heat/air getting stuck
when I switch from heat to air, or air to heat, it's getting stuck and when it does
switch I hear a thump down in the firewall area
Possible sticking servo motor or the blend air door is binding on something, eventually it will quit working all together. If you have the digital readout then you can check the codes for a failed or servo overrun.
The mechanism does wear out. Possible vacuum leak too.
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