coolant issues

[allygti]

hi guys, i've tryed searching and looking through FAQ's but i cant seem to find anything relevant. appologies in advance if ive missed a relevant topic.

i've recent bought a LC, engine code AUQ.

i bought it with a cracked block, which was causing a nasty water leak, ( no oil in water or vice vera) engine was built with a new block, but im having some teething problems.

i can run the car up to 90 degrees no problem, though it does come up to temp fairly quickly, ( cold start to 90 in less than 6-7 mins ) top hose gets hot, bottom hose remains cold.

i suspect a blockage somewhere, tryed the usuall pulling the rad hoses off and letting water run through.

water runs through the radiator itself freely, water runs from the expansion tank to the top rad hose freely, but my suspect blockage seems to be somewhere around where the bottom rad hose joins the block.

i'm not to clued up in anything with a turbo.. ( i was one of the numptys who claimed N/A was best lol )

what temp should the thermostat open? what are the chances of it being blocked or stuck shut? also will i have to remove the alternator to get into the thermostat housing ?

thanks in advance for any help, im at my wits end lol

Ally.

 

[LEE69]

You can remove it easily

http://www.seatcupra.net/forums/showthread.php?t=210977&highlight=thermostat

Boil the stat up and see what temp it opens at, if it opens ok , then i'd say water pump is at fault.

 

[allygti]

i hope its not a water pump, ive spent far to much on this already its not even on the road yet.

cheers for the diagram, can see what i'm doing now. i hate cars lol

 

[LEE69]

Water pump go on them, sad fact
Did you not re-new it with the new cambelt kit?

 

[Muttley]

The thermostat will keep the bottom hose blocked until the engine is hot. Should open when the coolant in the block reaches between 85°C and 90°C. Full opening is at least 7mm.

 

[allygti]

arghh i dont understand turbos lol, put a mk2 infront of me and ill rebuild it with me eyes shut lol

 

[LEE69]

Same with any engine, just forget the turbo bit

 

[allygti]

all these sensors! haha

i plugged it into the OBD2 and got turbo pressure valve? any idea what this could be ?

 

[LEE69]

Dump valve

 

[allygti]

its just got the standard bosch effort in, will this be knackerd? i noticed there wasnt a jubilee clip or anything holding it into the pipe from the airbox, but there is on the pipe that runs to that metal one lol

also its a nightmare to start :S will this be something to do with that ?

 

[LEE69]

Possibly.
Starting could be CTS knackered?

No other codes coming up?

 

[allygti]

just the dump valve, engine management light was on, when i reset it it started 1st time.

should pull the turbo off and throttle body it lol

 

[LEE69]

Nice idea not heard of it on a Leon but I'm sure it must have been.

 

[allygti]

i have no idea what a CTS is? im completely scunnered with this car

 

[LEE69]

Coolant Temperature Sensor

On the right of the engine in the top coolant hose.

 

[allygti]

oh i should have been able to work that out lol, it had a crank sensor before i got it, im think its maybe something to do with that ?

 

[LEE69]

Yeah possible too, that's why i asked what codes you had

 

[allygti]

was only the dump valve that came up on my reader, dont have a clue where to start, more money to get someone else to fix it lol