How do you get your Mazda b2200 heater to work again new radiatot water pump hoses ac works fine just no heat?

Answer 1

First did you get all the air in the system out?It is pretty easy to do just leave the radiator cap OFF and let it idle for at least 15-20 minutes and placing some cardboard in front of the radiator speeds up the process,also have the heat on the hot setting,fan speed high.Now if no change I would suggest replacing the thermostat and gasket which is attached at the upper radiator hose and you will have to drain down the coolant not necessarily all of it to do this.Just repeat the process above and if still no heat your heater core may be the problem.A simple way to see if it is even warming up is to touch the core on the drivers side inside the cab above the accelerator just to check.I would bet the heater core is fine,if you had normal heat before the work you stated above.I have owned my bseries for 23 years and know this truck and did in jan2010 replace my radiator,heater core,timing belt,waterpump etc.The radiator,and heater core were the original and just had poor circulation due to age,corrosion. Note with the radiator cap off it may splurge some coolant over after about 10 minutes(normally) have some rags to catch this and then install rad cap and let if continue to idle for another 10 minutes you should have good heat.I suggest buying a stant,or other brand vent lever style radiator cap,this allows you to pull the lever up relieves the pressure so you can take the cap off with the radiator hot.Great investfest for 5-7 bux, I have one myself.