Question about Mitsubishi MSH09TW Air Conditioner

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Blower fan will only work in low speed

I changed the battery to the remote and the high speed of the blower stayed the same... I did unplug the low voltage wiring to the board and the fan started blowing in high and after 5 seconds it turned off.. help please!!!

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Chandler Ede

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Sometimes after you replace the batteries in the remote, there is a communication disruption between the remote and the wall hung evaporator. With fresh batteries installed, take a paper clip and press in on the "reset" hole located on the remote. Yes you will have to reset the clock but it may help your situation. Then you will need to turn off both the inside unit as well as the outside unit. You must first turn back on the outside unit then the inside unit. If it continues as you have described, it could be a relay on the Main PC board and the board will need to be replaced. If all other functions and modes work, you will probably not have to replace the Receiver PC Board.

Posted on Sep 06, 2007

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I have an 05rendezvous,need to locate switches for cooling system,fans aren't co ming on & now I'm going to need a new radiator,cuz plastic broke.But it broke before fans gave out.Which I changed stat


The engine cooling fan system is controlled by the body control module (BCM) and the powertrain control module (PCM) or engine control module (ECM). The BCM performs the calculations as to how long, when and what speed the cooling fans should turn on. The BCM then sends a class 2 message to the PCM/ECM to engage the cooling fan relays. If there is a malfunction with the BCM, the PCM/ECM will control the engine cooling fans independently. The engine cooling system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the PCM/ECM to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood accessory wiring junction block. The ground path is provided at G100.
During low speed operation, the PCM/ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the cooling fan 1 relay coil, closes the relay contacts, and supplies battery positive voltage from the cool fan 1 fuse through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the cooling fan 2 relay and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the PCM/ECM supplies the ground path for the cooling fan 1 relay through the low speed cooling fan relay control circuit. After a 3 second delay, the PCM/ECM supplies a ground path for the cooling fan 3 or S/P relay and the cooling fan 2 relay through the high speed cooling fan relay control circuit. This energizes the cooling fan 2 relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the cooling fan 2 relay coil is energized closing the relay contacts and provides battery positive voltage from the cool fan 2 fuse on the cooling fan motor supply voltage circuit to the right 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.
The BCM and PCM/ECM command Low Speed Fans on under the following conditions:
?€¢
Engine coolant temperature exceeds approximately 106?°C (223?°F).


?€¢
A/C refrigerant pressure exceeds 1 310 kPa (190 psi).


?€¢
After the vehicle is shut off if the engine coolant temperature at key-off is greater than 140?°C (284?°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.

The BCM and PCM/ECM command High Speed Fans on under the following conditions:
?€¢
Engine coolant temperature reaches 110?°C (230?°F).


?€¢
A/C refrigerant pressure exceeds 1 655 kPa (240 psi).


?€¢
When certain DTCs set.


The three relays are located in the under hood fuse / relay box ! You need to have it checked for DTC'S -diagnostic trouble codes ! An you need a GM Tech 2 scan tool !
This diagnostic procedure supports the following DTCs:
?€¢
DTC P0480 Cooling Fan 1 Relay Control Circuit


?€¢
DTC P0481 Cooling Fan 2 and 3 or S/P Relay Control Circuit


?€¢
DTC P0691 Cooling Fan 1 Relay Control Circuit Low Voltage


?€¢
DTC P0692 Cooling Fan 1 Relay Control Circuit High Voltage


?€¢
DTC P0693 Cooling Fan 2 and 3 or S/P Relay Control Circuit Low Voltage


?€¢
DTC P0694 Cooling Fan 2 and 3 or S/P Relay Control Circuit High Voltage


  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the Fans Low Speed ON and OFF.
Do the low speed engine cooling fans turn ON and OFF with each command?
Go to Step 3
Go to Step 4

3

Important:: A 3 second delay occurs before the powertrain control module (PCM)/engine control module (ECM) changes the cooling fan speed.
With a scan tool, command the Fans High Speed ON and OFF.
Do the high speed engine cooling fans turn ON and OFF with each command?

Aug 08, 2015 | Cars & Trucks

1 Answer

Where is the radiator fan switch located on a 2002 oldsmobile intrigue


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 powertrain control module (PCM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood accessory wiring junction block. The ground path is provided at G113. The relays are located in the underhood fuse / relay box .
So ,what's the problem Paul , car overheating ? Fans not working ?
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 cooling fan 1 relay coil, closes the relay contacts, and supplies battery positive voltage from the cool fan 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 cooling fan 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 cooling fan 1 relay through the low speed cooling fan relay control circuit. After a 3-second delay, the PCM supplies a ground path for the cooling fan 2 relay and the cooling fan 3 relay through the high speed cooling fan relay control circuit. This energizes the cooling fan 2 relay coil, closes the relay contacts, and provides a ground path for the right cooling fan. At the same time the cooling fan 3 relay coil is energized closing the relay contacts and provides battery positive voltage from the cool fan 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.
The PCM commands Low Speed Fans on under the following conditions:
?€¢
Engine coolant temperature exceeds approximately 106?°C (223?°F).


?€¢
When the A/C is requested and the ambient temperature is more than 50?°C (122?°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 greater than 140?°C (284?°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.

The PCM commands High Speed Fans on under the following conditions:
?€¢
Engine coolant temperature reaches 110?°C (230?°F).


?€¢
A/C refrigerant pressure exceeds 1655 kPa (240 psi).


?€¢
When certain DTCs set.



So

May 11, 2015 | Oldsmobile Cars & Trucks

1 Answer

Fan motor is slowing down and not keeping the desired temperature


The circuit diagram for the standard control model shows the blower has a two-speed motor, connected directly to the power line in "Cool" mode, or connected to the temperature control in "Cook" mode. When the blower slows down during cooking, switch it temporarily to "Cool" mode. If it goes to normal speed, the problem is with the mode switch contacts or the wiring terminals between the fan mode switch and the temperature control board, or the control board itself.

If the speed does not change, check the wiring terminals at the speed switch common terminal (I assume your problem occurs in both low and high speeds). If you find tarnished, loose, or burned terminals, clean, repair or replace as needed. (In extreme cases, a loose terminal will cause the wire to overheat, damaging the insulation, oxidizing the terminal and causing a high-resistance condition that will reduce the voltage available to the motor.) If the connections are all good, the motor bearings are probably getting sticky at high temperatures. Let the oven get hot enough for the blower to slow down, then shut it off and check the blower bearings while wearing oven mitts.

May 12, 2014 | Southbend SLGS-22SC Gas Double Oven

1 Answer

In the heating mode, blower will not com on in auto but will come on in on mode at tstat


The furnace uses two different speeds. High for a/c (which is the "on" position of the fan switch) and low speed for heat. You could either have low speed of the blower not working or something wrong in the circuit board (if it has one). On the blower motor you may have several plugs that you could change the fan speed and your heat may start working. You will have to access the blower motor to find this out. Red color is low and black is high. Move the Red wire to another speed on the motor and see what happens.

Apr 14, 2011 | Heating & Cooling

1 Answer

How to change a heater relay fan runs only on high


If it runs on high then its not your relay. The relay feeds the blower motor voltage but dosn't control the fan speeds. There controled by reisitors on a small board in the housing for the motor and the AC unit on the fire wall . The circuit board is feed in most cases from wires that split from the motor feed wires and the board can easly be removed from the housing the board it not serivceable and would need to be replaced as a unit. However most of the time it will turn out to be a bad connection to the board at the connector and if you unplug and clean the contacts it will likely fix the problem

Jan 28, 2011 | 2000 Chevrolet Suburban

1 Answer

I want to change the blower speed


To change blower depends on Make of unit. Most of the time at the fan relay you will Red low Blue med Black high. Only one will be used theother taped off. Just unplug one plug the other one in. Some motros have speed taps on the motor you unplug one wire and plug into the speed you want. Rus

Dec 05, 2009 | Refrigerators

2 Answers

Hampton Bay Garrison 52" fan stuck on high


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Jun 15, 2009 | Hampton Bay 24750 Huntington III Ceiling...

1 Answer

No high speed on blower motor


if motor works on heat, but not on cool ,then the low speed is energized by the heat strip or control board .if the motor doesn't run in high on cool, then the fan relay or black high speed tap from the board is not being energized. usually its the fan relay ,which is only a factor in cool in high speed fan mode. try turning fan to on at stat. that energizes fan relay and blower should run in high. gently tap the side of the fan relay and see if fan comes on all of a sudden. if it does the relay is bad. change it wire for wire label all wires and use exact replacement relay unless you know how to read wiring diagram then you can use a 90-340 generic fits all replacement. trace motor power wires back to relay or control board to find where they are fed from.

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1 Answer

Reduce blower speed


Motor speeds on the blower are always remember black is high, blue in med. and red is low sometimes blowers are 4 speeds but the main colors are the black blue and red. Now where to change locate the wires coming from blower to a box or control board. control board has setting for heating and cooling speeds for the blower. You might see blue on heating which would be medium speed so take the red off park terminal and change places with the blue. Now if you have a fan control switch it looks like a dail in the middle of the furnace with numbers on the face with pointers set at the numbers. follow the wires from there to the electrical box and open box. find color of blower and switch be sure to cap off the wire you change. Wire nut would be good.

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1 Answer

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check for ground going to fan. If there is no ground replace a/c control panel located under radio it what you use to turn on the heater/ a/c

Jun 04, 2008 | 2000 Mercury Grand Marquis

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