2004 grand marquis blowing cool air cant get hot air why?
Check the horn - if it doesn't blow, then you may have found the culprit. In most cars, the lighter and horn are on the same circuit.
replace heater core and or themostat Coolant level may be low not allowing hot coolant to circulate properly, check coolant level.
Fuse is blown.
Take the car to a service center which is equipped for this. You must be careful how much you put in or you will blow the system...........Then you pay.
Most likely the bad news that you did not want to hear. The heater core is leaking coolant.
You got a short somewhere. Might be in the wiring, might be in the element itself. Either that, or you're overloading it.
Check to insure that the engine coolant is full and the thermostat is not stuck. Without the heated fluid from the engine the heater will always blow cold air.
possibly blown head gasket
If this is the case, try disconnecting the ac compressor. If not that, it could be in the 'master switch' (turn signal lever unit). Does anything else go out along with the turn signals? Does it only happen when you turn on the heater or ac?
Short in the wiring or a bad horn switch.
There is an over current condition. You could have swore shorted to ground or a failing a c clutch.
your heater core hoses could be plugged up and not letting much hot anti-freeze into the heater core then when you try to blow alot of air through it it cools the warm air off too much and you get not so warm air. try a cooling sytem flush
heat core. leak. thermostat. no antifreeze.
You have a vacuum source at the intake manifold that is possibly disconnected.
Grand - 1990 Blow Off 1-13 was released on: USA: 12 April 1990
You blow it up
Have to first remove all the light bulbs, then put in a fresh fuse, if it still blows, then you will have to follow all the wires to find the short. If the fuse does not blow, then the problem is with either the bulb or the socket.
Either you need to pen your vents or there is some vent obstruction.
It's really easy the switch is in the steering colume.
It could be the thermostat on the engine. If the engine does not warm up adequately the heater will never blow hot air.
You can't goodbye