93 3.0 Aerostar Help
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From: Acworth, GA
93 3.0 Aerostar Help
I have three problems with my Aerostar right now.
The first is that my Aerostar is idling too low and very rough, but I can't seem to find the idle adjust. Anyone have a picture of where it is?
The second is that all of the sudden, the air conditioning/heating system is wacking out. It blows out hot or cold air, but only from the defrost vents, none of the other vents blow out air. Anyone know what's going on?
Third, in looking for these problems, I found a vacuum hose that is just dangling in the engine bay (could be the cause of the first too). Anyone know where to find a vacuum diagram?
Any help would be appreciated.
The first is that my Aerostar is idling too low and very rough, but I can't seem to find the idle adjust. Anyone have a picture of where it is?
The second is that all of the sudden, the air conditioning/heating system is wacking out. It blows out hot or cold air, but only from the defrost vents, none of the other vents blow out air. Anyone know what's going on?
Third, in looking for these problems, I found a vacuum hose that is just dangling in the engine bay (could be the cause of the first too). Anyone know where to find a vacuum diagram?
Any help would be appreciated.
Elder User
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93 3.0 Aerostar Help
Do a search on (IAC) or idle air control valve, many aerostars have had this problem and it is a relatively cheap fix. My 93 3.0 has over 255k on it and that is the only engine problem I ever had. There are many posts just check this great website and I am certain you will find your answer. Iac seems to be the weak link in the motor department of 3.0's. Good luck
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Joined: May 2004
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From: connecticut
93 aerostar 3.0 xlt automatic
i hope i did this right but can figure out how to start new thread and need help depreatly my husband replaced the silenoid for the starter relay and forgot to write down the order that the wires go back on to it thier are 6 wires 1 is a small black wire and goes on the silver post but the other 5 go on the one of 2 gold colored posts some on one side and some on the other and i have no clue what order or what side they go on if anyone has a 93 aerostar can you Please just look under your hood and tell me what order they go in i tryed all the books but NONE tell you what order all they say in makesure you put them on in the right order- which is no help at all .
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agelder
As far as the heating and cooling system it sounds like you have a vacuum leak, the HVAC system works with a few vacuum motors to move the defrost panel/vent/floor doors, and it defaults to defrost when no vacuum is applied so that you can allways have the defrost running. As far as the idle problem there is a screw on the side of the throttle body that you can set idle with, but I'd probably try to fix the vacuum leak and maybe the iac before you do so otherwise you may just tune arround the actual problem. I'll try to scan some vacuum diagrams for you later today, if someone could just tell me how I can send them on this forum that is.
As far as the heating and cooling system it sounds like you have a vacuum leak, the HVAC system works with a few vacuum motors to move the defrost panel/vent/floor doors, and it defaults to defrost when no vacuum is applied so that you can allways have the defrost running. As far as the idle problem there is a screw on the side of the throttle body that you can set idle with, but I'd probably try to fix the vacuum leak and maybe the iac before you do so otherwise you may just tune arround the actual problem. I'll try to scan some vacuum diagrams for you later today, if someone could just tell me how I can send them on this forum that is.
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There are basic vacuum routing diagrams on the underside of the hood. Here is a link to the AutoZone Repair Guide section. You may have to scroll down to find the correct engine size.
On edit: That link did not work correctly. Just go to AutoZone's website (www.autozone.com) to the Repair section and click on the 'repair guide' link, the go to the 'Driveability and Emissions' section, and locate the Vacuum Diagram link there.
Hope this helps!
On edit: That link did not work correctly. Just go to AutoZone's website (www.autozone.com) to the Repair section and click on the 'repair guide' link, the go to the 'Driveability and Emissions' section, and locate the Vacuum Diagram link there.
Hope this helps!
Last edited by aerocolorado; May 7, 2004 at 04:59 PM.
Lead Driver
Joined: Sep 2003
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From: SoCal
A problem that happens a lot on mine is a back fire that occurs if I don't crank the engine enough to get it completely started. The backfire will usually blow off one or more of the plugs on the vacuum tree mounted on the back o fthe intake manifold. When that happens, the engine idles very poorly, and I usually get a Check Engine light at the same time. I've never let this go on for very long, so I have never seen what it does to vacuum operated accessories. But what jkorreck says makes sense; loss of vacuum will disable the HVAC routing controls, and defaulting it to defrost sounds like a safe mode of operation.
So pop open the engine cover and start looking for a vacuum port with no hose atteched to it. It will very likely be where that loose hose is supposed to plug to.
On my engine, I got a short length of rubber hose to replace two of the plugs on the vacuum tree. It fits very loosely on one end, but enough to make a seal with vacuum, so any excessive pressure will cause it to blow first. So if I ever have another mis-start that causes a back fire and subsequent rough idling, that's the first place I look.
So pop open the engine cover and start looking for a vacuum port with no hose atteched to it. It will very likely be where that loose hose is supposed to plug to.
On my engine, I got a short length of rubber hose to replace two of the plugs on the vacuum tree. It fits very loosely on one end, but enough to make a seal with vacuum, so any excessive pressure will cause it to blow first. So if I ever have another mis-start that causes a back fire and subsequent rough idling, that's the first place I look.
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AeroStarOwner
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May 9, 2012 11:01 AM
