Question about 1999 Volkswagen Golf

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After the problem with my coolant sensor now it is my air con compressor which does not start when i put the AC on. The fan is working fine. What could it be?

1999 Golf 4 1.4 16v

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  • 293 Answers

Check the wiring to your coolant temperature sensor intended for the AC system. or replace the sensor.

Posted on Oct 29, 2012

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: AIR CONDITIONING

heater controls could be gone

Posted on Jul 06, 2008

  • 23 Answers

SOURCE: GOLF CAR 2007 PLUS

check fuses and relays. if everything ok, check to see if a/c clutch kicks on(hear a clicking sound from clutch) when ac activates

Posted on Jul 18, 2008

  • 11 Answers

SOURCE: please help me with my air conditioning for my 1995 jetta

HI, giving the compressor 12v directly is not the way to go as you are bypassing the entire fail safe cercuit. it seem to me that your ac gas is low(can be checked via ac pressure gauges) wich means you have a system leak sumwhere. as soon as your hi/low pressure switch(depending on system) detect inferior pressure to the spesified pressure ,the ac compressor voltage is cut in order to protect the pump from seizure.

Or perhaps your evaporator(small radiator like unit behind dash) can get freezed up caused by either too mutch system gas(check pressure) or poor opperation of the expantion valve. the evaporator then has a sensor(themometer) wich measures evap. temp and if the value drops below spec (usially round about7degrees) the ac compressor will be cut once again(fail safe)

Maybe your ac compressor overheats due to inferior system oil/oil capasity, also note that only some systems incorperate the function of measuring ac pump temp. then again temp to high= fail safe=no12v to ac pump.

Good luck.
gk

Posted on Jul 19, 2008

  • 2 Answers

SOURCE: vw golf 2001. coolant system not working

Your most probable cause for this is because your water valve needs replacement or repairing. Not all cars have a water valve that brings the heated coolant into the heater core unit.

Essentially, the heated coolant is brought from the engine block directly, into a mini radiator that has a fan to blow heated air into your vehicles cabin.

If that valve were clogged, or the switch itself to open up the water valve that blocks the coolant from going into the heater core unit, then you wont be able to get heat from the vents.

ALSO, another reason why your car might also be overheating as well, is you need to check your coolant levels as well to make sure it is fully filled up, if it is, then your thermostat might also need replacement.

good luck with your problem.

Posted on Apr 06, 2010

  • 4793 Answers

SOURCE: golf 2002 mark 4 tdi problem with engine / coolant

a common "fault"with all vw engines is the highest heater hose needs bled, to expell all air traped.also check the fan relay.as youve done the sensor thats about all .....

Posted on Aug 15, 2010

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1 Answer

How long for the ac fan to start working? Ive noticed that the fan does not work when i turn the ac on, can this cause my car to overheat. I check the temp and coolant liquid both seems fine.


the ac fan starts as soon as the ac is switched on
the fan is provide cooling of the condenser before the radiator to prevent high head pressures in the ac compressor
it is the fan at the front of the car mand does not affect engine temp
there is a radiator fan between the engine and the radiator that will not start until the coolant temperature reaches a set temp at which point the ECM switches that fan on
if that fan is not working when the engine is hot , check for fan, coolant temperature sensor switch , fan relay, fuses or problem ECM

Jan 13, 2016 | AC Cars & Trucks

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Ok I have replaced the therm,coolant temp sensor and replaced the 40amp fuse the keeps blowing,causing coolant fans to not work,causing overheatin. It does fine,fans work and no overheating until I turn on...


If the A/C is on the same circuit as the coolant fans, then the A/C motor is going bad and drawing too much current. A local shop should be able to test the motor for a small fee, or, if you know how to use a multimeter, you can check the motor's resistance for shorts. You'll need to know the original motor specs before testing; the motor model #, maker, etc., should be somewhere online, or available from the maker.

Jun 13, 2014 | Cars & Trucks

1 Answer

Car won't start after starting it with coolant temp sensor disconnected


Try a boost first before taking things apart,sound like low voltage.
Now about the fans.Sometimes it's easier (if the fans will work with voltage applied) just to install a relay and fire it off the switched power wire at the A/C compressor.Use this relay supply to voltage to the fans when the compressor runs.Want fans when not using A/C?Run a "in rad hose" temp switch and run that wire to the same relay to run fans when temp rises.Think after market hot rod stuff and keep it easy and simple,

Apr 10, 2017 | Cars & Trucks

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Coolant fans not working can overheats when driving slow


did you get any obd codes ?? well there is a possible the power relay or ac relay is not working.

Sep 24, 2012 | 1999 Pontiac Grand Am GT

1 Answer

Whenever I turned on the air condition in my Ford Explorer 2006, after few second the radiator Fan start running very frequently on high speed making noise. When the fan starts on high the rpm of the...


The cooling fan is supposed to come on when the /ac compressor clutch cycles on, and off when it cycles off.
The idle speed kicks up to compensate for the additional a/c compressor load and the additional alternator load. usually, just the low speed comes on until it hits a much higher temperature.

the system should cycle 4 to 7 times/minute at 79 degrees F.

Here are some things to consider:(The PCM (engine computer) is NEVER defective, don't replace it). I don't think it is the ECT (engine coolant temp sensor) or the Cylinder Head Temp Sensor. Or the VSS or the MAF sensors.


The electronically controlled fan clutch is controlled by the powertrain control module (PCM) based upon requests for airflow to cool the engine, transmission and A/C condenser. If no cooling is required, the electronics permit the fan to spin at a slower speed yielding improved fuel economy.
-------------------------------------------------------------------------------------------------------------------------------
Inoperative or damaged:
  • Electronically actuated fan clutch
  • Electronically actuated fan clutch controller
  • Wiring, connectors, relays or modules
  • Engine Coolant Temperature (ECT) sensor (4.0L SOHC)
  • Cylinder Head Temperature (CHT) sensor (4.6L [3V])
  • Mass Air Flow (MAF) sensor
  • Vehicle Speed Sensor (VSS)
  • ----------------------------------------------------------------------------
If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
Retrieve any DTC Codes (Diagnostic Test Code). Autozone will do for free.

--------------------------------------------------------------

The cooling fan clutch actuator valve controls the fluid flow from the reservoir into the working chamber. Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation.

The cooling fan clutch actuator valve is activated with a pulse width modulated (PWM) output signal from the powertrain control module (PCM). By opening and closing the fluid port valve, the PCM can control the cooling fan clutch speed. The cooling fan clutch speed is measured by a Hall-effect sensor and is monitored by the PCM during closed loop operation.

The PCM optimizes fan speed based on engine coolant temperature (ECT), engine oil temperature (EOT), transmission fluid temperature (TFT), intake air temperature (IAT), or air conditioning requirements. When an increased demand for fan speed is requested for vehicle cooling, the PCM monitors the fan speed through the Hall-effect sensor. If a fan speed increase is required, the PCM outputs the PWM signal to the fluid port, providing the required fan speed increase.

-----------------------------------------------------------------------------------


May 20, 2011 | 2006 Ford Explorer

1 Answer

My 93 pontiac grand am cooling fan won't turn on when the temperature reaches 220 degrees but if you unplug the coolant sensor the fan runs all the time, I've checked the relay and it is working fine what...


If the fans run when the sensor is unplugged there is nothing wrong with the relays. The computer automatically runs the fans when it recorded no info from the sensor to avoid overheating. The temp sensor is faulty. The ac compressor is not on the same circuit, it is not running because the sensor is unplugged and the computer is not able to determine coolant temp and disables the ac to avoid overheating.

Mar 11, 2011 | 1993 Pontiac Grand Am

1 Answer

The radiator electric fan works while a/c is on but it does not work in spite of the tempratur is so high and the fan cluch is ok


The electric fan should always come on when the AC is switched on, this is to ensure that the compressor cooler always has air being drawn though it. If the electric fan does not come on due to the high temperature of the engine coolant alone (AC off), then it is likely that a) the coolant sensor is faulty b ) the wiring to the sensor has either shorted out or come adrift.

Sep 08, 2010 | 2000 Isuzu Rodeo

1 Answer

Air con compressor not working i need to know


Do not play with this vehicle,if AC not working then take to a dealer or someone who understands jags ,these systems use a lot of complicated sensors and pressure detectors ,and they always leak gas and need rechecking once a year .The pipes go porous,the O ring seals play up and often the thing will just dump the gas out of the compressor for no obvious reason ,except to us that repair them ,its caused by the fan not coming on when the AC is turned on and it builds up too much pressure and ,this is caused when one of the these pressure sensors switches play up

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2004 reg Renault Clio Dynamique. Air con not working fans come on but only blows hot air out? just started all of a sudden. Any idea what this might be please? Thank you Maria


have you tried recharging your ac? you can buy freon from an auto parts store and have a mechanic put some freon in the air compressor

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1 Answer

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coolant temp sensor is probally faulty. I had a no fan blow problem, removed the wire harness from the coolant sensor and fan came on and stayed on, indicating that the fans work fine but not recieving singnal from sensor. replaced sensor, all worked out.

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