#1: Is there a DIY to change thermostat? Author: crocdino, Location: LeedsPosted: Sat Apr 06, 2013 3:29 am ---- I've done a search but can't find a anything...
Or has anyone a picture showing its location?
Car is a multiplex 138 GTI
Cheers for any help
#2: Re: Is there a DIY to change thermostat? Author: Edward, Location: In the garagePosted: Sat Apr 06, 2013 4:09 am ---- Very easy. It's on the front of the thermostat housing which is the block on the side of the engine with the green sensor on it.
The thermostat is the plastic part with 2x 10mm bolts holding it into the thermostat housing. The top radiator hose attaches to the thermostat.
Take the bottom hose off the radiator or open the drain screw that might be fitted to the radiator bottom. Remove the reservoir cap at the same time.
When no more water comes out remove the top hose from the thermostat and then remove the 2x10mm bolts that hold the thermostat in place.
Put the new thermostat in and connect the hoses.
Put at least a litre of coolant in and the rest can be water. Open the bleed screw on the thermostat housing. Thats the little copper/brass looking screw with the allen key fitting in. That will let the air out of the system. Top up the coolant reservoir as necessary. Screw the bleed screw back in. Dont over tighten it. You can remove maybe 95% of the air even without starting the engine.
Start the engine and let it idle for a minute or so then open the bleed screw again and more air should come out. You can also bleed air from the heater hose that goes into the bulkhead. Take the car for a quick run and then open the bleed screws again to see if any air comes out. Check the coolant level again.
#3: Re: Is there a DIY to change thermostat? Author: crocdino, Location: LeedsPosted: Sat Apr 06, 2013 5:36 am ---- I'll give it a go... Just need to get hold of a 'stat.
Would you say a pattern part will do or should I get genuine?
Hoping this will be the answer to my slight drop in economy. It's been bad for 6 months or so but only this morning I noticed it wasn't getting hot. When the oil reached 90 dev's the coolant was still hanging around 70/75 so I bet it's over fuelling.
#4: Re: Is there a DIY to change thermostat? Author: macca1411, Location: Westhoughton, LancashirePosted: Sat Apr 06, 2013 6:14 am ---- What's the normal running temp for the car?
I wouldn't go throwing parts at it in the hope of solving the problem. Locate the real problem and then fix it.
#5: Re: Is there a DIY to change thermostat? Author: crocdino, Location: LeedsPosted: Sat Apr 06, 2013 9:28 am ---- The 'stats have an opening temperature of around 88 degrees... and they should keep it running at around that range when warned up...
I can drive it for half an hour without it going over 75 degrees, No other issues, no leaks, no nothing... The thermostat is the only thing controlling the temperatures.
Had the same issue on the 335d, although that's half the age of this! and its got 2 stats. Both were knackard. Soon as they were replaced it hit temps straight away.
#6: Re: Is there a DIY to change thermostat? Author: crocdino, Location: LeedsPosted: Sat Apr 06, 2013 9:30 am ---- So the dodgy 'stat is the real problem... it's not a question of 'throwing parts at it'
#7: Re: Is there a DIY to change thermostat? Author: 206gti_chris, Location: SussexPosted: Wed May 01, 2013 10:26 am ----
crocdino wrote:
I'll give it a go... Just need to get hold of a 'stat.
Would you say a pattern part will do or should I get genuine?
Hoping this will be the answer to my slight drop in economy. It's been bad for 6 months or so but only this morning I noticed it wasn't getting hot. When the oil reached 90 dev's the coolant was still hanging around 70/75 so I bet it's over fuelling.
stat is probably stuck open, over cooling the engine i just changed mine had the same problem bought a new stat for £16 quid on eurocarparts, followed Mr edwards guide bingo sweet as a nut
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