Your thermostat is stuck open.
It is possible the thermostat has stuck in the open position therefor not letting the engine heat up. It could also be the heater core or possibly the hoses to the heater core are disconnected.
A heater thermostat controls the temperature of water in a heating system. A heater thermostat can be purchased from companies such as Hygiene Supplies Direct and Alibaba.
Perhaps, but could also be: Low coolant? Bad thermostat? Heater core airbound, plugged? Heater temperature control cable frozen? Water pump not circulating coolant?
the thermostat used to control the heater and after we select the four pole switch to some number the thermostat start connect the power to the heater at the same time the heater start to heat and when we select the switch to zero position the heater not work
You prob have to replace the heater core
Someone turned up the thermostat, or the thermostat has failed. The thermostat tells the heater what temp to keep the water at.
no heat can be caused by,blocked heater core insufficient coolant in engine blocked heater hoses from engine to heater core bad heater thermostat bad thermostat in engine bad heater control switch
There may have been some water left in the heater core when you disconnected both hoses at the firewall. I can't think of any other explanation since there is no water circulating through the heater core.
Loosen the dash and pull out the complete heater box after you have disconnected the heater hose from the firewall...........
The temperature of the coolant entering the heater core is controlled by the engine thermostat. The engine coolant thermostat is generally located at the engine end of the upper radiator hose.
Check the thermostat.
No, BUT they do have an AQUA stat
heater not hot
What type of thermostat (there are several, the commonest is a rod)?
well no damage will really happen the thermostat allows the motor to get to a warm temp with out one the motor will (should) run slightly cooler but in the winter months the heater will not work very good.
Check the thermostat or heater core
Heater core could be clogged.
Heater works fine in my Wrangler! Check the thermostat or the hoses or heater core might be plugged. The thermostat is easiest ^ cheapest to change so start there.
Of course a water heater thermostat would be defective as water heaters / hydronic boilers would use an Aqua Stat
By overheating which will cause a change in the thermostat materials construction.
The circuit is open. Wires could be disconnected/damaged or the heater element is burned out.
could be thermostat or heater fan if you can hear all the speeds on the blower motor working then it could be your thermostat but your heater core might be plugged as well
Blocked heater core, faulty heater valve, disconnected connection to the heater valve.