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I have a mistral MAS 101 a/c and fan speed seems to not change Is the fan had it

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Fans work but only after it gets warmer than it usually runs 2003 dodge caravan. The code is slow fan not working is there a separate fuse or switch?


DESCRIPTION The dual radiator fans are mounted to the back side of the radiator . The radiator fan consist of the fan blade, electric motor and a support shroud which are all serviced as an assembly.
OPERATION COOLANT TEMPERATURE
A/C PRESSURE TRANSAXLE OIL TEMPERATURE Fan Operation Speeds: Initial Max Initial Max Initial Max Fan On: 104°C (220°F) 110°C (230°F) Fan Speed Duty-Cycles (Ramps-up) from 30% to 99% 1,724 Kpa (250 psi) 2,068 Kpa (300 psi) Fan Speed Duty-Cycles (Ramps-up) from 30% to 99% 96°C (204°F) 111°C (232°F) Fan Speed Duty Cycles (Ramps-up) from 30% to 99% Fan Off: 101°C (214°F) Fan Speed Duty-Cycles (Ramps-down) from 99% to 30% 1,710 Kpa (248 psi) Fan Speed Duty-Cycles (Ramps-down) from 99% to 30% 89°C (192°F) Fan Speed Duty Cycles (Ramps-down) from 99% to 30%

Mar 08, 2018 | Dodge Cars & Trucks

1 Answer

I have a 2006 buick lucerne 3.8 v6 cxl.my coolinf fans dont come on .i need to know how to change the relay and the fuse.


Your vehicle cooling fan's are controlled by three relay's , couple of fuse's an the PCM - engine computer . The engine coolant temp. sensor is a input to the PCM , when engine temp get's to 212 the PCM will turn on the cooling fans in low speed . Checking to see what the actual temp is with a scan tool an a infrared thermometer at the thermostat housing ,an looking up the specification's in a service repair manual is how to diagnose . Not guessing an replacing parts . Plus learning how the cooling fan's work .
Relay Driven Dual Cooling Fan Diagnostics Reading factory service info as to how they work also would be a good idea .

Cooling Fan Control - Two Fan System
The engine cooling fan system consists of 2 puller type electrical cooling fans and 3 fan relays. The relays are arranged in a series parallel (S/P) configuration that allows the engine control module (ECM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block. The ground path is provided at G104.
During low speed operation, the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the low fan 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 S/P relay and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. After a 3 second delay, the ECM supplies a ground path for the high speed fan relay and the cooling fan S/P relay through the high speed cooling fan relay control circuit. This energizes the cooling fan S/P relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time, the high speed fan relay coil is energized closing the relay contacts, and provides battery positive voltage from the high fan fuse on the cooling fan motor supply voltage circuit, to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.
The ECM commands the low speed cooling fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 94.5°C (202°F).
• A/C refrigerant pressure exceeds 1447 kPa (210 psi).
• After the vehicle is shut OFF, if the engine coolant temperature at key-off is greater than 101°C (214°F), the low speed fans will run for a minimum of 60 seconds. After 60 seconds, if the coolant temperature drops below 101°C (214°F), the fans will shut OFF. The fans will automatically shut OFF after 3 minutes, regardless of coolant temperature.
The ECM commands the high speed fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 104.25°C (220°F).
• A/C refrigerant pressure exceeds approximately 1824 kPa (265 psi).
• When certain DTCs set
At idle and very low vehicle speeds the cooling fans are only allowed to increase in speed, if required. This ensures idle stability by preventing the fans from cycling between high and low speed.

Dec 10, 2017 | Buick Cars & Trucks

1 Answer

3 speed fan barely changes speed


You are talking about your blower fan for the air conditioner and heater right? More information will be needed to solve the problem.

When you say it barely changes speeds, does that mean it doesnt speed up, or doesnt slow down? By that I mean, is it "stuck" on low, or high?

Most blower fans run at different speeds through the use of a multi-stage resistor built into the fan switch circuit. Low speed is a high value resistor, medium speed is a low value one, and high speed is the fan running without any resistance.

If your fan is running on high and doesnt seem to want to run on lower speeds, the resistor pack may be failing. If the fan is running on low speed only, it may be that the fan itself is beginning to fail, or that the lubricant in it has gotten gummy.

Dec 07, 2015 | Cars & Trucks

1 Answer

Hi ,I have 1995 Mercury Mystique ,when I drive it on the high way and try to get up to the hill it starts to slow down and shaking and the enging speed goes high and sounds noisy then it retuns back to...


First, make sure your air filter is in good repair. If not, change it. (consider having a diagnostics test performed before you purcahse any "expensive" parts. Also, replace the fuel filter; if these do not make a difference, you may have a vacuum leak, so check all vacuum lines. Also consider replacing if necessary the EGR valve and the MAS (mass airflow sensor). Before replacing the MAS, purchase some cleaner for this (auto parts dealer will get it for you, and should have it in stock). The MAS is between the air filter housing and the throttle body (intake). Remove it and spray generously, then let air dry for fifteen minutes. Install and drive vehicle. If there are no changes, and you have replaced the EGR valve and the MAS, then you may have a (or more than one) plugged injector.
Please let me know if you need further assistance.
carsandcomps

Oct 28, 2011 | Cars & Trucks

1 Answer

Help!! my nissan mistral 1996 has suddenly started chug chugging has a loss of power and billowing out black smoke from the exhaust any idea why


sounds like the mass air sensore is going bad, or you have a crack in the tube going from the cleaner box to the MAS....this will cause the car to do wht you have explaned, But if it has a check engen light on Id double check and have it tested for free at autozone.

Dec 22, 2010 | Nissan Xterra Cars & Trucks

1 Answer

05 Silverado, overheats when in 4-wheel drive under strain. Fixed once(so I thought) by replacing the water pump and thermostat. Happened a few months later. Again, 4-wheel, under strain. Wound up...


Instrument cluster - GM had problems with a part inside the cluster , Stepper motor , These faulty step motors caused the gauges to act erratically . 2003 to 2006 ! ALL GM vehicles . Just replaced a cavalier instrument cluster for what customer thought was a over heating problem .The fans come on low speed when engine temp. reaches 220 degress
The PCM commands the low speed cooling fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 104.25°C (220°F).
• A/C refrigerant pressure exceeds 1447 kPa (210 psi).
• After the vehicle is shut OFF if the engine coolant temperature at key-off is greater than 101°C (214°F) the low speed fans will run for a minimum of 60 seconds After 60 seconds, if the coolant temperature drops below 101°C (214°F) the fans will shut OFF. The fans will automatically shut OFF after 3 min. regardless of coolant temperature.
The PCM commands the high speed fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 107.2°C (225°F).
• A/C refrigerant pressure exceeds approximately 1824 kPa (265 psi).
• When certain DTCs set.
At idle and very low vehicle speeds the cooling fans are only allowed to increase in speed if required. This insures idle stability by preventing the fans from cycling between high and low speed.

Mar 31, 2017 | 2005 Chevrolet Silverado

1 Answer

Po 101 and 300


To give you a little peace of mind, your engine is fine. I had the same problems with mine, and I totally forgot what they did to it and it was simple. I keep want to think it airmass sensor or throttle sensor its was one of those, they had the parts and seems like it took them 10minutes to replace and I was n and out. code 101 is airmass sensor and 300 is misfire the cause factor is from 101, you cant go faster than 40 to 50 mph even if you have the pedal to the floor..One of the mechanic state having Onstar system play a factor in it. Being electronics parts it may be still cover eventhough is 2003.

Aug 07, 2009 | 2003 Chevrolet Tahoe

2 Answers

Dashboard warning light


Check your mass air sensor MAS it may need cleaned or changed

Jul 20, 2009 | 2006 Fiat Strada

1 Answer

Car getting hot under load


Sounds like you need a fan clutch.

May 21, 2009 | 1994 Nissan Pathfinder

2 Answers

1999 SL1 running rough


I DONT KNOW FOR SURE BUT I WOULD REPLACE THE M.A.S. AND THE 02 SENSORS. (IF MONEY IS AN ISSUE TRY CLEANING THE M.A.S FIRST)

Aug 21, 2008 | 1999 Saturn SL

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