Front fan blows on high at all times wont shut off , and fan wont blow at low speeds at all

Are the cooling fans coming on ? What relay switch did you replace ?
The BCM will request low speed cooling fan operation from the PCM under the following conditions:
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Engine coolant temperature exceeds approximately 103?°C (217?°F).

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When A/C is requested and the ambient temperature is more than 10?°C (50?°F).

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A/C refrigerant pressure exceeds 1310 kPa (190 psi).

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After the vehicle is shut off if the engine coolant temperature at key-off is more than 117?°C (243?°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.

The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the PCM to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the engine wiring harness junction block. The ground path is provided at G101.
During low speed operation, the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the FAN CONT #1 relay coil, closes the relay contacts, and supplies battery positive voltage from the FAN CONT #1 fuse through the cooling fan motor supply voltage circuit to the right cooling fan. The ground path for the right cooling fan is through the FAN CONT #2 relay and the left cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the PCM supplies the ground path for the FAN CONT #1 relay through the low speed cooling fan relay control circuit. After a 3-second delay, the PCM supplies a ground path for the FAN CONT #2 relay and the FAN CONT #3 relay through the high speed cooling fan relay control circuit. This energizes the FAN CONT #2 relay coil, closes the relay contacts, and provides a ground path for the right cooling fan. At the same time the FAN CONT #3 relay coil is energized closing the relay contacts and provides battery positive voltage from the FAN CONT #2 fuse on the cooling fan motor supply voltage circuit to the left cooling fan. During high speed fan operation, both engine cooling fans have there own ground path. The result is a parallel circuit with both fans running at high speed.
Is your vehicles check engine light lit ?
Is the

Sounds like high blower relay is bad

You either have a bad blower motor (probably) or something is rubbing the fan inside the housing.

When the blower works only on the high setting its usually a bad blower resistor which is right near the blower motor. now you say it would always blow high regardless of the fan speed setting that would indicate probably the climate control unit or a connector problem somewhere. finally it not working at all may be the climate control unit or connection went bad even further. it might have a blown fuse or a bad blower motor in addition to the climate control unit or connector problem .check for power and ground at the blower motor. the power is supplied from fuses and may have a relay also. the ground is supplied from the climate control unit and goes through the resistor to control the fan speed. good luck

Sounds like the coolant fan is not working properly on your vehicle, if you put the fan speed setting to its highest speed with the a/c on and the engine idling does the fans come on? If no you need the system to be tested for a bad switch, coolant fan relay, defective fan motor.
If the fan comes on only on high blow you will need the blower fan switch tested for a short or open in the low and mid range settings, if the coolant fan isn't coming on the condensor coils will overheat the a/c system causing excessive head pressure on the high side and causing the a/c unit to shut down and blow hot air.

Hello let me verify.
1 heater wont blow out warm air unless on high?
possible clogged airfilter.low on coolant or antifreeze.

2 heater wont blow any air unless on high?
Could be a bad switch low ane med do not work.

i have the same problem, my rear a/c blows great very cold, the front a/c blows but it is not cold at all. I had the the a/c seviced and it was vacumed and correct ammount put back in, no problems, the front still blows but it is not cold, i have checked everything and the a/c guy said it might be the door not opening. any help? still not working

YES THE AC SYSTEM IS LOW ON REFRIDERENT. U HAVE A LEAK SOMEWHERE.

Sounds like you need to replace the fan motor

if it doesnt work on all speed its the blower motor resistor that broken thanks pierre