THE BLOCK HEATER IS A HEATING ELEMENT THAT IS LOCATED INSIDE ONE OF YOUR ENGINE BLOCKS FROST PLUGS. ALL VEHICLES THAT HAVE A BLOCK HEATER HAVE A REGULAR ELECTRICAL CORD THAT PLUGS INTO A WALL SOCKET USUALL INSIDE YOUR GARAGE OVERNIGHT SO THAT THE ENGINE COOLANT CAN BE HEATED SO THAT WHEN INCLEMENT WEATHER COMES YOU DONT HAVE TO WAIT TILL YOUR CAR RUNS FOR A WHILE BEFORE GETTING ANY HEAT. NO YOUR THERMOSTAT DOES NOT NEED TO BE CHANGED. IF NOT SURE YOU CAN ALWAYS SWITCH TO AN ALL SEASON THERMOSTAT.
If your heater does not work on your 94 Mazda Protege, check the thermostat. You can also check the heater fuse to ensure it has not blown.
sounds like you need a new heater matrix.
On a 1998 B 4000, it is in the housing at the attachment of the upper heater hose.
Low coolant? Defective thermostat? Heater core plugged, restricted, or air bound Water pump not circulating coolant?
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Possibly low coolant level or blown heater core.....also check thermostat CHECK COOLANT LEVEL FIRST. IF FULL THEN MOST LIKLY YOU NEED A THERMOSTAT.
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Check your coolant level first. Post your findings.AnswerHeather core could be blocked or bad thermostat. I have owned a 1990 for 7 years and my mom owns a 1992 (7 years too) and I just purchased a 1994 and every one of them have no heat. I gets warm in the winter but not hot.I have changed the thermostat many times, flushed the rad, mom changed the heater core but we still have no heat.I don't no if it's just the MPV or just our vans.