Air con fan

DanL · Post by **DanL** » Tue Jul 12, 2011 6:00 pm

Hello all

Just had the air con topped up on the bongo(1995 2.5diesal 2WD), and they told me the fan wasnt working?? Did some invest myself. Check all fuses,relays all still no joy?? As ive never heard the fans on i decided to run it up to running temperture. As the temperture increased, still no Fans. As it passed normal operating temp on the Dashboard gauge(2 o'clock ish) the mason alarm started to go off. I then lost my bottle and stopped the engine. I have owned the Bongo for about a month now and have done around 400miles with no problems.

Just getting a bit paranoid the fans are fooked??

Any help will be greatly appriciated

Post by **g8dhe** » Tue Jul 12, 2011 8:46 pm

There are two fuses and three relays involved;

The relays are driven from signals from the ECU.

jaylee · Post by **jaylee** » Tue Jul 12, 2011 8:50 pm

OK, fan test... http://www.lushprojects.com/bongopartsm ... o=.html#11

If you disconnect the connector to sensor part 18-804C your rad fans should kick in?!
If you disconnect the connector to sensor part 18-845 & shorting the 2 points on the connector for a while should check yer scav fan (the one in the engine bay) works too...?

Though i would start by looking to see if the actual connectors to the fans are not corroded or broken??!

Cheers Geoff, i was hoping you would be along..!

DanL · Post by **DanL** » Tue Jul 12, 2011 9:01 pm

Thanks chaps!!

I will give it a try tomorrow.

jaylee · Post by **jaylee** » Tue Jul 12, 2011 9:18 pm

This could be of help to you too? 6th post down by Daveblueozzie... http://www.igmaynard.co.uk/bongo/forum/ ... ensor+test

To help with location of the rad fan sensor with pics.. Drivers side!

Also, running a salon style hair drier over the scav fan sensor & playing some heat, next to the handbrake pointing down into the engine bay will trigger it too! With just the "primary" ignition on..
(Scav fan triggered by excessive ambient heat in the engine bay, normally at a stand still?)

jaylee · Post by **jaylee** » Tue Jul 12, 2011 9:34 pm

DanL wrote:Hello all

Just had the air con topped up on the bongo(1995 2.5diesal 2WD), and they told me the fan wasnt working?? Did some invest myself. Check all fuses,relays all still no joy?? As ive never heard the fans on i decided to run it up to running temperture. As the temperture increased, still no Fans. As it passed normal operating temp on the Dashboard gauge(2 o'clock ish) the mason alarm started to go off. I then lost my bottle and stopped the engine. I have owned the Bongo for about a month now and have done around 400miles with no problems.

Just getting a bit paranoid the fans are fooked??

Any help will be greatly appriciated

I have a Mason fitted... What is yours set at?
Have you checked the coolant level in the header tank??

Northern Bongolow · Post by **Northern Bongolow** » Wed Jul 13, 2011 1:08 am

if your mason is set at 4.5 ish, and your system is health the fans should come on just before the bottom line of the H block.
or if you have a thermal digital gauge to point at the top hose outlet----96 deg c +/- a deg or 2.

find the fan switch (driverside above the starter motor on the head/rear,) if the end wobbles,its caput.
the grey plastic end becomes seperated from the brass body,this increases the resistance and the trigger point can vary to the point of not working at all.
new one from mazda £36.

DanL · Post by **DanL** » Wed Jul 13, 2011 8:52 am

Temp sensor discounected and both fans kick in, and Scav fan is working too. But still no fan when Air con is turned on?? Double checked all fuses and still no joy.

Any ideas fella's?

jaylee · Post by **jaylee** » Wed Jul 13, 2011 9:14 am

Good news so far... Starting to run out of ideas..! is it a manual heater/AC control system?

DanL · Post by **DanL** » Wed Jul 13, 2011 9:21 am

Its a manual system.

jaylee · Post by **jaylee** » Wed Jul 13, 2011 9:25 am

http://lushprojects.com/bongopartsmk2/c ... 02.html#25

Don't know if part 67-7403 has any bearing on this, but worth a check if haven't already??

321Away · Post by **321Away** » Wed Jul 13, 2011 9:27 am

does the aircon clutch/pump engage when you turn on the aircon?

Julian

DanL · Post by **DanL** » Wed Jul 13, 2011 9:31 am

Yeah air con is working fine, just over heats & cuts out when Bongo is stationary.

DanL · Post by **DanL** » Wed Jul 13, 2011 9:46 am

Jeylee!! Think you have hit the nail on the head!!!

Just found a relay burnt out! Its the foward R/H, as if your looking under the bonnet. What do they all do? And more importantly, where can i get one!!!!!!

321Away · Post by **321Away** » Wed Jul 13, 2011 9:51 am

you can swap them about, the fans are controlled by 2 of the relays, 1 brings them on low speed, the other to full speed. Err didnt your original post say you checked all the relays? lol

Julian

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