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Author Topic: Ed30 Temp Gauge Drop When Coasting  (Read 14855 times)

Offline GrayMK5GTI

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Ed30 Temp Gauge Drop When Coasting
« on: March 14, 2014, 12:52:35 pm »
Afternoon All,

I collected my Ed30 on saturday and in general its running really well, still feels very tight  :smiley:

However. . . although it warms up quickly (definetly quicker than my K03 GTI did), and holds 90 degrees on the gauge when driving, if i take my foot off and coast down to a roundabout the water temp gauge drops a little bit - more noticable when coasting from 60mph to a standstill. When I accelerate away again it goes back up to 90 degrees quickly.

I did 200+ miles on the motorway over the weekend and whilst driving it held a solid 90 degrees still.

I've done a quick search, but most thermostat / temp sensor issues were about the car either taking a long time to warm up, or the fans coming on all the time, neither of which are similar to my issue.

For clarity, its got no fault codes, coolant is clean and full, Cambelt & water pump replaced by last owner in 2012.

Any ideas? does this sound normal for an Ed30?

Thanks,

Gray  :happy2:
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Offline V2 FAN

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Re: Ed30 Temp Gauge Drop When Coasting
« Reply #1 on: March 14, 2014, 03:53:28 pm »
Hi Mate

Not noticed any change in temp on mine, it holds a steady 90 until switched off  :happy2:

Offline GrayMK5GTI

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Re: Ed30 Temp Gauge Drop When Coasting
« Reply #2 on: March 14, 2014, 04:05:35 pm »
Thanks matey!

Is yours an Ed30? I heard they have different thermostats to a GTI. Was hoping to pin it on that  :sad1:

It's looking like the thermostat is not working 100% right then.
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Offline skard

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Re: Ed30 Temp Gauge Drop When Coasting
« Reply #3 on: March 14, 2014, 04:10:50 pm »
I have thermostat coming which I am putting on at the same time as a new timing belt.

The BYD (ED30) has a different stat according to ETKA - 06F121111H same price about £30
Used to have Edition 30 - number 009 and a GT TDI 140.
Now have an S4 B8 Avant (stage 2)

Offline doylebros

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Re: Ed30 Temp Gauge Drop When Coasting
« Reply #4 on: March 14, 2014, 06:10:25 pm »
This could be the auxiliary coolant pump running unnecessarily

http://www.ebay.co.uk/itm/VW-GOLF-MK5-GTI-04-09-2-0-TFSI-AUXILLARY-SECONDARY-WATER-PUMP-1K0-965-561-G-/231085460592?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item35cdc44c70

Chassis number dependant part number 1K0 965 561 G - price £136.93 full retail inc vat from the dealers.

Get it scanned to see if any sensors are faulty causing it to run?

Offline GrayMK5GTI

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Re: Ed30 Temp Gauge Drop When Coasting
« Reply #5 on: March 14, 2014, 07:11:45 pm »
^thanks.

I'll try to get some logging done later. I've read on the MK6 GTI forum that's it's quite common fault with those. They are all getting the thermostat replaced.
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Offline V2 FAN

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Re: Ed30 Temp Gauge Drop When Coasting
« Reply #6 on: March 14, 2014, 08:07:29 pm »
Thanks matey!

Is yours an Ed30? I heard they have different thermostats to a GTI. Was hoping to pin it on that  :sad1:

It's looking like the thermostat is not working 100% right then.

Hi mate yes it's an Eddie  :happy2: was out earlier and checked to confirm but it's certainly a steady Eddie at 90  :laugh:

Offline GrayMK5GTI

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Re: Ed30 Temp Gauge Drop When Coasting
« Reply #7 on: March 14, 2014, 09:39:58 pm »
Just been out for a drive. Did the little trick with the climate display to get the coolant temp shown in the display. Although the dash gauge was showing 90 degrees, the climate display was showing the coolant at around 74-76 degrees driving around at 30mph. I did a long run on the by-pass and allowed it to coast in gear where the climate dropped down to 70-71 degrees and the gauge dropped by one notch by the time the car had slowed from 80mph to 10mph.

I pulled over and the gauge moved back up to 90 degrees. I let the engine idle until the climate display showed 87 degrees where I could feel the heat on the radiator so the thermostat must have opened. When the climate said 89 degrees, the fan switched on and the temps dropped. During this, the gauge stayed at 90 degrees.

So to summarise, when I'm driving normally it holds 90 degrees on the gauge no problem, but after a long coast in gear from speed, the gauge drops a little. 
NOW: 2015 Golf R DSG 5 Door, Lapiz Blue, 19s, Discover Nav, Reversing Camera
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Offline GrayMK5GTI

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Re: Ed30 Temp Gauge Drop When Coasting
« Reply #8 on: March 17, 2014, 12:51:47 pm »
Done another load of reserch and i've seen threads on the Briskoda & Audi Forums where others have had the same problem.

Its looking like the thermostat is sticking a bit. Not a serious issue, but something that i'll get round to!
NOW: 2015 Golf R DSG 5 Door, Lapiz Blue, 19s, Discover Nav, Reversing Camera
GONE:2007 Black GTI Edition 30 3dr

Offline MichaelR

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Re: Ed30 Temp Gauge Drop When Coasting
« Reply #9 on: March 17, 2014, 01:02:16 pm »
Did the little trick with the climate display to get the coolant temp shown in the display.

How do you do that?
Reflex ED30 #2082
295 bhp / 315 ft·lb

Offline GrayMK5GTI

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Re: Ed30 Temp Gauge Drop When Coasting
« Reply #10 on: March 17, 2014, 02:22:54 pm »
Did the little trick with the climate display to get the coolant temp shown in the display.

How do you do that?

See here: http://www.golfmkv.com/forums/showthread.php?t=27

http://www.golfmkv.com/forums/showthread.php?t=9433

Note, 15:0 isn't oil temp. Can't remember what it is though.
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Offline MichaelR

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Re: Ed30 Temp Gauge Drop When Coasting
« Reply #11 on: March 17, 2014, 03:19:19 pm »
Thanks mate!
Reflex ED30 #2082
295 bhp / 315 ft·lb

Offline vRSAlex

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Re: Ed30 Temp Gauge Drop When Coasting
« Reply #12 on: March 17, 2014, 08:25:33 pm »
You need a new stat. Having it run low will hurt power and economy. Get it changed sooner rather than later.
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Offline GrayMK5GTI

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Re: Ed30 Temp Gauge Drop When Coasting
« Reply #13 on: March 17, 2014, 08:29:36 pm »
^ thanks Alex.

Stat ordered today. Looking forward to fitting this  :sad1:

We did the climate trick with my mates K03 GTI and that was running about 5 degrees warmer than mine
NOW: 2015 Golf R DSG 5 Door, Lapiz Blue, 19s, Discover Nav, Reversing Camera
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Offline GrayMK5GTI

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Re: Ed30 Temp Gauge Drop When Coasting
« Reply #14 on: April 10, 2014, 06:58:06 pm »
New stat has solved the problem  :jumpmove:

NOW: 2015 Golf R DSG 5 Door, Lapiz Blue, 19s, Discover Nav, Reversing Camera
GONE:2007 Black GTI Edition 30 3dr