Technical head gasket

[spanner]

well thats it ,
Head gasket is gone.Prts are ordered now i need to sort fan.Temp warnind light doesnt work on turning the key but if i go and pull single wire from sensor in the back of the head driver side and short it out the light illuminates so the bulb is working. Dissconnected plug from sensor on side of radiator shorted it but fan still doesnt turn.The fan is a replacement not long in and it worked fine on bench test before fitting.can someone tell me what these sensors are known as I thought rad one was coolent temp and head one would have been switch sender.Need ideas on direction of the feed ,ie does coolent temp then go to head sensor which then lights warning light and then powers the fan or what.


Cheers:bang:

 

[rallycinq]

Radiator fan sensor switch is just that, a switch. Its two pole, power in and power out to the fan. Check the earth to the fan, lay in an additional earth, just as a trial but be prepared to leave it there.

The coolant light switch switches to earth. You know the earth is OK, because you've earthed the wire against the block. It has a supply that just needs the earth to complete the circuit. It gets that when the switch 'switches'

Cheers

D

 

[fingers99]

This is an SPI, right?

Then, the one in the rad is the thermostatic radiator switch, the one in the head is the coolant temp sensor. PM Fluffy on ClubCento.

Get the head skimmed or the gasket will go again almost immediately.

 

[spanner]

does this mean there basically two seperate circuits then excessive heat in head trips the light,excessive rad temp cuts fan and the two run seperate or is there a link ith the lot.Temp light deffo lights on start up?

 

[spanner]

Fingers not sure on spi think so air box looks like square box to me but it is black

 

[fingers99]

If it's only got one injector, or the air box isn't enormous and round, it's SPI. See here.

The circuits are effectively seperate, which is why Kripit was so puzzled about both faults occuring at the same time.

 

[spanner]

Cheers fingers you are the man Deffo top pic I now know its spi,also glad to know its seperate circuits this narrows the head scratching.Temp sensor is £39 so i want to make sure it isnt working.You think the fact it oesnt light on start up that this sensor is scrap or does something else tell it its warm

 

[fingers99]

They don't usually go, so might be worthwhile popping into a scrappy. Failing that, if you can pop a meter on resistance to it, pull it off and dangle it in a pan of water that you're slowly bringing to the boil...............