>i have a 1994 aerostaR v 6 3.0 i noticed when im driving the temp is >fine but when i stop it starts getting really hot (at idle) no leaks >that i can see anywhere . so i changed the thermostat still the same >also the heater controls are not working it only works on defrost no >vents it has vaccuum controls. after i put the new thermostat in i was >not able to get any heat inside the vehicle just cold air . and yes >im sure i put the thermostat in the right way . any suggestions other >than that this van has been a great runner If you are SURE the stat is OK (you tested it in a pan of water?) then the next bet is the FAN CLUTCH, they pack in after about 85K Clive

It sounds like a water pump may be possible. The impellers may be corroded and not effectively moving water in your system, especially at slow speeds. Are you running any antifreeze other than standard Prestone or Peak? If you've been running anything that says DexCool on the jug or says anything about OAT inhibiters on the small print, drain that stuff and replace it now. That stuff eats the impellers right off your water pump. GM's had a bunch of lawsuits over that garbage. The PO of my Aerostar ran that stuff, and it did exactly that. - AC

It dosn't do much for water jackets either from what I hear from other people.