Help please: 306 cooling fans failed
Discussion
Morning all.
One cooling fan on my trusty (100k & 7 years) `99 1.8GLX 306 stopped working a couple of years ago but it never stuggled with the remaining one so I left it. Now the second has stopped working, with the obvious result that it gets very hot, very quickly when stationary. Temp returns to normal when under way again and there are no leaks in the system, the waterpump was changed last year too.
Given the 2 yr gap between each fan stopping, am I right in thinking it`s probably the individual fans that have failed or do they have independant relay/switches that could also be the problem? All advice welcome please. Also, is GSF a recommended supplier of parts?
Thanks in advance.
Gary
One cooling fan on my trusty (100k & 7 years) `99 1.8GLX 306 stopped working a couple of years ago but it never stuggled with the remaining one so I left it. Now the second has stopped working, with the obvious result that it gets very hot, very quickly when stationary. Temp returns to normal when under way again and there are no leaks in the system, the waterpump was changed last year too.
Given the 2 yr gap between each fan stopping, am I right in thinking it`s probably the individual fans that have failed or do they have independant relay/switches that could also be the problem? All advice welcome please. Also, is GSF a recommended supplier of parts?
Thanks in advance.
Gary
Depends how they are set-up on a 306 but based on a 205...
Some cars have one fan with 2 speeds, some have 2 fans with 2 speeds.
One fan cars are very simple. One switch on the rad with three pins providing two turn on temps. lower temp turn on is routed via a big resistor (~20mm x 40mm ali cylinder) to provide slow speed, higher temp switch feeds direct to give high speed.
Common failures ona one fan set-up are failed low speed, caused by a buggered resistor, and total failure caused by a buggered switch. Failures of the fans themselves are rare.
Twin fan set-ups involve the same radiator switch but add three relays. Two fans run in series on the lower temp, in parallel on the higher temp. Again the radiator mounted thermo switch is a common failure but don't have much experience of other failures with this set-up.
On 205s dodgy wiring to the thermoswitch is also common but I'd hope that has been improved for the 306!
Some cars have one fan with 2 speeds, some have 2 fans with 2 speeds.
One fan cars are very simple. One switch on the rad with three pins providing two turn on temps. lower temp turn on is routed via a big resistor (~20mm x 40mm ali cylinder) to provide slow speed, higher temp switch feeds direct to give high speed.
Common failures ona one fan set-up are failed low speed, caused by a buggered resistor, and total failure caused by a buggered switch. Failures of the fans themselves are rare.
Twin fan set-ups involve the same radiator switch but add three relays. Two fans run in series on the lower temp, in parallel on the higher temp. Again the radiator mounted thermo switch is a common failure but don't have much experience of other failures with this set-up.
On 205s dodgy wiring to the thermoswitch is also common but I'd hope that has been improved for the 306!
Same engine as the xantia ,fans are controlled by a sensor on the thermostat housing.If you disconnect the sensor it makes the fans run (even with ignition off some times) .On the xantia there is a control unit called a bitron unit behind the nearside headlamp which controls the fans for when you have the aircon on, these fail regularly. There are also some relays between the two fans as well .On top of this the xantia fan motors are prone to fail and i'm guessing the fan motors are the same as the peugeot everything else is.
Hope this helps
Hope this helps
Update and thanks: Megamaniac, you were spot-on!
Pulling all 3 sensor connectors (I didn`t know which was the relevant one so just yanked the lot) off the thermostat housing didn`t have any effect on the fans. Having to dismiss the just-arrived Haynes manual`s "simply drain system, remove rad and fan assembly from above" procedure because they made no mention of the hard plumbed air-con matrix sandwiched between the two, there was lots of spannering on stuff that was in the way (front wheels, wheel arch splash guards, washer bottle, front bumper) to get access from the front instead. It was tight (proper mechanics would wince at my `muscle the lifted rad as far back as poss without breaking it to get mole grips and socket on the rear nuts` solution) but the two new GSF supplied fans are now humming, and while the bumper was off I got perfect access to fix the fog light and washer hose too.
Many thanks, job done.
Gary
Pulling all 3 sensor connectors (I didn`t know which was the relevant one so just yanked the lot) off the thermostat housing didn`t have any effect on the fans. Having to dismiss the just-arrived Haynes manual`s "simply drain system, remove rad and fan assembly from above" procedure because they made no mention of the hard plumbed air-con matrix sandwiched between the two, there was lots of spannering on stuff that was in the way (front wheels, wheel arch splash guards, washer bottle, front bumper) to get access from the front instead. It was tight (proper mechanics would wince at my `muscle the lifted rad as far back as poss without breaking it to get mole grips and socket on the rear nuts` solution) but the two new GSF supplied fans are now humming, and while the bumper was off I got perfect access to fix the fog light and washer hose too.
Many thanks, job done.
Gary
Gassing Station | French Bred | Top of Page | What's New | My Stuff