E-450 Stuck on Defrost Mode
I suddenly have cold air coming through defrost vents only, not through dash vents. Defective parts are buried behind firewall on engine side, not accessible without much complicated disassembly. A n...
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If you can find a mechanic with a smoke machine, they can hook it up and the smoke will reveal the location of the leak. They can connect it to the hose on the brake booster or other places will work also. Or you can try the poor man's smoke machine.Blow smoke from a big ol cigar and have someone watch under the dash while you watch the engine compartment.
