2003 chevy veture

I have 2003 chevy venture with heater problems. it will not blow no air out of the defrost vents very strong at all. the air is cold and i have istalld a new 195 desgree thermostat in it and it helped with the temp a little but not much i also replace the cabin filters but it dint help out much with the air flow out the vents. can someone help me with this please i have 5 children and there getting cold thanks for any inputt...

Are the radiator hoses getting hot?

Are BOTH of the heater hoses getting hot?

Is the heater core plugged up? - I would suspect this with dexcool, it can be flushed with a garden hose........

I would also ask what kind of heat you get out of the other vents in the system, such as the floor vents and the dash vents?

I only ask because the defrost vents (by the windshield) are just for that - defrosting the windshield. When you set the control settings to one of the defrost modes, that will also turn on the compressor, which also turns on the evaporator - the part that is really the air conditioner. The purpose of this is to remove the moisture from the air, which helps to defrost the windshield quickly.

If the engine is heating up normally (to about 190 degrees F), and you are getting flow through the heater core, then setting the heater controls to about 3/4 on the temperature control, and the air control to "split" (floor & dash), then you should be very warm and toasty in a few minutes.

If you Venture is like mine, you may notice that there is hot air outlets UNDER the front seats, so make sure you don't have anything blocking those outlets. This is where most of the heat comes from for the folks in the back of the van (the kids?).

Please let us know what you have going on there.

Take Care,

I start getting warm after about 10min of city driving.....