Thread: Cooling System Sanity Check

Maybe change the thermostat and see if that fixes the problem like it did for BadCo.
Before chasing down a sender.



The temperature sender part number is AYG 9603 (Which seems like a Landrover number, not an Isuzu one)

which is odd as I can't find that number on any supplier sites (lrdirect.com etc)
Maybe you have to get it from Land Rover themselves.

Found this ancient thread from Bearman
http://www.aulro.com/afvb/isuzu-land...re-sensor.html

That number, PRC2506, does come up, but I really don't know that it's the right one for a Perentie.

Originally Posted by Chris078

Maybe change the thermostat and see if that fixes the problem like it did for BadCo.
Before chasing down a sender.



The temperature sender part number is AYG 9603 (Which seems like a Landrover number, not an Isuzu one)

which is odd as I can't find that number on any supplier sites (lrdirect.com etc)
Maybe you have to get it from Land Rover themselves.

Found this ancient thread from Bearman
http://www.aulro.com/afvb/isuzu-land...re-sensor.html

That number, PRC2506, does come up, but I really don't know that it's the right one for a Perentie.

It's not Chris, that's for a V8 petrol 3.5L. The AYG 9603 is the correct one for a perentie - it's actually a VDO sender as the perenties have VDO gauges but of course allocated an AYG number by LR so they can triple the price

Thanks Bearman. I had no idea where he got that number from, that's why I mentioned that it may not be correct.

If AYG9603 is a VDO part, one assumes that a VDO stockist will be able to supply it at 1/4 the LR cost?!


Well now, out of interest (and I have a day off today) I rang Land Rover here in Brisbane.
The genuine part AYG9603 is $38.75 inc GST! I'm getting one to throw in the spares box.
The part is in Melbourne, should be here tomorrow for me.

Originally Posted by Chris078

I suppose if you're just idling it wouldn't get there. If you're driving it, It should get to full temp, just take an extra few minutes.

That is just my personal opinion. I could very well be wrong.

I disagree. But i could also be wrong!

If the thermostat is always open then there is nothing controlling the temperature. Its always going to be the coldest it can be.

We need someone who actually knows what they are talking about haha

Originally Posted by BadCo.

I disagree. But i could also be wrong!

If the thermostat is always open then there is nothing controlling the temperature. Its always going to be the coldest it can be.

We need someone who actually knows what they are talking about haha

lol. I was thinking that because the temperature that it sits it when fully heated (88c or so) is above the opening temp for the thermostat (82), that it would still get to that 'heated' temp, it would just take longer to get there.

Originally Posted by BadCo.

I disagree. But i could also be wrong!

If the thermostat is always open then there is nothing controlling the temperature. Its always going to be the coldest it can be.

We need someone who actually knows what they are talking about haha

There is a hysteresis in the opening of a thermostat. It never fully opens for normal operation. It should only fully open when the ambient is really hot. The thermostat is there to regulate the flow rate in the cooling system, keeping the coolant warm in cold ambient and cool in hot ambient. If the thermostat opens early, the motor will always be cooler than it should be.
Let's face it, if there wasn't a problem with the motor being as cool as it can be, why have a thermostat?
I had a Gemini years ago. The thermostat failed closed. To get around whilst I waited for the parts to arrive, I removed the thermostat. The temperature needle never moved from the bottom stop and the automatic choke was on all the time. The car was running quite rich.

Originally Posted by Chris078

Thanks Bearman. I had no idea where he got that number from, that's why I mentioned that it may not be correct.

If AYG9603 is a VDO part, one assumes that a VDO stockist will be able to supply it at 1/4 the LR cost?!


Well now, out of interest (and I have a day off today) I rang Land Rover here in Brisbane.
The genuine part AYG9603 is $38.75 inc GST! I'm getting one to throw in the spares box.
The part is in Melbourne, should be here tomorrow for me.

Let us know if it has a VDO part number!

Originally Posted by BadCo.

Let us know if it has a VDO part number!

I can! This is the VDO number that the Land Rover guy gave me

It's 6685-66-095-8448 - for the temp sender