Question about 2004 Chrysler Pacifica

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

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Temp sensors or stuck relay pull the relay and swap with another the same see if it stops pull the temp sensor connector off should stop as will default to -30 C

Posted on Jun 06, 2010

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Posted on Jan 02, 2017

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2004 Chevy Monte Carlo 3.4 the a/c stopped blowing,then it started overheating to the red within a couple miles,replaced the thermostat,the relay switch some days it overheats sometimes it runs fine


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:
?€¢
Engine coolant temperature exceeds approximately 103?°C (217?°F).


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


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


?€¢
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

Jul 10, 2015 | Cars & Trucks

1 Answer

In cold temp,heater motor do not run


you mean low heat. at all ducts with full fan speed and blows hard,
here is the correct order.
1: engine at 180F or more holding, a absolute must.
2: fan runs at full speed on HIGH, (sounds like it)
3: fan actual blows (felt) at full speed, to any vent, try all vents.
4: now heat, will happen, if not, the dampers are closed or wrong.
damper can be complex on newer cars,they have motor controlled damper servos';

is this just blower fan dead? problem. on high, if yes say so.

Jan 26, 2014 | 2008 Suzuki Grand Vitara

1 Answer

Why wont my a/c or heater fan come on?


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

Oct 30, 2011 | 1997 Lincoln Continental

2 Answers

OVERHEATING 2001 EXPLORER SPORT


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.

Jul 15, 2010 | 2003 Ford Explorer

1 Answer

My heater won't blow out any air unless it is on high with the fan blowing.


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.

Jan 14, 2010 | 2005 Jeep Grand Cherokee

3 Answers

99' Escalade a/c front vent blows cool air an rear blow cold air.


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

Jul 13, 2009 | 1999 Cadillac Escalade

2 Answers

Rad fan fuse blows out when low speed fan kicks on...


Sounds like you need to replace the fan motor

Jun 25, 2009 | 2006 Chrysler Sebring

2 Answers

Does ac blower have a fan relay ? It doent blow ******* max


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

Jul 30, 2008 | 1979 Pontiac Firebird

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