My lincon is bloweing nothing but hot air what could be roung

Check your coolant level. If there is no water or coolant in the reservoir or radiator, there is nothing to get hot! So therefore, you will get no hot air blowing into cab. Also could be stuck thermostat in the open position.

take look here... Lots of good helpful information.
http://astrosafarivans.org/bb2/viewforum.php?f=54

does the air blow in when the car is not moving. if it does, your heater switch is on and blowing hot air in through the bottom vent.

Could be an air lock in the hot water system.
Normal procedure is to slacken a hose clip at the highest point and bleed the air out.
Don't try this when the engine is hot or someone could get scalded. Surprised the dealer didn't bleed the system as they would have a special radiator cap that allows the system to be put under pressure

Check our answers on the 2000 LS,same problem. don-ohio (:^)

often on the vans with rear air the air dor acuator goed bad and can no longer switch from hot to cold. also the swich itself will often go bad. this can be caused by sticky fingers damaging the inside of the switch. sometimes a good cleaning in warm water will fix a sticky switch

expanson valve needs to be changed...also check condensor

Maybe your heater is working at the same time. An open heater valve can cause this. Maybe there is a leak in the vacuum that pull the heater valve diaphram close.

you may have a leak in your system or the ac condensor could be bad.

put some frion in and change out the antifreeze

On the bottom of the air unit is the lever that changes temps. It likes to fall out of place.I propped mine back with a piece of half-inch copper pipe a couple of years ago.Remove glove box then panel on front side of console to access.