Air conditioner is blowing cold air then turn to hot air. After car is turned off for a while it blows cold air again. Just had heater core and thermostat replaced recently

Search Results

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

www.hyundaiforum.com > ... > Vehicle Line Up > Hyundai Tucson
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 ...

www.denlorstools.com/autoblog/.../car-heater-blows-cold-auto-service-ti...
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 ...

repairpal.com > Problems > Buick > LeSabre
... 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,

What have you checked so far ?
Radiator full of coolant ? Heater hoses getting hot ?

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

Usually a sign of a faulty blend door under the dash.
The blend doors direct air thru the ac and heater core along with the upper and lower vents.

Behind the temp panel the wires or hoses are back words

If you are absolutely confident the AC compressor is not kicking out on low pressure then it is the blend door actuator.

The blend door determines how much air blows through the heater core or evaporator.

The actuator can be purchased at dealer and maybe at a local part store.

Your heater core may be clogged

heater core is going bad my dodge ram truck did the same thing for about three months then steam startedcoming out of the vents it was antifreeze i have not fixed it yet i just bypassed it for now cause its hot and i have to take the dash completly out to get to it, and yes my airconditioner was blowing out hot now immediatly after i bypassed it blows cold again.you have to find where it goes into the motor on both sides so follow the hoses from firewall then buy a 3ft hose to go from one side of motor to the other problem fixed! well that is you wont have a heater until you change the heater core

Does the car run cold or is the temp. correct. Check the thermostat first. check that the radiator and res. is full. Check the hoses to and from the heater core. If one is hot and one is cold then either the shut-off valve to the heater core is defective or the heater core is plugged.

Hi!
It appears we have an Air lock scenario and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.

Please press the Blue button to appraise my FREE Efforts, Thank You!
Paul 'W' U.K