2000 ford Windstar will not start in cold weather. Has no codes and it runs OK. Engine turns over OK.I have already checked the IAC.Any ideas?

see if this link helps you.
https://www.google.co.uk/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=2000+windstar+lx+won%27t+start+in+cold+weather

Take to autozone (or similar) and they will scan your van and print out the list of codes the computer has stored for free. Fix the error code(s) first and the hard starting will likely fix itself. Good luck.

1st have the engine control module scanned for fault codes and run a test called an engine running self test, next check the fuel pressure, it should be about 46 pounds under a load. If it low try replacing the fuel filter (located under the car on drivers side)

are there any codes

I think you need to study about:

Closed or Completed Circuits
Open Circuits
Short Circuits

NO ONE has any idea what a short circuit is

If you had one, you would have a blown
fuse or burned up something

Check for vacuum hoses off at the rear of the upper intake manifold. Also check the large black tube from the air filter housing to the throttle body.Make sure it's on and the clamps are tight, and any hoses to it are connected. Is the check engine light on? If so,you might think about taking it to your local repair shop (someone you trust) and scan the vehicle computer for trouble codes.

Sounds like you got a vacuum leak somewhere on that thing. Do you hear any hissing while its running. You can take some carb cleaner in aerosol can and spray it around the intake while its running to check for vacuum leaks. If it has one big enough the thing will change idle. Visually look for some sucked in vacuum lines on that thing. There is an IAC valve on top of the throttle body tap on it with a screwdriver and see if it idles. Lastly I hate to tell you those things were bad for upper plenum gasket leaks, you will need the upper plenum oring gaskets 6 I think, and the isolator bolts that hold it down, and 1 big upper plenum oring gasket. And the pcm will need a reflash when done should take care of the Check Engine Light.

try to get the codes we starring from this