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I need help with the heater in my 1989 Mazda b 2600. The heater is not blowing hot and cab is staying cold. If anybody can help with suggestions it would be great.
By jeff from Virginia Beach, VA
Check coolant level first, next choice is a stuck thermostat which would need to be replaced.
You need a new thermostat. My car was doing the same thing.
IF you see a sudden abrupt change in the engine temp, or if you check under the hood and BOTH the upper and lower radiator hose are not hot at operating temperature (if one is cold and one is hot) then your thermostat is not functioning.
However, sounds like the heater core...harder to get to and more expensive, unfortunately. I would make sure that I purchase the Haynes or Chilton's manual for your vehicle (around 12 dollars) and you can trouble shoot it yourself. Also, find your friendliest parts store like Napa and beg for help! Good Luck!
My heater blows hot air for 3 seconds then cold air, why? The blower works good and the AC works perfectly, but not my heater.
Check the hose connections in the engine to the heater, from the back of the dashboard, they may be loose.
Check the thermostat and does it have enough antifreeze/coolant?
My heater blows cold air on heat or AC.
We have had several questions on that. My suggestion was to blow out the system so there is no air.
That happened to me once and it was a faulty thermostat. Once the engine has heated the water enough, the thermostat should let the hot water circulate.