SOURCE: Fully warmed up; blowing hot and cold; Suzuki XL-7
Its just a vent damper plate not operating, it's like a gate which controls the flow of air,,usually they are operated by vacuum, or cables.
Service center time, unless you are handy with your own repairs.
SOURCE: 2001 Suzuki XL-7. Heater blows hot one side, cold the other.
No ductwork [to the lower vents] under the dash. They are part of the heater core / blower housing is integrated (all one piece).
After reviewing shop manual, we suspect that one of the three damper flaps is not positioning correctly; or debris has blocked one side (which makes more sense given the symptoms).
We're waiting for the temperatures to get back in the plus numbers to check out the physical arrangement.
SOURCE: ac problem with 1999 mercury sable
most likely a broken blend door or blend door motor, the dash has to come out to replace this.hope this helps and good luck.
SOURCE: the heater does not blow hot air just cold air all
The first thing to check is the coolant (antifreeze) level in your radiator. If this level is too low it could cause your heater not to blow hot air. Check this when the engine is cold by removing the radiator cap. Do not remove the radiator cap when the engine is hot. If you do, you run the risk of getting scalded by hot water and steam that can shoot out the top of the radiator. The radiator should be completely full. If it's not, fill it up with a 50/50 solution of antifreeze and water. Also make sure the radiator overflow tank is filled up to the full mark. This is usually about halfway up the tank.
If your coolant level is ok I suspect you may need to replace the thermostat. It may be sticking shut and not letting hot water get to your heater core, or it may be sticking open and preventing your engine from reaching its normal hot operating temperature. A thermostat is relatively inexpensive and usually easy to replace. Just make sure you follow the instructions and put it in facing the right direction. If the thermostat is ok then you may have a blockage in your heater core. Replacing a heater core can be a difficult job on some car. If this is your problem I recommend taking the car into a garage to have the repair done. I hope this helps you out.
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