posted by 3star on Oct 15, 2008
2004 reg Renault Clio Sport 2004 - Everything working fine until I stopped engine for about half hour on return found no demist or air con working. all front panel lights/systems operational and illuminated on the air con panel e.g. temp, fan intesity just no actual fan/demist/air movement. Checked all fuses marked with a fan symbol in passenger side fuse box - all ok and so are all underbonnet fuses. Guess its a fuse/relay/supply problem to the fan but can't find fault. Any advice appreciated please. Thank you, from Ian
Comment posted on Feb 25, 2009
It turned out to be the power control module - given these problems its likely to be either this power control module or the climate control computer. Some models have the resistor pack - this is in the fan housing but the power control module is in the air flow pipework between fan and cabin, after the filter. Its worth checking its faulty before buying as it cost £94 quid! All working fine now its replaced. Here's the fault find sequence:
check all fuses
ignition on is there 12v on track 4 of the power control module and on track 1of the blower motor?
yes go to *
no then check for 12v before ignition on track 30, an earth on track 85 and 12v after ignition on track 86 of cold air blower relay (yellow relay on an individual holder in engine compartment fuse box) - repair as necessary
check insulation, continuity and absencce of interference resistance on cold air delivery relay track 87 to track 4 of the power control module and and track 1 of the blower motor
if still no 12v supply on track 4 of the power module and track 1 of the blower motor - replace cold air delivery relay
*
check for earth on pin5 of power module (the pins are numbered 1-5) - repair if necessary
check insulation, continuity and absence of interfernce resistance of connection between track1 and track 2 of the blower motor - repair if necessary
disconnect the connector from the power control module and with ignition on shunt (short together) tracks1 and 5 - the fan should run at full speed - if not the fan is faulty
check the voltage between earth and track2 of the unit (with power module connected - this is tricky as there is a lot of insulation) it should vary as follows
speed 0 13.94v
speed 1 11.36v
speed 2 10.17v
speed 3 8.93v
speed 4 7.69v
speed 5 6.34v
speed 6 5.13v
speed 7 3.8v
speed 8 0.14v
if it does vary correctly (approx voltages) replace the power module - if not its the climate control computer
