tdi 90 running cool

[chris_90]

Recently bought a vw vento 1.9 tdi 90bhp the pre pd engine, now it runs very cool can get it up to 80degree if I'm sat in traffic for around 30mins+ but soon as I start moving again temp drops down to 70 or even lower some times.

So what could cause it? I'm thinking thermostat stuck open maybe?

We're is the thermostat on these engines?

Help welcome :)

[Guest 2]

Probably thermostat. Buy genuine or OE spec if you can.

Welcome.

[chris_90]

We're abouts is the thermostat on the engine? Is it on the cylinder head were the top rad pipe meets the engine?

[Guest 2]

I have no idea I'm afraid, sorry.

[Sam]

What is the engine code?

[chris_90]

What is the engine code?

I don't no tbh how can I find that out?

[Sam]

Look on top of the timing belt cover or on a sticker in the boot/spare tyre well.

It's a late model Vento (1997/8?) and as you've said it's a TDI 90 it's only going to either a 1Z or an AHU.

On a 1Z (and possibly an AHU) the thermostat is on the right side of the engine - here a photo (not mine) which should help photo found on the internets (http://i9.photobucket.com/albums/a85/JungleMan1978/ETKA/scan0006.jpg) it's number 12 in the image.

The housing gets brittle over time too and often breaks when trying to remove it, make sure your friendly local stockist has a spare in stock before you start work.

Good luck ;)

[chris_90]

That's great thanks I will check see if I can get the housing and thermostat from vw then

Thanks for help :)

Will update when I've done it see if it cures the issue

[chris_90]

Fitted thermostat today now gets up 90 and stays there with out issue :)

Thanks for help guys

[Sam]

Good news - how was the housing?

[chris_90]

Housing come off fine stayed in one pice sods law really cos if I hadn't bought a new one you can grantee it would have broke.