Symptoms:
The car runs fine, the aircon works great but occasionally the temp gauge suddenly trips off the scale and it tells me to stop. I ignore this and it goes away after a minute or so, and may not show again for a couple of days.
However using the Delphi diag it throws the P0483 cooling fault after a few minutes of clear codes.
Having activated Regeneration a few times it will do the revving smoothly up to 3800 and back down but always says the process failed. I assume that's because of this fault code that keeps recurring.
It was missing slightly at the top of the revs but this has been cured with the new crank sensor I expect.
Having replaced the coolant sensor I was surprised to still have a fault.
Turns out the slow speed fan does not actuate but the high speed does.
This proves that the fan works and that there is connectivity between fan and ECU I imagine.
The fan works well with the AC on.
So I think it's down to the relay for slow and fast running which I removed and inspected. Connections are clean and shiny . No connectivity between the two large connectors but I'm assuming they need to be switched on by the relay.
So I really don't know how to test that unit? There was some connectivity between some of the 4 small connectors but I'm shooting in the dark.
Hints please?
Is it serviceable or should I just get a new one and try it? I see it has tiny little screws holding it together. Is it worth opening up for a look?
Thanks.
The car runs fine, the aircon works great but occasionally the temp gauge suddenly trips off the scale and it tells me to stop. I ignore this and it goes away after a minute or so, and may not show again for a couple of days.
However using the Delphi diag it throws the P0483 cooling fault after a few minutes of clear codes.
Having activated Regeneration a few times it will do the revving smoothly up to 3800 and back down but always says the process failed. I assume that's because of this fault code that keeps recurring.
It was missing slightly at the top of the revs but this has been cured with the new crank sensor I expect.
Having replaced the coolant sensor I was surprised to still have a fault.
Turns out the slow speed fan does not actuate but the high speed does.
This proves that the fan works and that there is connectivity between fan and ECU I imagine.
The fan works well with the AC on.
So I think it's down to the relay for slow and fast running which I removed and inspected. Connections are clean and shiny . No connectivity between the two large connectors but I'm assuming they need to be switched on by the relay.
So I really don't know how to test that unit? There was some connectivity between some of the 4 small connectors but I'm shooting in the dark.
Hints please?
Is it serviceable or should I just get a new one and try it? I see it has tiny little screws holding it together. Is it worth opening up for a look?
Thanks.