Chris777

Seems similar . Couple more pics of mine, will have try and get a part number off it. Anyway of testing if is faulty ? Error didn't come back after adding coolant

Thanks Matt Firstly mate, really appreciate you sticking with me your support is great. When I first got it and run a Carly it came up (pic attached) Code said on google 'auxillary pump dry running' as wasn't open circuit and all coolant had been dumped in the crash I just thought stored and didn't come back after codes cleared. Looking back at the log it seems like 2 showed. Couple videos show 2 pumps 1.Heater support pump 2.Coolant pump for charge pressure cooler but think that's on a diesel (one at front like on the last pic of mine above) thought maybe the front was charge pressure one and I've not looked properly yet if one behind the sump as can't get skid tray all way off those t45s are a nightmare. But will look again tomorrow. I'm thinking that front one is low down and close to impact point would it affect the pressure of the whole system? I also dismissed initially as seemed to suggest that was only when parked to keep heaters warm but circling back to as heat now on 2k revs but cold idle and if also controls pressure/ flow could it be....

Thanks Matt, appreciate your help It's the little 1.4 TFSI petrol. Few more pics of mine if can point out where you mean. That last pic is looking up from under the middle of the bumper, is that the auxillary water pump? Could that be anything to do with? Where about is the stat located in all that jumble sorry I havnt got a clue. It's almost like when revving getting the flow but when idling not sufficient. I thought the top pipe was coming from the stat then round the radiator and cooled out the bottom? I've got back to front have i? Just coz top pipe gets toasty while bottom does get slightly warm (i mean the bottom pipe on near side with the temp sensor on the corner) other side / drivers side bottom pipe gets warm

Hi Matt Thanks for your message. The pipes into the matrix seem to be getting warm the top one I think it is warmer than the bottom. The bottom rad hose that I take off to drain noticed hardly gets warm even though the pipe at top of rad above it is red hot. The pipe feel cool of not cold and the coolant temp sensor is on that corner and reads 90degree on the cluster? (This sensor was out when I got the car and looked like where coolant had leaked from after accident) I used one vacuum for the 1st time today but was only a cheap one and couldn't work out how to get the little air in the line to the bottle out when it starts the intake. Seemed to only take about 5 litres again. Run it up and the heaters worked for first time but only when I was revving to 2k ish if on idle went back cold and the puffing/clicking sound started again. On 2k revs it was warmish but not hot and soon as dropped my foot off Instantly cooled air

Seemed to have OK flow, I put the hose on both outlets and flowed both ways. Was expecting to see some gunk but seemed quite clear. Could the water pump fail just insufficient flow? Damaged impeller or something but throw no check engine, no error, no leakage etc? When I very first let the remaining coolant out after it had its little bump noticed 2 tiny bits of hard plastic wondering if could be the impeller but would that throw check engine?

Hiya Matt Thanks for your message and pics. That is similar, same side and placement. Right side of the engine block then leading to the matrix. Just looks a little different on the A1. I have had those pipes off and the 2 off the rad and give a good flush through with the garden hose on full. I wanted to also use the karcher on half power but couldn't find a nozzle to fit just the hardest power lance and can only have that full power so didn't try it incase ruptured the matrix. I flowed and back flowed the matrix and seemed OK flow. I was hoping to see a load of crud come out like see on some YouTube vids but from what could see just little bit of coolant then water. It wasn't pouring through but seemed constant both ways. Hooked back up and run the Wynns flush through then flushed clean water again and dumped all out again. When was running up with the flush still no heat so wondering if done absolutely nothing with all the flushing. All left is to redo the coolant tomorrow with the vacuum pump which I didn't do initially just a normal top up fill. So hoping that it was an air block but was also hoping when run up after flush with just water would at least get a little heat to give me hope. The pump does that suck rather than push into the matrix? Do you have a flow diagram for the system by chance? Worth taking any other pipes off etc to run through before connecting all back up?

hi mate Thanks for reply, no not certain at all am a complete newbie at this. I though the water pump and start housing all came as one? Those 2 pipes I've taken off that lead to the matrix do they go onto the bypass ports then sorry? Am I OK using these to flush / backflush the matrix as can get off from port right up against the fire wall. thanks for your help

Afternoon Hope had nice weekend. Mine has been fighting the !Removed! coolant lines off the water pump as getting to the ports of the matrix next to the fire wall with that !Removed! heat shield is a reet ****. Decided to disconnect as next join as didn't want snap the matrix port as you warned . Finally got off pump. The lower pipe was full of lovely fresh coolant but the top looked gunked up and crusty. Pic below. Is the top one the inlet to the matrix or the other way round? Does all this muck look like matrix block / bad maintenance or likely lead to having to replace pump? Got too cold so had to abandon but all ready to now try and flush. Just wanted get your thoughts so far

Thanks Matt

Hi guys When flushing out should I run up to let thermostat open before taking bottom pipe off? Just thinking to try and get as much out as poss but then If I do and then cool when I vacuum refill will that mean more poss places for air blocks again?

Got you, I've had a good look and can't see one or the remnants of one

What am I looking at in the pic sorry?

Hi Matt. It says 'Mit Silikat' on side of header tank if has one apparently. Mine doesn't have this so presuming it didn't have in first place.

Hi Cliff Thanks for your input I came across the burst /leaking silica bag suggestion. Only some 8V got them apparently and if was present says on side of header tank. Thankfully looks like mine never had one. It is a copart rebuild front damage, the coolant temp sensor had somehow dislodged and all coolant out when I got it. Not sure if impact somehow dislodged but can find no other leak or damage to why the coolant came out. I have read the matrix can gum up if left sitting without coolant for a while (money was maybe 6 weeks max) hoping it's just a flush. Looking at the coolant carefully that came out couple tiny bits of plastic in it so also slight concern where from and if more stuck anywhere

Getting no leaking or check engine light, no faults at all.