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Re: no heat just cold air how do i fix this
There are several things it could be as you didn't give enough detail.
The water hoses to the heater core or the heater core itself may be plugged
The accessory relay that is turned on by the ignition switch may not be passing power on to the heater system-get the wiring diagram and trace the power with a VOM or tracer light. There is also a fusable link that is between the battery and the power to the accessory relay that may be blown and blocking the power..
The control valve that permits hot water to go from the engine to the heater core may not be energized or opening-or plugged.
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#1 Listen if you hear the blend door flap open and close if you do then working good.
#2 run car to normal temp and touch both heater hoses and make sure temp is similar if one is hot and the other warm then your heater core is clogged and most likely that can be the problem it build lime from having tap or well water in coolant system distilled water is recommended but who uses that.
#3 run car when cold with cap off @ 2k rpm and top off radiator. Then close cap and continue to rev @2k until normal temp if heater hoses are not equal in temp heater core clogged.
If the engine is heating properly you most likeliy have a clogged heating coil or regulator (opens to allow hot water to flow thru the heater core. No hot water to the heater cord, not heat in the vehicle. Good luck
If the engine temp gauge reads like normal, then you either have a bad heater core, or the valve that feeds the engine coolant to the heater core is stuck shut. If the temp gauge seems to be on the cold side, or fluctuates from normal to cooler than normal and back, it may be your thermostat is stuck open.
There are several reasons for no heat. 1st, how is the temp gauge in the car? Is it in the normal range, or is it running cold or hot after warming up? How long does it take to warm up? 1st check the coolant level, make sure it is at the correct level, bleed system to remove any air (bleeder bolt usually located near the thermostat housing.) If that checks out ok, and the engine is not warming up, change the thermostat. If you still have a problem, the heater core may be plugged up with rust and sediment. Flushing the system may help to restore the flow of coolant to get the heat going again. Worst case scenario, system plugged beyond flushing out the crud, heater core would have to be replaced. Start with the easy stuff 1st, hopefully that will work. Good luck
Could be a blocked heater core (the part inside the dash that the hot water runs thru), or the heater blend door motor not operating (the part that allows the air from the heater into the vents), or a broken blend door shaft, or something similar. Most of these would require a workshop to attend to them, although you could try flushing out the heater core, by removing those hoses you spoke about from the pipes they go onto at the firewall and directing water at a reasonable pressure (not high pressure like a steam cleaner) into one of the pipes to see if you get a whole lot of crud come out. This may or may not fix the problem and I recammend you take it to a garage and if cost is an issue just tell them you want it diagnosed, and to advise on a price to repair. Give them an upper limit on what you expect to pay for diagnosis as well.
Put your hand on the heater hoses as close to the fire wall as possible find out if both hoses are hot.Do this when the vehicle is cold allow car to heat up with heater open and running.If both equaly hot then heater core at fault.If different check water supply to cold hose.