Gas dryers CLICK when the glowbar warms up the flame sensor to the point that the bimetal inside it bends. This insures the flame is lit. The flames stays on just long enough to warm the drum up to 160f. (for cotton) at which time the flame is shut down until the temp inside the drum drops to 105f when another blast of heat is applied by the control thermostat. If you hear the clicking then the ignitor is glowing AND the flame sensor is shutting it down. That means the thermal limit and control t-stat mounted on the blower housing is working. If that is the case then the coils are bad. Replace them.
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SOURCE: the dryer only blow out cold air.
I would start by checking the continuity of your thermal fuses on the unit. You will have at least one and they will be located around the heater element or ducting near the heater element. If they check out good, check to see if you have an open element.
SOURCE: DRYER BLOWING COLD AIR-NOT HEATING UP
i am sending you all the possibilities for your problem, check either of these causes ----and than let me know if it is solved----
Power from the house
Check to see whether there's power getting to the dryer. Is it plugged in? Check for blown fuses or tripped circuit breakers--your dryer uses two fuses or circuit breakers. The dryer could tumble but not heat if only one of the two fuses is blown. If you have circuit breakers, one of the two circuit breakers can trip, even if the two for the dryer are connected.
Heating element
Often a dryer heating element burns out, but doesn't trip the circuit breaker or blow a fuse. The heating element is simply a long coil of special wire. You can check it for continuity with an ohm meter. No continuity means the element is bad and you need to replace it--electric heating elements aren't repairable.
Thermal fuse
On many dryers, there's a thermal fuse mounted to the exhaust duct inside the back cover panel. The fuse--which is about an inch long--is usually embedded in black resin and mounted in a white plastic housing. If the fuse has blown, you need to replace it. (You can't re-set it.)
Wiring
A common problem is for the main wiring connection from the house, at the dryer, to burn and break its connection. Because the dryer can still tumble with partial power, the connection may be only partially defective. You may need to replace both the power cord to the dryer and the terminal block inside the dryer that the wire is attached to.
SOURCE: Running and blowing air but not heating
I think this will help
http://www.youtube.com/watch?v=HRKIU4LiS20&feature=related
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SOURCE: Dryer blowing cold air only
older homes with fuses can have to fuses on the dryer circut-1 could blow and the dryer would run without heat
SOURCE: my kenmore dryer is blowing out cold air
Make sure that both poles of your circuit are live - An electric dryer uses 220 volts to the heating element, but taps into only one pole (110 volt) for the motor that spins the drum. Check your circuit breaker to make sure that neither pole has tripped.
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