Question about 2002 Volvo S40

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A fan works wrong

When i start engine a fan starts as well even on 0 position of knob.
If the knob wiil be turn on any position air-con swichon as well

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  • 962 Answers

Check the Resistor component in between the wiring and the blower motor. it has a plug and it controls the blowers speed .

Posted on Feb 02, 2009

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Engine and AC fans start spinning


If that is the same thing as Defrost, the compressor will run even if the ac button is off. The compressor runs to dry the air blowing on the windshield.

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Mercedes clk55 engine suction fan stays on as soon as the key is turned on.The black and white wire on the fan has continous positive,when I remove relay P in the front fuse box (terminal 15) the fan


The fan control module is defective.....would scan codes in engine control module to insure this diagnosis is accurate. I've replaced quite a few on Mercedes Benz models. The reason for the scan of the engine control module is to insure the DME (engine control module is not commanding "ON" the engine cooling fan. The factory scan tool can view these commands. If the DME is not commanding the suction fan to operate...the fan module is indeed defective.

Scott, Porsche Master Tech 35 years.

Jan 12, 2014 | Cars & Trucks

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Overheating problem, what is the most probable cause?


You need to stop using it immediately before you
cause some damage or more than you may already have
That is just common sense. It should not overheat or
be any different than it was in the past without problem

The car has to be checked over/diagnosed,tested,etc for
various issues to resolve

Borrow or Rent a car until resolved

No way to guess at the problem

You should have some type of codes avail even
if the check light isn't on,you need professional help
to get a start on resolving

The timing belt maybe worn & jumped or the head gasket
bad.

Over heating isn't usually a cheap repair unless the thermostat
sticks partially closed

The RPM moves around the car is 11 years old,so it may just
need a though going over

Timing Belt,O2 Sensors,Exhaust Converter,Spark Plugs
and such

If you depend on a repair shop to do things & don't
have the knowledge to request work done throughout
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Sep 06, 2012 | 2002 Chevrolet Prizm

2 Answers

Lights on fan knob does not work


the bulbs are made into the a/c control head and are not replaceable. the only way to get them working again is to replace the hole assembly.

Aug 18, 2009 | 2004 Mazda 6

2 Answers

A/C will suddenly send out heat. Fiddling with knobs seems to help. What's wrong?


You have a broken wire connection between the temperature control knob and the circuit board behind the center dash console. Vibration causes the failure and once the control knob gets loose the solder connection fails.

For someone that knows how to remove the dash unit and can re-solder a couple of new wires this fix should take no more than 1 hour. Make sure that you apply loctite to the heat control knob spindle nut when you re-assemble it.

The dealer quoted me 750 dollars to fix this issue and I found out that it's a common failure for this year. I fixed mine virtually for free but it took some tools and about an hour of my time.

Jun 02, 2009 | 2005 Toyota Highlander

1 Answer

2000 Galant 3.0 V6 won't idle when warm


that weired they normaly die when the air con turnes on ummmmmmmmmmmmmm check the air filter

May 22, 2009 | 2000 Mitsubishi Galant

1 Answer

Overheating, not pulling from overflow??


Hi, i'm going to ask if you've checked the fan clutch? with the engine running, do you feel a strong wind flow coming from the fan when you stand near it? If the fan clutch is not engaging, and it will still spin and look as though it is working, but it has no force. This will cause the engine to overheat. another thing to check is whether the electric fan comes on when you put the air con on.

1. If you don't feel a strong blow of air coming from the engine bay when it is running and the hood open, then very carefully and slowly try and see if the fan clutch is working by using a broom handle to hold it still when the engine is running. If it is working well, it will kick the broom handle out of the way. If not, the fan will just stop spinning with the broom handle holding it.

2. turn air con off and run engine. check fan clutch. If fan clutch ok, then turn air con on and see if the electric fan is running as well. If electric fan is not running as soon as you put the air con on, then the supply to the fan is faulty. This could be a fuse, a bad connection, or even switch relay.

The engine fan cannot cool the engine sufficiently on its own with the air con on.

an easy way to get air out of the engine coolant system is to take the cap off, and turn the engine on. with the engine cool enough, you can carefully squeeze the top coolant hose to push out the air and this should make the cooland level drop. top up the coolant through the radiator cap - not the reserve/expansion tank. with the rad topped up to the brim, put the cap back on.

do these tests first. They're easy and will let you identify if the system is working. If these are working, and it's still overheating, then it could be the rad cap becoming faulty, or even if its a replacement cap, it's rated wrong for the lbs, and doesn't let the radiator breath and let the expanded hot coolant flow into the expansion tank. This will make the engine overheat and build up enough pressure so that the coolant gets kicked out of the engine via a hose, splitting the radiator, or eventually the head gasket. This type of fault usually occurs when you sit still at lights, or parked up with the engine running, and you then notice collant squirting out. Also, especially after you've ran the engine and stopped the engine running. The build up of pressure has no where to go so the hot coolant from the engine pushes the coolant out of the nearest hole it can find.

Still, something is making it run hot, it could be the clutch fan or coolant pump.

Good luck.

Apr 26, 2009 | 2005 Jeep Grand Cherokee

1 Answer

Air Con cuts in and out and so does cooling fan


I have a 2008.5 Mazda 3 GS Sport and when you turn the air flow selector to windows or windows/floor, the air condition will turn on automatically. (Can't turn it off.)

Nov 12, 2008 | 2008 Mazda Mazda3 Hatchback

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