Temp Gauge Goes To Max Then Normal

[Greenman]

Hi guys fantastic forum. Just used it to help change my aux water pump as that was not working.

Now when I turn my ignition on the temp gauge goes to max then runs at normal temp. I get no over heating.

Anyone got any ideas. Tried the surch and possibly a new temp sensor but still the same with it unplugged.

Edited May 27, 2015 by Greenman

[Greenman]

Also the aux water pump dose not run on after ignition is off.

It is a 2004 diesel if that helps

[SilverBeast]

The 130 and 150bhp diesels don't run on after engine switch off, only when ignition is on.  It puzzled me for a while with mine.

[Greenman]

Thanks that's good to know it's not got anything to do with the temp gauge.

[SilverBeast]

Nope it should be running all the time the engines running to circulate water to the rear heater matrix, it doesn't get controlled by any sort of sensor at all.

 

Does your temp guage just go to max when you turn ignition on, then drop to the "cold" position before creeping up as the engine warms up?

[Greenman]

Does your temp guage just go to max when you turn ignition on, then drop to the "cold" position before creeping up as the engine warms up?

Yes that is exactly what is doss and the warning stop alarm comes on and off.

Edited May 27, 2015 by Greenman

[SilverBeast]

Is this the only dial that does this - I believe the dash can be programmed to sweep the needles when first turned on so someone may have done this.

 

I think It is more likely to be a  faulty engine temperature sender.  Which diesel enfgine do you have? If you intend to keep the Galaxy (or most other VW's - they built the MKI/IISharan/Galaxy/Alhambra's and the diesel and V6 engines) for any length of time I would definitely by a cheap VAG-COM/VCDS-LITE lead from ebay and download the free software.  It makes diagnosis of many electrical/engine issues much simpler and you will find a code for a faulty temp sensor if this is the case.

 

If you add your vehicle details to your "signature" then it is easier for members to help you.  Also if you fill in a better location in your profile you may find a local registered members will offer to scan for faults with VAG-COM/VCDS-LITE for you.

[Greenman]

Hi it is the only dial thst dose it. It has never done it before. will get a new sensor and fit it at the weekend.

Will get a lead cant belive they are only £5. thanks for the help it's appreciated.

[sparky Paul]

Will get a lead cant belive they are only £5. thanks for the help it's appreciated.

 

...and it'll be the best five quid you ever spent, they're worth their weight in gold.

[Greenman]

Just changed the temp sensor and taken the car out for a drive and all looks good. Will test it some more over the next few days and check the fault code when my lead comes next week.

Thanks again for your help.