AGU overheating
- 22irwin.mercure
- Enlisted
- Posts: 46
- Registered for: 7 years 6 months
- Car Make: Audi
- Car Model: S3
AGU overheating
Hello everyone
I have a 2000 audi A3 1.8T AGU that heats up only when I am stuck in traffic. However when I continue driving, the heat gauge goes back to 90, but the fan stays on. If I am stuck for more than 10 min, the coolant light comes on.
I have done cambelt and waterpump 10000km ago and never had this issue after the change in waterpump. The waterpump was from goldwagen and had a metal impeller.
1. I have had the car scanned, no codes.
2. Replaced thermostat and engine flush.
3. When doing the engine flush, the coolant colour was normal pink. But I still flushed the system anyway and put in fresh coolant.
Anything else to look at?
Any idea what could be causing this?
Diagnosis picks nothing up.
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I have a 2000 audi A3 1.8T AGU that heats up only when I am stuck in traffic. However when I continue driving, the heat gauge goes back to 90, but the fan stays on. If I am stuck for more than 10 min, the coolant light comes on.
I have done cambelt and waterpump 10000km ago and never had this issue after the change in waterpump. The waterpump was from goldwagen and had a metal impeller.
1. I have had the car scanned, no codes.
2. Replaced thermostat and engine flush.
3. When doing the engine flush, the coolant colour was normal pink. But I still flushed the system anyway and put in fresh coolant.
Anything else to look at?
Any idea what could be causing this?
Diagnosis picks nothing up.
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- Aslam_mk4
- SO FLUFFY, WE ALL GONNA DIE!
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- 22irwin.mercure
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- Posts: 46
- Registered for: 7 years 6 months
- Car Make: Audi
- Car Model: S3
Re: AGU overheating
Yes both fans come on when it gets to operating temp @90 and now stay on. But before it only used to come on when the car was getting hot, then it would go off as per normal. Now it's like always on.
Sent from my m1 note using TapatalkAslam_MK4 wrote:Is both fans working?
Check fan relays also
- PapaJo
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Re: AGU overheating
Check for airlocks in the cooling system and test the fan temperature switch.
- panic-mechanic
- Panic's Place
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Re: AGU overheating
Thermostat or even possibly the fan activation relay.
If it overheats with the fans on I suggest you start with a thermostat.
If it overheats with the fans on I suggest you start with a thermostat.
Stephan van Tonder - Jhb - Putfontein Benoni
'05 Audi A6 3.0L TDI Avant
'09 Touareg 3l TDI
'13 VW CC 2l tdi (repair project)
'05 Touareg v10
Perfect Power dealer. I do dyno tuning.
'05 Audi A6 3.0L TDI Avant
'09 Touareg 3l TDI
'13 VW CC 2l tdi (repair project)
'05 Touareg v10
Perfect Power dealer. I do dyno tuning.
- Dub rox
- Cadet
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- Car Model: Citi sport 1.4i
Re: AGU overheating
What he sayd. Sounds like the fan swich to mePapaJo wrote:Check for airlocks in the cooling system and test the fan temperature switch.
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- Dub rox
- Cadet
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- Car Model: Citi sport 1.4i
Re: AGU overheating
Did you put the correct temperature thermostat back in?22irwin.mercure wrote:Hello everyone
I have a 2000 audi A3 1.8T AGU that heats up only when I am stuck in traffic. However when I continue driving, the heat gauge goes back to 90, but the fan stays on. If I am stuck for more than 10 min, the coolant light comes on.
I have done cambelt and waterpump 10000km ago and never had this issue after the change in waterpump. The waterpump was from goldwagen and had a metal impeller.
1. I have had the car scanned, no codes.
2. Replaced thermostat and engine flush.
3. When doing the engine flush, the coolant colour was normal pink. But I still flushed the system anyway and put in fresh coolant.
Anything else to look at?
Any idea what could be causing this?
Diagnosis picks nothing up.
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OCD is not a disability is the ability to get it perfect
- 22irwin.mercure
- Enlisted
- Posts: 46
- Registered for: 7 years 6 months
- Car Make: Audi
- Car Model: S3
Re: AGU overheating
It overheats with the fans on and I have replaced the thermostat yesterday.panic-mechanic wrote:Thermostat or even possibly the fan activation relay.
If it overheats with the fans on I suggest you start with a thermostat.
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- 22irwin.mercure
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- Posts: 46
- Registered for: 7 years 6 months
- Car Make: Audi
- Car Model: S3
Re: AGU overheating
I hope so. I bought a replacement from goldwagen. I gave them my engine code and they gave me a replacement, with a new o ring. The new and old thermostat looked identical.Dub rox wrote:Did you put the correct temperature thermostat back in?22irwin.mercure wrote:Hello everyone
I have a 2000 audi A3 1.8T AGU that heats up only when I am stuck in traffic. However when I continue driving, the heat gauge goes back to 90, but the fan stays on. If I am stuck for more than 10 min, the coolant light comes on.
I have done cambelt and waterpump 10000km ago and never had this issue after the change in waterpump. The waterpump was from goldwagen and had a metal impeller.
1. I have had the car scanned, no codes.
2. Replaced thermostat and engine flush.
3. When doing the engine flush, the coolant colour was normal pink. But I still flushed the system anyway and put in fresh coolant.
Anything else to look at?
Any idea what could be causing this?
Diagnosis picks nothing up.
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- panic-mechanic
- Panic's Place
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- Location: Benoni, putfontein.
Re: AGU overheating
show me this thermostat that you replaced. picture or part number.
Stephan van Tonder - Jhb - Putfontein Benoni
'05 Audi A6 3.0L TDI Avant
'09 Touareg 3l TDI
'13 VW CC 2l tdi (repair project)
'05 Touareg v10
Perfect Power dealer. I do dyno tuning.
'05 Audi A6 3.0L TDI Avant
'09 Touareg 3l TDI
'13 VW CC 2l tdi (repair project)
'05 Touareg v10
Perfect Power dealer. I do dyno tuning.
- Dub rox
- Cadet
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- Car Model: Citi sport 1.4i
Re: AGU overheating
Not to diss you or anything, but is the thermostat fited the right way round? Common mistake. We're all human after all.
OCD is not a disability is the ability to get it perfect
- 22irwin.mercure
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- Car Model: S3
Re: AGU overheating
It goes in this wayDub rox wrote:Not to diss you or anything, but is the thermostat fited the right way round? Common mistake. We're all human after all.
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- 22irwin.mercure
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Re: AGU overheating
I will take a picture of the box and the old thermostat tomorrow.panic-mechanic wrote:show me this thermostat that you replaced. picture or part number.
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- panic-mechanic
- Panic's Place
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Re: AGU overheating
Did you by any chance test the thermostat to see thatbit works before installing?
Are both the radiator hoses hot at that point?
Are both the radiator hoses hot at that point?
Stephan van Tonder - Jhb - Putfontein Benoni
'05 Audi A6 3.0L TDI Avant
'09 Touareg 3l TDI
'13 VW CC 2l tdi (repair project)
'05 Touareg v10
Perfect Power dealer. I do dyno tuning.
'05 Audi A6 3.0L TDI Avant
'09 Touareg 3l TDI
'13 VW CC 2l tdi (repair project)
'05 Touareg v10
Perfect Power dealer. I do dyno tuning.
- Dub rox
- Cadet
- Posts: 326
- Registered for: 5 years 6 months
- Car Make: Vw
- Car Model: Citi sport 1.4i
Re: AGU overheating
Silence is allso an answer.....panic-mechanic wrote:Did you by any chance test the thermostat to see thatbit works before installing?
Are both the radiator hoses hot at that point?
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OCD is not a disability is the ability to get it perfect
- 22irwin.mercure
- Enlisted
- Posts: 46
- Registered for: 7 years 6 months
- Car Make: Audi
- Car Model: S3
Re: AGU overheating
Sorry had some issues with my account... Turned out to be a a faulty fan switch. The 3 pin one. Fan was only working intermittently so the overheating is sorted.
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