MK5 Golf GTI

All Things Mk5 => How to Guides / Troubleshooting => Topic started by: Ant b on November 05, 2017, 11:04:10 pm

Title: Slow warm up
Post by: Ant b on November 05, 2017, 11:04:10 pm
Hello think I may have a small issue but am not sure,
I’ve just had a new thermostat fitted and now my car does get to 90 and stayed there,but does seem to take a while what could it be
Title: Re: Slow warm up
Post by: Dan_FR on November 06, 2017, 07:26:17 am
Depends what you mean by a while..... The drop in temperature, coupled with having the heaters on inside the car can have a massive impact on warm up time......

For instance - Mine can get up to 90 on the gauge in about 2 miles..... but if I drive gentle and have the heaters on full blast it'll take a lot longer

If there definitely is a problem then it will be caused by the thermostat you've just fitted as that is what controls engine temperature
Title: Re: Slow warm up
Post by: lukemk5gti on November 06, 2017, 08:10:31 am
It's your inline thermostat

End of
Title: Re: Slow warm up
Post by: mjmallia on November 06, 2017, 10:01:00 am
Got a similar problem where at idle the temp starts to go down a little and that points to an open inline bypass stat.

Replacing mine but noticed the new genuine replacement lets a little air pass when I blow through it..........is that ok?
Title: Re: Slow warm up
Post by: Ant b on November 06, 2017, 10:26:42 am
It's your inline thermostat

End of

We’re is the inline one
Title: Re: Slow warm up
Post by: Ant b on November 06, 2017, 10:29:47 am
It isn’t half as bad as it was but like last night it was 8 deg out and I had my heaters on,but I got out my town stopped at lights etc then drove a few mile down the duelcarrage way.
My old s3(mk1)was quicker I think
Title: Re: Slow warm up
Post by: mjmallia on November 06, 2017, 10:32:56 am
The manual AXX has it near the throttle body pipe........the DSG has another above the gearbox
Title: Re: Slow warm up
Post by: Ant b on November 06, 2017, 10:47:30 am
The manual AXX has it near the throttle body pipe........the DSG has another above the gearbox
Don’t suppose you have the part number for the inline one,tps said when I orderd the main one they only do one
Title: Re: Slow warm up
Post by: lukemk5gti on November 06, 2017, 01:16:20 pm
The manual AXX has it near the throttle body pipe........the DSG has another above the gearbox
Don’t suppose you have the part number for the inline one,tps said when I orderd the main one they only do one

Info on how I replaced mine on my build thread
http://www.mk5golfgti.co.uk/forum/index.php/topic,89715.msg907250.html#msg907250
Title: Re: Slow warm up
Post by: mjmallia on November 06, 2017, 02:05:31 pm
4E0 121 113
Title: Re: Slow warm up
Post by: Ant b on November 06, 2017, 04:32:12 pm
4E0 121 113
Don’t understand tps and a bloke on eBay says that they only have one thermostat(main) for my engine code axx
Title: Re: Slow warm up
Post by: mjmallia on November 07, 2017, 10:32:33 am
TPS is Volkswagen Trade Parts Specialist............basically the supplier of genuince parts to dealers, but some people get accounts like myself (ex HQ and dealer employee) and gain trade price on parts.

If you do not have access to this then do throught the dealer.......just ask them if your car has the part number mentioned.....I bet money on it having one being an AXX.
Title: Re: Slow warm up
Post by: lukemk5gti on November 07, 2017, 11:48:00 am
4E0 121 113
Don’t understand tps and a bloke on eBay says that they only have one thermostat(main) for my engine code axx

He's wrong.

Mine is AXX manual and it has an inline. I replaced it myself but I don't have the part number.

The DSG has two inlines depending on the year. Same part number.
Title: Re: Slow warm up
Post by: mjmallia on November 07, 2017, 02:54:05 pm
Part number is 4E0 121 113
Title: Re: Slow warm up
Post by: mjmallia on November 08, 2017, 02:39:03 pm
Changed my inline stat today and the old one was wide open.  The car warms up a lot quicker now and does not drop in temperature at idle like before 😊
Title: Re: Slow warm up
Post by: Ant b on November 08, 2017, 04:22:36 pm
TPS is Volkswagen Trade Parts Specialist............basically the supplier of genuince parts to dealers, but some people get accounts like myself (ex HQ and dealer employee) and gain trade price on parts.

If you do not have access to this then do throught the dealer.......just ask them if your car has the part number mentioned.....I bet money on it having one being an AXX.
That’s just it tps are saying I havent got one and bloke one eBay is saying the same,should I just buy one of eBay
Title: Re: Slow warm up
Post by: Ant b on November 08, 2017, 04:23:29 pm
Changed my inline stat today and the old one was wide open.  The car warms up a lot quicker now and does not drop in temperature at idle like before 😊
We’re is it located
Title: Re: Slow warm up
Post by: mjmallia on November 08, 2017, 08:29:46 pm
The manual AXX has it near the throttle body pipe, have to look carefully as it is partially hidden........the DSG has another above the gearbox
Title: Re: Slow warm up
Post by: Ant b on November 08, 2017, 11:12:27 pm
I carnt find it on any diagrams online so am really confused
Title: Re: Slow warm up
Post by: v4rley on November 09, 2017, 07:35:07 am
http://www.mk5golfgti.co.uk/forum/index.php/topic,75756.msg798616.html#msg798616
Title: Re: Slow warm up
Post by: Ant b on November 14, 2017, 10:19:37 am
I’ve located it in the engine bay,but there’s no point taking it of to try find a part number till I have a new one,should I just buy one of ebay
Title: Re: Slow warm up
Post by: lukemk5gti on November 14, 2017, 11:32:12 am
@AntB (http://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=9507) here is your definitive answer

If you have two inline stats which is sounds like you do.

Buy two of these 4E0 121 113 - https://www.ebay.co.uk/p/Original-Volkswagen-VW-Genuine-Transmission-Cooler-Thermostat-4E0121113/1016963273

Then buy some coolant G13 now has superceeded G12

You need a special pliers to release the clips as per this thread - http://www.mk5golfgti.co.uk/forum/index.php?topic=78341.0

If this is too difficult then go to your local garage and ask them to do it.
Title: Re: Slow warm up
Post by: mjmallia on November 14, 2017, 01:09:41 pm
Get a genuine one and not a aftermarket version.

You want to change it once due to the hastle factor.
Title: Re: Slow warm up
Post by: Ant b on November 15, 2017, 11:06:51 am
The inline one dosent look 2 difficult,I still don’t get why tps and ecp say I haven’t got one tho
Title: Re: Slow warm up
Post by: Ant b on November 20, 2017, 11:26:38 am
@AntB (http://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=9507) here is your definitive answer

If you have two inline stats which is sounds like you do.

Buy two of these 4E0 121 113 - https://www.ebay.co.uk/p/Original-Volkswagen-VW-Genuine-Transmission-Cooler-Thermostat-4E0121113/1016963273

Then buy some coolant G13 now has superceeded G12

You need a special pliers to release the clips as per this thread - http://www.mk5golfgti.co.uk/forum/index.php?topic=78341.0

If this is too difficult then go to your local garage and ask them to do it.

I only have one as it’s a gti
Title: Re: Slow warm up
Post by: Ant b on November 29, 2017, 06:33:04 pm
Finally done this today,was really easy tbh,the old one was f**ked and I could blow both ways now it warms up really fast even with the heaters on
Title: Re: Slow warm up
Post by: pudding on November 30, 2017, 02:25:25 pm
Good stuff.  Not a good time of year to have heater woes!
Title: Re: Slow warm up
Post by: Ant b on November 30, 2017, 05:52:07 pm
No defiantly not!!
Glad both my main and inline have been done now,was bloody cold upside down on the drive doing it but so glad it’s fixxed
Title: Re: Slow warm up
Post by: fsiGeek1 on April 20, 2018, 10:01:49 pm
I replaced main thermostat and inline on my MK5 GTI, now temp stays steady at 90 once it reaches there.  It still takes so long to warm up. 10-12mins of driving until it reaches operating temp. Is that normal?  What are your warm up times?
Title: Re: Slow warm up
Post by: mjmallia on April 24, 2018, 10:26:55 am
3 miles and mine is at operating temp.....like clock work now.

If you have a DSG there are two inlines.