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Re: 94 bmw 318iC Heater not working
1st thing to check is the coolant level. Low coolant level results in no, or little heat (not enough coolant to circulate thru the heater core). What does your engine temp gauge indicate? (or is it just a warning light?) If the car is running at what appears to be lower than normal temp., u may have a thermostat that's stuck open. This would cause the engine to not reach operating temp, and u would not have heat. Check the above 2 items 1st, then let me know what u found. If that doesn't fix it, we will continue, let's do the easy and not too expensive stuff 1st!
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IT could be one of several things: possible the blower fan motor is bad; or the valve that lets the hot water in from the engine to the heater core is not opening; or the door that lets the air flow past the heater core and onward to your vents is not opening. All these are controlled by your heater switch, via relays and vacuum lines. If the blower motor works well when you put power to it directly, but not when it is hooked to the car, a connection in the switch or a relay may be bad. if you get little or no effort from the blower motor when you hook it directly to a good battery, it's the blower motor itself gone bad. If you get airflow but not heat, it's the device which diverts the hot water into the heater core. and if its the door to let air flow over the heater core, it could be a relay, a vacuum hose or the switch.
i see answers to other questions here except the question asked about no heat in a 325 xi 2001 blower works great fluid is full no leaks,fuses are fine,get a lil heat while at a stand still but as soon as you drive cold air only temp on max 91, engine temp right in the middle takes about 8 mins for temp gauge to reach the middle can anyone help with this..PLEASE !!!!!!
Go to the front power distribution box and check 30A fuse 20 (GRN/BRN wire) which feed power to the blower relay. When the ignition switch is in START or RUN position, the relay closes and power is fed to the final stage unit. Depending upon the state of the automatic climate control module, power output from the final stage module is applied to the blower motor. If checking all this does not solve the problem, you may have a clogged heater core
Let's start with the basics, check blower motor and AC fuses and relays, also take a visual check to the wiring going to the Blower Motor (Firewall, passenger side). Look for broken wires and loose electrical terminals.
Hi it sounds like either the thermostat or the heater matrix, although if there is air in the system then this would also cause this fault. get the thermostat checked first as this could cause more damage if not fixed quickly.
The heater matrix or heater core may be blocked or not circulating the warm air, This is a more expensive job if it will not unblock.
It sounds like your cabin air filter has stopped up common problem on these cars. You have to remove the glovebox to get to it. If this filter stops up, your fan will be running on high but hardly anything will come out of the vents.