No heat I have a 96 Windstar.The problem is the van does not produce heat until the gas pedal is being pushed and when the pedal is released the heat inside drops to cool air.Does anyone have any suggestions?Thanx

Power brake booster!

Possibly an idle air motor for your idle problem or a vacuum hose off.

that could mean that your water pump impeller is broken. when you press the gas the remaining piece of the impeller is pushing the water and it actually makes it to the heater core. at idle it isn't spinning fast enough. ask a local autoparts store if the impeller is made of plastic.

1995 windstar., 3.8 eng. Cut off after being stop awhile , slow get up to speed, new & new plugs installed.

Maybe you didn't bleed all of the air out of your coolant systtem.
I had a very similar problem, last month, my heat would not go above 50 degrees F.

I had air in my heater core.

I put wheel blocks behind the back tires and engaged the emergancy brake.
I jacked the front of my van up so both tires were off the ground (about 3")
I removed the radiator cap, started the engine, and turned the heat on high.
I added antifreeze, until it was full.
I let the engine continue to run, as I watched the antifreeze level go back down, then I added more antifreeze.
After doing this 2 times, I squeezed and held the upper radiator hose. I did not release it.
I started pouring more antifreeze in and when it started to over-flow, I still kept pouring as slowly released the hose.
With the raditator level full, I replaced the cap and put some antifreeze in the coolant reservoir.
Lowered the front back to the ground and removed the tire blocks.
I stuck a guage in the inside vent and I now get a 125 degree reading.

Note...after I got the van jacked up, it only took me 15 minutes to get the air out of the system (mainly, because I squeezed and held the hose).

It may be due to plugs, fuel filter, fuel pump, or mass airflow sensor. Is your check engine light on?

Does van stay running when you hold the gas pedal down? Check fuel pressure at fuel rail should be 30 psi when key is turned on. EGR valve and EVP sensor also control idle.

You have a major brake fluid leak. The master cylinder, brake calipers, hose, steel lines or rear wheels cylinders are leaking. Not safe to drive until you repair it.

If there is white smoke coming out of tail pipe, the head gasket is blown. needs to be replaced.