1990 Ford E150 Club Wagon 1/2 ton 5.0L I have a hose coming from the pump below the alternator and it is blowing out hot air while the vehicle is idling...where does this hose go to?

 

I hope I can explain this without boring you to death.
When the engine is cold, air from the air pump goes through a divert valve that directs the air through a check valve then to the exhaust manifolds. The check valve protects the air pump in case of backfire.
Once the engine warms up the valve diverts the air to the converter and no longer to the manifolds. There is also a check valve in that line to again protect the air pump.
There are a few temperature and vacuum switches that control these functions and no need to get involved in that now.(Referred to as TAD & TAB, thermal air divert and thermal air bypass)
Many times the check valves deteriorate and require replacement. Normally they are not too difficult to replace. If the hose in question happens to be attached to one of those check valves and it rusted out that may be where the hose came from.
If the vehicle is driven too long with a defective check valve it could ruin the divert valve also. I may have overlooked some details on this , but if I didn't answer your concern let me know.

 

you can be as technical as you like.....the better info the better understanding. The hose is attached to the bottom of the air/smog pump directly below the alternator. I think there are two hoses coming from the air/smog pump....but the one I'm referring to comes up the left side of the vehicle (standing in front of it, passenger side being left) close to the battery. My air cleaner housing unit has a piece missing that is attached to the left side of the housing unit and goes over the battery. a pic of the missing piece attached. I'm thinking that hose from the pump attaches to the hole in that duct on the picture. The only reason I'm not quite sure is that that hose blows out hot air while the van is running and I'm not familiar with the specifics dealing with vacuum, intake, exhaust and air issues. So, with that the question remains: where does the hose coming from the air/smog pump go to? If there are two hoses coming from the pump, where do they both go to? btw, when i performed an obd1 test it came back reading code 12....air control fault; previous to the hose issue I have been stumped with figuring out why the van dies while driving yet will restart after maybe 30 seconds to a minute or two

 

There is too much to get into here to provide all the info you would need to solve some of the problems with hose routing. All I can tell you is one the hoses goes from the air pump to the air by pass valve.
On the rear of the engine (doghouse removed) there is a bypass valve that has one large hose coming from the thermactor air pump to the valve. The output from the valve splits and one of the large hoses goes to a check valve over a piece of tubing that goes to the rear of both heads .
The other large hose at the bottom of the valve goes to the converter.
This goes back aways for me so bear with me.
Ford has so many different hose routings and set ups determined on whether the vehicle has an E4OD transmission, sequential fuel injection, Mass air flow sensor etc., It is difficult for me to recall all the variations.
I would sincerely suggest you get a good manual or another like vehicle to confirm correct hose routing.
You will definitely need to have some guidance on the operation of the Thermactor air solenoids in order to get the vehicle running right.
Those solenoids are controlled by the ECA.
As I stated, there is too much to cover here without a good reference manual if you're not familiar with the system.

 

If the ignition coil has never been replaced on that vehicle , give it some thought , they had many coil problems with the original coils. They opened up internally when they got hot!

 

The ignition coil, pick-up coil, rotor and dist cap as well as the plugs and wires will be my next job if the van doesn't run right after routing properly the hoses I mentioned. My van dies while driving. Once it dies I wait about 30 seconds to two minutes and start it back up and drive away. This happens off and on.....sometimes it won't happen for a week or two and then right back to the same problem. The first thing I replaced was the IAC which gave me better acceleration and wasn't cutting out on me. Then it started doing it again. I assumed it was the TP sensor and replaced that along with a couple other items that were suspect (eec relay, fuel pump relay, external fuel pump, fuel filter, egr position sensor, voltage regulator) yet still have the problem. But back to the hose routing issue, I followed the check valves and the metal lines and hoses attached to them from the back of the engine up to where they go and those weren't the hoses I mean; the hoses I'm referring to (2 of them) apparently go to the air housing assembly; one blows air and the other sucks air with the latter being attached to the air cleaner housing assembly. The other hose that is blowing air I think attaches to the air cleaner housing assembly as well in that hole on the picture I posted. But as I said I THINK it goes there. Problem with obtaining haynes or chilton books is that here in cincinnati no one sells them; at least not for a 90 ford e150....been to several autozones, smyths, advance autoparts, o'reilly.....none of them have it.

 

The one hose that sucks air goes to the air cleaner intake you showed.
It acts as a silencer to muffle the noise from the air pump.
The output hose has to go to the bypass valve to be directed where required. I have most of the info for this system , but it gets quite involved and I guarantee it will test your patience.

 

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