Needs a new blower motor ,brushes worn by the sound of it
SOURCE: Heater only blows hot (well, warm) on full speed of fan
Replace the temp control on this car, it should be electrical control not cables.
SOURCE: Heater control illuminations aint working on a mk4
if you have recentley changed any of the above you will have probably knoked/disconnected the wires from the back of the unit, if not that you will have to replace the tiny little bulbs in each part of the unit. either way you will have to unscrew the unit and pull out as far as cables will allow. there should be a little connector on the top at the back which powers all electrical lighting in that unit.
SOURCE: 1997 audi A4 heater blowing cold air
You probably have a leak in your oil cooler. This is causing the oil to bleed into your cooling system causing the "thick brown liquid". This in turn will also cause your engine to over-heat since the cooling system is contaminated.
SOURCE: 97 blazer s 10 heater blower fan stops working
Blower motor is probably at the end of its life. I'll guess that it probably works best when it is cold, then when the weather, or the fan, is hot it quits working. Same issue with my cars when the fan got old and tired. Dealer can get you an expensive new one, auto parts store can get you a less expensive new one, or the salvage yard can get you a cheaper used one. I recommend www.car-parts.com to find a yard close to you with the part.
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