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that means it is in the 'default' mode, so you have defrost capabilities-check first for a disconnected, very thin vacuum line-it will pass through the firewall on the passenger side to the top of the engine and may be disconnected, or have a crack or leak. If you find it and cannot see anything wrong with it, the next thing is usually the controller itself, which will require removing the surround panel around it and removing the screws that hold it into the dash. Check the harness and connector for loose fitting or possible damage. If you cannot find any obvious problem, chances are good that the controller itself is bad-the can usually be found on ebay for less than $50 including shipping. The most common issue is the vacuum line, so look carefully there first.
The fan probably has something touching the blades. It should occur when on high in heat mode also. Some object may have entered the system through the defrost vent on the dash. The fan motor may have to come off to get to the problem.
looked in my bible and i cannot find this number but the later models are all under the passenger side dash behind the glove box but some are showing in the middle of the bulkhead under the wiper mechanism ,hope this helps
check vacc line from engine into fire wall. behind batt is where they normally crack and leak. possible from a leaking batt at one time. check black supply vacc line right behind battery
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