awx engine not warming up

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Mattybs15
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awx engine not warming up

Post by Mattybs15 » Wed Aug 14, 2019 5:59 pm

hi all im new here but iv got an awx b5.5 and iv got a problem with the engine not heating up well ill explain.

on the gauge cluster and the diagnostic menu on the climtronic the engine coolant temp shows as a max of 65 it even cools when on the motorway down too 60.

on vcds at the same time the coolant temp shows as over 100 degrees. i could understand a miss reading of 10 degrees but it reading almost double what the dash says.

does vcds get its temp reading from a different sensor than the dash? as i cant understand how theirs 2 different readings for the same temp.

iv replaced the thermostat and the coolant temperature sensor. and iv checked that the new stat opens in hot water.

my bottom radiator hose and the rubber part of the top hose are cold and so is the radiator.

the fan clutch is not ceased as to over cool the engine.

does anyone have any suggestions?

im leaning toward the water pump having failed.

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Gazwould
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Re: awx engine not warming up

Post by Gazwould » Wed Aug 14, 2019 6:21 pm

What brands of thermostat and CTS did you use ?
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Indigo Blue Sport Wagon 0.34 m-1 blower .


I'd give her some 'trivago' .

Mattybs15
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Re: awx engine not warming up

Post by Mattybs15 » Wed Aug 14, 2019 6:48 pm

A circoli stat and haas temp sender from euro car parts

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Gazwould
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Re: awx engine not warming up

Post by Gazwould » Wed Aug 14, 2019 7:25 pm

Image

Indigo Blue Sport Wagon 0.34 m-1 blower .


I'd give her some 'trivago' .

Mattybs15
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Re: awx engine not warming up

Post by Mattybs15 » Wed Aug 14, 2019 7:54 pm

Iv done all that and it still not getting up to temp

Vcds still reads a different temp to the dash

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BIG F@ TW@
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Re: awx engine not warming up

Post by BIG F@ TW@ » Wed Aug 14, 2019 9:19 pm

Water pump is next logical step.

Sent from my brain Telepathetically...


maclee
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Re: awx engine not warming up

Post by maclee » Wed Aug 14, 2019 10:05 pm

A few years ago I fitted a pattern part CTS (£5ish) in my SEAT to fix a non-start/rough running problem. It never really seemed to be very satisfactory and after about a week the engine would again not start easily.

I was not keen to spend £34 on a genuine part, but it was the only way I could get one and fit it before the weekend.

The genuine one returned normal operation straight away and has been in there ever since.

Form you own opinion, but following that experience I would not use anything other than a genuine CTS, and based on what I have read here I would not use a Circoli thermostat, (the one I fitted was a Meyle, which has performed well ever since).

MrPassat02
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Re: awx engine not warming up

Post by MrPassat02 » Wed Aug 14, 2019 10:20 pm

If your pump had failed the engine would be boiling over.

Silly question but have you put the CTS in the right place ie not in the radiator, as that is where the rad fan sensor goes.

Mattybs15
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Re: awx engine not warming up

Post by Mattybs15 » Thu Aug 15, 2019 4:51 am

I replaced the green one at the back of the engine with a new green one.

Its not boiling over, there's no water coming out anywhere i just cant understand how vcds is giving a higher temp than the dash.

Is there a way to test the water pump is pumping?

MrPassat02
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Re: awx engine not warming up

Post by MrPassat02 » Thu Aug 15, 2019 8:43 am

I would tend to trust the 65C reading.
Also if it reduces to 60 on motorway surely that proves the cooling system is basically sound.

Unfortunately I don’t know where vcds gets its data from but afaik there’s only cts and rad fan sensor.

The clear message from posts so far is not to trust curcoli stuff so maybe consider replacing with quality items.

My car came to me with stuck open stat, defectivevCts and another cts where rad fan sensor should be. Car ran permanently cool and electric fan permanently on.

Once sorted all is well and mpg average 50.

Btw the temp gauge seems to be run by cts although it is highly smoothed

Mattybs15
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Re: awx engine not warming up

Post by Mattybs15 » Thu Aug 15, 2019 9:21 am

Im going to tighten up the pinson the loom conector tonight to see if thats adding extra resistance its all i can think of

MrPassat02
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Re: awx engine not warming up

Post by MrPassat02 » Thu Aug 15, 2019 10:33 am

While you’ve got it disconnected maybe see what Vcds reads so as to determine whether it’s reading from cts or elsewhere ..

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ct.p
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Re: awx engine not warming up

Post by ct.p » Thu Aug 15, 2019 10:55 am

To clarify, the CTS at the back of the head has two outputs, one to the gauge and one to the ECU.

Only fit an OE VW or Beru CTS, the circoli stat should be ok. Even OE grade CTS's are notoriously unreliable so anything worse / cheaper should go in the bin. I found this out through experience.

Also the stat can take at least 10-15 minutes to open at moderate speed >60mph, and around town sometimes will not open at all.

If it were my car, I would change the CTS and stat again.
VCDS and Vagtacho in Maidenhead Berks

Mattybs15
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Re: awx engine not warming up

Post by Mattybs15 » Thu Aug 15, 2019 11:54 am

Thanks

I would assume then that vcds would read the measurement from the Does anyone know what temp the electric fan comes on at?

Also does anyone know where i can get a wiring diagram for the ecu and instrument cluster?

I will swap them to original parts if i get no luck with the pins on the connectors.

I will report back

Mattybs15
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Re: awx engine not warming up

Post by Mattybs15 » Thu Aug 15, 2019 4:58 pm

Iv bloody fixed it.

It was the rubbish euro car parts coolant temp sensor. I pit the old one back in to which has the audi logo on.


Thanks to all for the help

maclee
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Re: awx engine not warming up

Post by maclee » Thu Aug 15, 2019 5:10 pm

That is good news.

I think that everyone here should perhaps now adopt the mindset that anything other than a genuine CTS is suspect, because this has happened so many times.

Really pleased that you have cured the problem.

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ct.p
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Re: awx engine not warming up

Post by ct.p » Thu Aug 15, 2019 6:45 pm

Told you it should go in the bin :hyst
VCDS and Vagtacho in Maidenhead Berks

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Gazwould
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Re: awx engine not warming up

Post by Gazwould » Thu Aug 15, 2019 7:28 pm

Hassle

Meyle also good for CTS as sold by Murray's Direct.


Image


They would know / only sell brands that work .
Image

Indigo Blue Sport Wagon 0.34 m-1 blower .


I'd give her some 'trivago' .

gtijames
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Re: awx engine not warming up

Post by gtijames » Thu Aug 15, 2019 7:43 pm

Wow love the shop front, like the 90s all over again

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Gazwould
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Re: awx engine not warming up

Post by Gazwould » Thu Aug 15, 2019 8:00 pm

Ahh , those hedonistic heydays .
Image

Indigo Blue Sport Wagon 0.34 m-1 blower .


I'd give her some 'trivago' .

howey
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Re: awx engine not warming up

Post by howey » Sun Aug 18, 2019 6:53 pm

Fab frontage!!

Used them via ebay for cts, they sell beru and meyle, asked them difference other than the cost and they said both are good with no issues!

Went for beru as didnt want any possible headaches!! Worked perfect!!

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