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Ac is not blowing out cold air. You have to put gages on the system and it shows its has freon.Checked all fuses and relays. The two fans in engingine compartment do not come on when the ac is turned on but does when the engine gets hot. The compressor engages when turned on also. If the magnetic clutch engages the compressor and still no cold air could be still low in freon or the HVAC unit.
Blower motor not working all the time...if I bang the dash near the glove box, it comes on then works great. Is this the switch assembly, the resistor problem, or should I be replacing the blower motor?
which fan? Interior fan, or radiator cooling fan? Is it the radiator cooling fan, or the fan controlled by the air-conditioning?
Run the vehicle, turn on and off the air-conditioning to identify which of the fans in the engine bay is the one triggered by the air-con and which is the primary cooling fan. If the primary cooling fan is permanently engaged, then first try replacing it's relay as it may have fused closed.
There is an electrically driven clutch on the front of the air conditioning compressor which engages when air conditioning is required The AC compressor has a fan belt driven wheel on the front of it. The belt turns this wheel all the time. When the a/c is off this wheel spins freely. When a/c is required the electrically driven clutch engages this spinning wheel to supply drive to the a/c compressor shaft. The 0645 code concerns a fault with this clutch.
The fan clutch can make a knocking noise when it tries to engage. At idle it will have a rhythm to it when it tries to engage. You will have an over heating condition and the air conditioning may not work properly.
The fix is to replace the fan clutch and reprogram the engine control module.
It is unlikely that the water pump is causing the trouble you describe. The large hex behind the fan is what you would turn to remove the fan clutch from the water pump shaft. This fan clutch is supposed to detect heated air coming through the AC condenser and radiator and engage the fan more positively with the water pump shaft when more air needs to me moved to cool the radiator and AC condenser. The fan clutch could be bad or the AC system may not be properly charged--either of these conditions could cause the problem you describe.
you mean it is not running, ok it will run the same time with the compressor, monitor if the compressor clutch engage while fan not ,check supply going to the fan if present. The fan is damaged and need to be repair.
U may be low in Freon gas. When Freon is low there's low pressure switch that will prevent A/C compressor clutch from engaging to protect it from failure. So, first check Freon pressure & any leaks form lines & hoses fittings. Even if the fan is working, that doesn’t indicate proper compressor OP'S. Look at the compressor front side you'll see the clutch stationary while the AFT pulley moving.
Then put air-condition compressor switch to ON (Engage), You should see the clutch engage & start rotate, If NOT, this is very clear indication u r low in Freon. Regards; MAR
There's a blower motor (fan) under the hood and up against the firewall near the center of the car that takes some work to remove. It has gone out in the last 2 of my 4 Cadillacs. Turns out if you're not real careful with the positioning of the spark plug wires they will brush up against it, and if one of them gets cracked or brittle it will "arc" and short out the blower motor. The a/c compressor should still come on (you'll hear a click when it engages) but you won't get any air blowing into the cabin, hot or cold.
The part was like $200 stock (year 2000 prices) and it took about an hour to remove it. My Caddy at that time had this damn strut bar going across the engine bay which we eventually removed to get to the blower motor.