You need a mode actuator !!
SOURCE: 1997 audi A4 heater blowing cold air
You will have to change the heater core. 9 out of 10 times, when the heater is not heating the air, it is a bad heater core.
SOURCE: air conditioner blows hot air from dash
On most cars when you push a button or slide a lever to change your choice of location where you want the air to blow out louvers move inside the dash to redirect the air to your chosen location. When you switch from heat to AC other louvers move. These louvers are often powered by vacuum lines running from the engine. If one of these louvers is stuck or if you have a vacuum leak in one of the lines it may be causing your problem.
SOURCE: 2004 toyota sienna a/c not working one side cold other side warm
there are two a/c lines that run down the fire wall under the van to the rear.right around the bottom of the fire wall the is a connection point on both lines. you will find a leak there .replace the orings and recharge system. also you will need two specail toyota tools to release the couplings.i have done this repair on several sienna's. let me know if this helps.
SOURCE: heater blows cold air
Check there is water in it first. A black cap on top of the radiator. If the level is ok then a wee red dipstick should float up.
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