I have a 2003 Ford Explorer. The heating and ac work fine but the air flow has dropped off over time. I've cleaned the air intake but the problem still exists. It acts like there is a clogged filter. I noticed that the blower is located behind the glove compartment and it has a plastic box between the inlet and the blower. Could this contain a filter?
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Check out the heater hoses for warmth. Both should be the same with the water flowing. If they are not, the water is not circulating.
There are 2 ways the heater can work. One style varies the amount of water flow to control the heat levels. The other uses the blend flaps in the ducts to push air flow around the heater core.
If the heater hoses are not circulating water, a part called a flow valve is to blame. Check out the autoparts sites for photos of the flow valve for your car. If you have the blend flap system, a solenoid called a "motor" is not changing the position of the blend flap in the dashes' ductwork.
You cant clean this sensor and make it work....Once it is bad it is useless...
It is designed to sense air flow only. Once you put any type of cleaner on it it will just make it worse and the PCM wont read it at all due to further contamination...I know that they are expensive...The cheapest way to get one is from a junk yard.I have done this before with sensors...As long as it is the same engine and air flow system it will work.....If you can find same truck as yours that has been wrecked you can take the one off of it and install your sensor on the wrecked truck...I am a certified truck tech.and I look for stuff all the time....If you will mail me back with engine size I will find you one very cheap...hope i can help you metalpoet
A leaking A/C unit tends to get grimy, decreasing air flow. Have your refrigerant pressure checked, If it is low, have the mechanic open up the HVAC system and clean the grime off the AC condenser with some solvent, or do an expensive A/C repair. Also of note: Some 2002 SL models were equipped with cabin air filters. If you have one, get it replaced.