When in defrost mode my air condioner and electric fan motor comes on and off in about 1 min. time. I can here a rely cut in and out. whats gong on !!!

Fan relay is bad. There is one for temperature and one for air condioner. The temperature switch could be at fault also.

check under the hood and locate your vacuum lines going in and out of the fire wall, a number of times, vacuum lines can crack and sometimes cracked lines can seal, or leak.

could be a bad fan motor or fan relay is bad also

I doubt if you have a fan problem. More than likely you have a bad actutor motor. There are 2 small electric actuator motors under the dash. The temperture door actuator moves the air temperature door, which controls the temperature of the air coming from either the a/c or heater vents. The mode actuator (which is probably the one you hear clicking) controls the mode of operation, or more simply, which vents the air will be coming out of. When the internal gears of the mode actuator fail and start slipping, they make a loud repetative "clicking" sound, which is what you are hearing. Another symptom that may or may not accompany this situation is a longer than usual wait time for your mode selection to occur. So to sum up, a loud repetative clicking sound from the center of the dashboard possibly accompanied by a longer than usual wait time for your ac,heat or defrost mode to occur, usually indicates a failing mode door actuator.

I think you may find these two articles helpful in finding out about your problem.

Where's The Fuse?

What Else Could Be Wrong?

Then I will say that if the blower motor will not run on any of the speeds, the MOST LIKELY cause would be the blower motor itself, or a bad/burned electrical connector at the motor, or both.

Could be faulting acutar motor for the hot air door. (1) Heater Core Cover (2) Heater Core (3) A/C Defroster Seal (4) Upper HVAC Module Case (5) Dash Seal (6) A/C Valve (7) Heater/Defroster Valve (8) Temperature Valve (9) A/C Valve Lever (10) Mode Valve Actuator (11) Heater/Defroster Valve Lever (12) Mode Valve Cam (13) Lower HVAC Module Case (14) Rear Heater Duct Seal (15) Temperature Valve Actuator Screw (16) Temperature Valve Actuator (17) HVAC Module Wiring Harness (18) Blower Motor Resistor/Relay Assembly (19) Blower Motor Acoustic Insulator (20) Blower Motor (21) Blower Motor Fan (22) Passenger Compartment Air Filter Access Door (23) Dash Seal (24) Evaporator Block Seal (25) Evaporator Core (26) Passenger Compartment Air Filters (27) Air Inlet Valve (28) Air Inlet Housing (29) Air Inlet Housing Seal (30) Air Inlet Actuator (31) Heater Core Pipe Seal

go to the blower motor under the dash passger side turn the air on see if it has power at the plug with a test light if no power check the fuse if power replace the blower motor

All cars are designed with a blower fan motor that pushes air through the ventilation system. This air is processed by a series of vents to direct the air to various positions. Example: heater, air conditioner and defrost modes. Most blower motors are power by a basic electrical circuit that utilizes a multi resistor or a solid-state resistor to control different fan speed modes (low, medium low, medium and high). If the resistor malfunctions it may lose one or more of the lower fan speed settings.
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We have heard that complaint before, and it was the ac clutch cycling under the hood. It does sound like it is coming from the dash. The next time it is making the noise, open the hood and inspect the front of the compressor. It may be stopping and starting. The only other cause could be a mode actuator for the ac/heating system. Your vehicle has electric motors that move the air to defrost, floor, inside or out, etc. One of those actuators could be malfunctioning, but they usually just stop working. I would check the compressor first. It may just need additional freon. Hope this helps

Check the following fuses:
10 amp GAUGE under the dash, and the 40 amp HEATER under the hood.
If both fuses are good, I suspect that you may either have a bad fan switch or a bad heater fan motor. The switches are rare to fail, I would suspect the heater motor first. Please try this: Turn the key on; turn the fan switch to high. Look under & behind the glovebox, for the bottom of the heater fan motor. Round thing with 3 screws holding it to the heater box. Using a small hammer, or something that you can tap with, tap on the bottom of the heater fan motor. You just may jar the motor enough to make it run. If it comes back on, you may need to replace it at some point in the near future. Worked for me quite a few times. Try that, repost to me what happens. Hope this helps.