Heater could just be air bound and need to be bled It may have a bad heater control valve. If it has one, it will be located on one of the heater hoses by the firewall. Check the valve, and check the vacuum line going to the valve, as it may have rotted, and have come apart where it comes from the firewall, and to the valve. And also, the valve could be frozen in the closed position. If the Heater Control Valve is working-FEEL BOTH hoses-IF one is not HOT then U have a Blockage-Like a blocked heater Core.IF U put a Garden hose on one of the inlets U should have flow (both ways) check 4 a pinched or collapsed hose. If all The Previous items are checked it is possible , If the car is equipped with climate control that this portion of the system is At Fault, this was also a common problem with these cars as they aged.
check for air in the system vapor lock stinks but its not hard to fix
I have mercury marquis 2000 windshield wiper it works only on HI when i turn it low it doesnt work or lower than low stile doensnt work would you plz help me?
1983 doesnt have a crankshaft position sensor. you have an ignition module located on the side of the distributor.
change your thermostat....
it is most likely going to be your thermostat needs to be replaced. and if that doesnt work than time for a new radiator.
Check the fuse. If it has a manual OD switch to turn off and on be sure it is on.
It could be that your heater core is blocked or damaged somehow.
Replace the thermostat.
could be a sticking thermostat.
if the pump and thermostat have been replaced on a 2001 malibu and it overheats and the heat doesnt work now but the air does. do it need bleeding still , will air in the line still cause that problem...
Mercury does not have enough atmosphere and is too hot / cold to support life.
may be a bad thermostat