Astra Mk4 X18XE1 temp guage

tommychimp · 05-10-2008, 21:05

Got a wierd one here...

My temp guage sits on rock bottom whilst driving around, whether im giving it some stick or just driving normally. However, if I stop at lights or am in traffic then the guage climbs upto 90 and sits there quite happily but as soon as I move off then the guage starts to drop down to zero.

The fan does kick in and the heaters do get red hot.

Whats going on? Loose connection? Shonky sensor? Thermostat?

Jack · 05-10-2008, 21:06

Does the rad get completely hot? To the top?

Sounds like a dodgy sender or guage.

tommychimp · 05-10-2008, 21:09

Quote:

Originally Posted by Jack

Does the rad get completely hot? To the top?

Sounds like a dodgy sender or guage.

I haven't checked tbh, what are you getting at mate?

Jack · 05-10-2008, 21:48

Just wondering, that's all.

Unplug the sensor and connect the two pins together. Your guage should shoot round to maximum hotness. If it doesn't, it's not the sender.

Paul · 05-10-2008, 21:50

Quote:

Originally Posted by tommychimp

I haven't checked tbh, what are you getting at mate?

One isn't working

tommychimp · 06-10-2008, 17:59

Right bridged the connector the needle stayed put, but the fan kicked in.

However I left the engine ticking over and then the needle climbed up.

The rad does get hot all the way up too Jack!

Jack · 06-10-2008, 18:26

Quote:

Originally Posted by tommychimp

Right bridged the connector the needle stayed put, but the fan kicked in.

From which sensor?

I thought the temperature sensor for the fan was on the radiator itself?

I don't know if that's the same one that drives the guage though.

tommychimp · 06-10-2008, 19:43

Quote:

Originally Posted by Jack

From which sensor?

I thought the temperature sensor for the fan was on the radiator itself?

I don't know if that's the same one that drives the guage though.

Well the fan cut in when i unplugged the CTS (in the thermostat housing) and then turned off when i plugged it back in so im assuming the fan is controlled by that sensor. Im thinking the sensor controls the temp signal to the ECU, controlls the fan, and the guage. I'm no further forward now than when i started.

I can't seem to find anywhere on the engine a separate sensor for the temp guage.

Jack · 06-10-2008, 19:46

Ah, in that case, maybe the guage is driven by the sensor in the radiator.

I can't bloody remember.

tommychimp · 06-10-2008, 19:49

Quote:

Originally Posted by Jack

Ah, in that case, maybe the guage is driven by the sensor in the radiator.

I can't bloody remember.

Nope nor me. I'll have a poke around at the weekend when I've got some daylight.

Jack · 06-10-2008, 19:58

Bring it round and we'll have a mince with the Corsa too.

tommychimp · 06-10-2008, 20:22

Quote:

Originally Posted by Jack

Bring it round and we'll have a mince with the Corsa too.

Sunday guv?

Jack · 06-10-2008, 20:34

Winner.

I'll speak very nicely to The Management, we might be able to wang you some sunday dinner.

tommychimp · 06-10-2008, 20:35

Quote:

Originally Posted by Jack

Winner.

I'll speak very nicely to The Management, we might be able to wang you some sunday dinner.

Oooh ace

many thanks!

james sport · 07-10-2008, 20:14

I believe on the Mk4, they have replaced the separate engine management, temperature gauge and fan switch sensors with one sensor which feeds the ECU and then the ECU then drives the temp gauge and feeds the fan ECU.

tommychimp · 07-10-2008, 20:32

Quote:

Originally Posted by james sport

I believe on the Mk4, they have replaced the separate engine management, temperature gauge and fan switch sensors with one sensor which feeds the ECU and then the ECU then drives the temp gauge and feeds the fan ECU.

I that would make sense then... I'll pop in and get a new sensor tomorrow and give it a try, not too expensive are they

phazer · 07-10-2008, 20:33

As above - there is also some logic that lives in the dial unit IIRC