2003 winstar no heat

Check the heater hoses for warmth at the heater core. Some designs do not use a waterflow valve, but instead always have heater core flow and use the air flaps to regulate heat.

Now there is a difference in some thermostats and the housings. Barely noticeable are the locking tabs inside the housing and on the thermostat ring. If you have this setup and the thermostat is not locked in place, you could get some bypass around the thermostat.

If you have an electric cooling fan, the Relay may be stuck, keeping the electric cooling fan running when it should not. This would overcool the engine.

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The Engine Temp. sensor is bad. it is under the intake manifold. if there is a miss also check under the coils over the spark plugs. If there is Coolant in the spark plug holes .then the intake gasket is leaking. The intake manifold needs to come off to change the coolant sensor. When off look for corrosion on the cylinder head at the coolant port. If there is corrsion then the cylinder head must be replaced.

Most likely the blend door actuator. Do you hear clicking behind the dash? If so that's the problem. Excellent video on youtube goes throught the whole process, about 30- 40 mins to fix.

maybe there is a crack in the hose and air is getting in and heats up the water and anti freeze you should buy a new radiator hose that should fix the problem

check your water pump out it might still be working but not hard not enough to circulate and coolant to keep engine cool. Or If you had your engine flushed you might want to change the thermostat. hope this helps you out good luck

Potential causes: Low coolant- fix by adding coolant Thermostat stuck closed- would also cause engine to overheat Thermostat stuck open- would eventually blow at least luke warm air Heater core plugged- Get it backflushed or replace it These are the most common causes

THERE IS A DAMPER THAT IS NOT OPENING TO THE HEATER CORE TO LET THE HEAT IN THIS DAMPER SHOULD BE UNDER THE DASH ON THE PASSENGER SIDE

due to some reasons the rim is out of shape. so change the rim and then try using the brakes

When engine running, ensure no engine combustion gas bubbles in coolant resevoir (if so, the head gasket is blown).

Check cooling fans are operating ok (when required when car warms up), if not check
1) fuse,
2) relay operation,
3) heat sensor switch.

Replace thermostat.
When re-filling cooling system, bleed off any airlock as necessary.

Check for collapsing (soft) coolant hose on suction side of waterpump when engine revs above idle.

Since you added coolant, now it is time to check the fans. If the fans do come on, than your thermostat needs to be replaced, Should be done every 4 years anyways.