford, Geo, GMC, Honda, Hummer,Hyundai, Infiniti, Isuzu, Jaguar ... I'll turn up the temp on the dual control to get heat,

Could be the air flaps of the heater unit are set incorrectly or not working at all or possibly the heater radiator is blocked or semi-blocked or perhaps there is something wrong with the heater hoses or the heater water valve if one is fitted.

These things need checking before a cause can be established.

I am sometimes called upon to flush out a heater radiator. Sometimes it works and sometimes it doesn't and sometimes it causes a leak and the heater radiator must be replaced. Not an easy job on many vehicles made in the last couple of decades..

You got a bad heater door module most likely or the door itself may have issue.

Turn your air conditioner OFF and turn your heater ON. Air conditioners were designed to blow out one temperature of air... COLD.

Clogged heater hoses. Look for a clog where your heater hoses connect to your engine for corrosion. Especially down in engine part of connection and through any extension tubes.

if the car has been drained recently you might need to bleed your small rad in heater you call it your heater core sometimes get air locked or possibly your heater valve not turning on when you put on heat

Change thermostat if that doesn't solve the problem then its probaly a bad heater core

check your anti-freeze level, I'd bet that you're a little bit low!

it sounds like a bad blend door motor.these are controlled electrically and not with a cable like older vehicles did.

With the car warmed up,feel the heater hoses,are they both warm/hot near the firewall in the engine compartment?If they are both warm/hot,then the heater core should have circulation through it and it may be a "blend door" issue in the heater a/c assembly.If they are not warm/hot then the heater core could be dirty and plugged up and needs to be flushed.
If the above does not help,a drain and vacuum of the cooling system and vacuum refill will remove any trapped air.
Sometimes,clamping off the top rad hose and holding the engine rpm at 2000 rpm will force trapped air out of the heater core.(Watch temp gauge when trying this)
Lastly,a NEW thermostat doesn't mean its working correctly.