I'm getting Heat out the side vents when I'm going uphill on passes, then on the downhill side getting cool air. A/C was just fixed and recharged, but now isn't coming on, was working good on the trip until the heat started coming out the side vents. Climate wheel was set low....outside temp was in the 80's. Could this be a monovale or some relay that has gone out?

It sounds like a vacuum leak. You loose vacuum when going uphill and the no-vacuum default (all actuators in their relaxed position) is heat and defrost on.

Happy hunting

__________________
5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots)
5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others)
5 speed '01 Jetta V6 (new wifes car, pretty quick)
5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k )
5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest)
0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it)

Thanks Jim! I'll have that checked out.

Check for bad vacuum line connectors in the area right around and above the brake booster. Often these get hard and brittle. If you need more line, take a piece to an autoparts store and match it up.

Keep us posted,

Haasman

__________________
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)