A/C PROBLEMS!!!

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May 26, 2017 | 08:09 PM

Dababy100

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A/C PROBLEMS!!!

I have an 89 bronco. A/C works but goes to defrost at 30+ mph then goes almost off after that till I slow way down then comes back on. Any help would be awesome. Also it has no overdrive switch in it. Is this normal?

May 26, 2017 | 10:08 PM

grumpin

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From: Oregon

I would check for a vacuum leak.

May 28, 2017 | 12:18 AM

Torky2

Fleet Mechanic

Joined: Sep 2003

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Quote:

Originally Posted by Dababy100

I have an 89 bronco............. Also it has no overdrive switch in it. Is this normal?

In 1989, the only Ford 4 speed automatic was the AOD, which was mechanically shifted, not electrically. No overdrive ON/OFF switch. To select non-overdrive operation, i.e., only gears 1-2-3, pick the proper DRIVE shift quadrant position for it. Same for allowing O/D (4th gear) operation. The "allow O/D operation" position usually is a "D" with an "O" around it. The non-overdrive position is just a "D".

Another possibility is that you have a 3-speed automatic, the C6. In which case the shift quadrant only has one "D" position.