my heater on my aerostar it would seem so far has no heat and the high setting does not blow anything out of the vent on high. all other speeds and on just vent at high it blows air. any ideas. thanks

 

Let me see if I understand you. Your van never has any heat at any setting(vent,defrost or heat) and when you put the fan speed to high on any setting (vent, defrost, heat AC) the fan does not run but it runs on the lower speeds anytime?

 

it blows no heat no defrost at any speed. high will work on ac and on vent but not on high when trying to get heat threw forward vents. if that helps any.

 

I think I might be starting to understand. Let me try.

Turning the selector from A/C to Vent to Heat to Defrost will change the direction the air blows not the temp. A/C and vent will blow out of the front of the dash. Defrost blows up on the windshield and Heat blows down at your feet. These settings do not control whether the air is hot or cold (except A/C will chill the air).

Turning the temp control will control the temperature of the air but not the direction it blows. Even with the A/C on, if you slide it over to hot the air will be hot.

So, it is possible to get cold air at your feet in the heat position.

If you have rear A/C and heat, then there are other rules for that.

If this doesn't help, try stating what your control settings are and what you get.

 

ok no rear heat or ac. ok defrost on fan speed high heat all the way up . blows air but not hot. if i have everything the same but on any other fan speed no hot air just air. there is no heat on any setting or speed ok. and if i have the heat set just the heat . and the controls set to blow the heat out which there is none rember . out the vents like above the radio and by the doors on fan speed high it blows nothing out not even normal air. if i put it on any other setting like defrost or feet it blows air but no heat. now on A/C or vent it blows normal air anyway any setting this is with no heat just fresh air vent. or A/C which at this time does not work either . just blows normal air also. i hope i explained it better this time .

 

OK, I think we are getting there.

I may be a little confused by the terminalogy we are using. When you say "Heat", you mean the switch is set to the Heat position. When the switch is in heat the air will not come out the vents you mentioned. It blows out at the floor near you feet. The only time the air comes out of the vents is when the selector is in either the vent or A/C (or Max A/C) mode.

Your problem had to do with no hot air rather than the direction (I think). There are a few things that It could be. First, you may have a plugged heater core. Second, someone has disconnected the heater core because it leaked. Third, the temprature blend door is stuck in the cool position.

First, look to see that the heater hoses are connected to the heater core. This is under the hood on the passenger side (far left) going thru the firewall. If they are connected check to see if one or both get hot when the engine is running. If only one side gets hot the core is plugged. Checking for the blend door is a little more complicated. I had a problem with this on my old 91. An ink pen fell down the defroster and wedged aginst the blend door. I had to open the cover to the heater core to get access to it.

What year is you van? Did you just buy it? Did the problem just start or has it always been like this?

 

ok we are getting close. pretty much got it. yes i mean when switch is set to the heat postion. and yes it does not blow any heat on any fan speed setting. and yes on high there is no air moving at all. i will check those hoses for warmth today to see about the core. where is the heater core located at. i got this van last friday the 24th. it is a 90 and it might have always been like this. like a idiot i forgot to check this before i bought it. but for 400 dollars i could expect things like this.

 

Glad we are making progress

Do you hear the blower running when you are in heat mode?

Move the temp lever up and down and see if it moves freely. There is a cable attached to that lever and it moves the temprature blend door. It should move the full range but have some resistance as it moves the door. When I had my problem the lever would not go all the way. I can't remember if it was stuck open or closed.

Are you sure there is not air blowing out at the floor?

The heater core is located inside a box that sets behind the glove compartment. You actually get at it from below the glove compartment. It is easer to check the hoses from the engine compartment.

Open the hood and step to the left (passenger's side). All the way over next to the fender there should be two hoses that go through the firewall. These are the heater hoses. Check each one after the engine is warm They should both be hot. If not read this.

If the temp lever moves freely, the cable could have come off or it may have broken. To get to it you have to open the top of the dash. If I remember correctly you have to take the cover off of the instrument panel first. Remove some screws and the top panel will lift up. You can move the lever from hot to cold and see if the cable moves.

Again, check the hoses first then go from there. Also put the blower on high and move the other lever from Defrost to Heat to Vent to A/C and verify the blower runs in all positions and check again for the air at the floor when lever is at Heat.

 

ok i will check the hoses. there is air blowing on the floor just not on high on heat only . the blower is working any which way. even on high with it on heat its just that no air is coming out the vents don't know where its going but not out the vents.

 

both hoses are hot. i just got to thinking the old man i bought said when his daughter had it she took the dash apart to put in a new radio. and from the looks of things she had no clue what she was doing and took everything apart from the way things are put back together. i am begining to think she pinched something or messed something up when installing the radio. i for the first time don't ask me why i did not notice this before that the both levers do not go up either way also. both hose get hot but no heat in the inside and not much air flow at all.

 

At this point you should get either a Haynes or Chiltons manual. I've got both. It will give the step by step directions to check the cable that moves the blend door and to get at the heater core. It has pictures, that will help.

AutoZone carries Haynes. You can find them used on ebay too if you are not in a hurry. I just took a look at my Haynes manual. It appears that there are two cables. One adjusts the blend door that lets you adjust the amount of heat you will get. The other controls which outlet the air comes out of.

The manual gives directions to check and adjust the cables as well as replacing them. You will have to open the top of the dash to get at them.