We have replaced the radiator and the thermostat and still blows cold air. It will get a little warm when you just sit, but not a lot! when you start to go all cold air. Any suggestions on this problem?
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Put a piece of cardboard in front of the radiator. Only if it's cold out though, Usually in really cold weather, the cooling affect of the cold air circulating around the radiator keeps the fluid from getting hot enough to produce heat unless your running in park.
While it doesn't seem likely, if you've changed, or had the thermostat changed.... I'd say you got a faulty thermostat. I am curious as to what your temperature gauge says the temperature of the engine and coolant is.. If your gauge is showing hot, I can think of two more possibilities... the water pump isn't pumping right... and, if the water pump isn't working right, the problem can be a cracked head or block, which can cause an airlock in the coolant system. Check the coolant or radiator cap.
You need to fill your antifreeze with the truck running and your heat on. You leave off the radiator cap and let the truck warm up. The cap is left off to bleed air out of the system. Once the truck reaches temp for the thermostat to open, your fluid level should drop about 3/4 gallon. Give that a try and see what happens.
It is likely you have air in the system. Park on an incline, take the radiator cap off, start the car, let it warm up until the thermostat opens, fill the radiator until it stops going down. See if that doesn't get you some hot air. If not, try the other steps I have in my post athttp://www.fixya.com/cars/r6235876-no_heat_fan_blowing_cold_air .These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me.
The hoses from your heater core should be very hot to the touch. Check the hoses going to the core from the water pump. It should be very hot. The return hose should also be very hot. Now check the hoses going to the core. If they are not the same temp, then your heater control valve is not working correctly or the vacuum is not working. At any rate, locate the vacuum line going to the heater valve. Remove the silver bar on the valve from the plastic plunger arm. You will have heat all the time now if it was only a vacuum problem. You can fix it later when it's warmer out. BTW a 200* thermostat will make your heater even hotter.