Yahoo Answers is shutting down on 4 May 2021 (Eastern Time) and the Yahoo Answers website is now in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
AC/Heater fan blows air even when turned off?
Hello. I have a 1999 Toyota Camry and the ac/heater still blows air when the knob is set to off. This usually happens when driving faster. The faster I drive, the more air it blows. Is that a big problem? Would I have to replace/fix anything? Help!!
2 Answers
- 8 years agoFavourite answer
Auto HVAC systems are purposely designed that way to reduce the chances of asphixiation (positive pressure in the passenger compartment is a good thing). The reasoing being that the driver could simply adjust the temperature control to get comfortable incoming air.
However, certain vehicles with fully MANUAL controls can shut off entry of outside air by sliding the intake control fully over to RECIRC. On these systems, nothing is required to be 'ON' in order to do that. I have a pickup truck that works that way.
Electric/vacuum controlled systems can be more restrictive often allowing recirculation only in combination with the blower fan and A/C compressor. This mode is often called A/C MAX.
Auto Temp systems with a seperate "Recirc" button still need to be "On" in order to function - again always turning the blower on, and also the A/C compressor if outside temp is above 32 degrees. On some well-designed systems you can then turn the A/C compressor off with yet another button, and reduce the blower speed to minimum. The old Chrysler Concorde worked that way.
- Anonymous8 years ago
Of course it blows air. The forward motion of your car is forcing outside air into the intake for your heating system.
