Coolant temp fluctuating? How long does your 1.8t take to warm up?

[The Dave]

Hi guys, not long had my 1.8 20vt Golf.. One thing I've noticed is it takes a while to hit 90 degrees. I can do 15 mins of driving for 5 miles or so, town driving so low speeds (you'd think it'd maybe warm up fairly quickly stop starting a bit) and it only just hits 90 degrees by then...

But in the last couple of days, it warms up as usual, a little slower perhaps.. I know the outside temperature is a bit lower now but I've noticed the temp gauge fluctuating between 80 and 90 degrees a lot, even when idling parked up sometimes...

Any clues? Be interested to generally know how long your cars take to warm up though with this engine (mines an AGU lump).

Ta

[jtomlin]

doesnt sound right, might be some sensors that need replacing

[trez]

mine doesnt move at all
lol sensor been replaced as well

[T_J_G]

when you're doing 70mph does it drop off the 90 mark?

My money is on a new thermostat. There is a guide i wrote in the maintenance section.

[Schuey]

Hi guys, not long had my 1.8 20vt Golf.. One thing I've noticed is it takes a while to hit 90 degrees. I can do 15 mins of driving for 5 miles or so, town driving so low speeds (you'd think it'd maybe warm up fairly quickly stop starting a bit) and it only just hits 90 degrees by then...

But in the last couple of days, it warms up as usual, a little slower perhaps.. I know the outside temperature is a bit lower now but I've noticed the temp gauge fluctuating between 80 and 90 degrees a lot, even when idling parked up sometimes...

Any clues? Be interested to generally know how long your cars take to warm up though with this engine (mines an AGU lump).

Ta

Yep sounds like the thermostat.

[navmk4gti]

i had exact same problem change thermostat and temp sender.. both cheap parts 

[T_J_G]

 http://www.golfgtiforum.co.uk/index.php?topic=101783.0

[Mr_Orange]

My money is on a new thermostat.....

Ditto that, exact symptoms I had.  Also a good excuse to ditch the old coolant and perhaps (if you are feeling keen) a couple of sensors with the coolant drained?

[The Dave]

Does sound thermostat related, gonna keep my eye on it.

Was due a cambelt and waterpump change in a couple of weeks so was planning on dumping, flushing and replacing coolant anyway.

More money to spend lol

[dubcruiser]

i had exact same problem change thermostat and temp sender.. both cheap parts 

+1 

Got my temp sender changed the other week and the car is a lot smoother now and the MPG has gone up!!