Heat gauge goes way up,then by reeving motor it will go down.blows cold air

SOURCE: cold air blows out of heating system

might need a heater core

SOURCE: my 1995 ford areostar van when heat is on only blows cold air

The aerostar has a vacuum operated watervalve in the heater tubing.the valve is located on the
passenger side inner fender behind the aircleaner.with someone operating the controls inside the van
you can check to see if you get vaccum by removing the tiny hose that goes to the water valve
and checking for suction as you in the van person operates the heater conthttp://www.fixya.com/PostAnswer.aspx?thid=1323651&prdid=696348rols. If you have no
vaccum there is a break in the hose between the intake manifold and the valve. If you do get
vaccum check to see if the valve changes position from vaccum on to vaccum off. you can see
this motion on the small lever on the side of the valve. If the valve lever doesn't move you can
move it manually to allow the water to flow through the heater core. if the valve won't move manually
there is an obstruction in the valve. If it does move manually the vaccum diaphragm is gone.
replace the valve. if it moves to the manual open position you can hold it open with a tywrap.
before you get to this point you should first check to see that there is enough coolant in the
radiator. If you still have no heat you can check the coolant flow through the heater core. to do
this remove both heater hoses from the valve and pump water from a hose into one of the hoses
water should flow from the other hose. If it doesn't the heater core is blocked. The rear heater
operates the same way with the watervalve under the van just behind the drivers seat.
Good luck.

SOURCE: front heat works, but rear blows cold air only

With your front heat working the most likely cause for the rear heat not to work is that there is an obstruction in the line that is preventing the warm coolant to get to the rear heater core or the rear heater core itself is plugged and not circulating. Another possible cause could be low coolant level where the system has enough coolant to provide the front system with enought warm coolant but not the rear system. Hope this helps

SOURCE: 1987 ford ranger 2.3fi - My heater doesn't blow hot air.

Your thermostat may be stuck in a partially opened position. This would account for the low temp while driving.You can check it by removing it (it should be closed when at room temp, if it's not, it's defective) and dropping it into a pot of boiling water, it should open completely within a few seconds. Also make sure your coolant level is correct, and when idling, check to make sure the engine cooling fan is kicking on when the engine temp rises.

SOURCE: how to replace the blend motor/door on a 2003 ford

if the blend door motor is really problem warrenty time calls for 7 hours which means the whole dash comes out in