Thermostat bust?

[maxpayne]

Howdy,

While on a drive back from Birmingham to London over the weekend, I noticed that the oil temperature gauge was stuck at around 72 degrees. But switched to 90 soon after hitting London and A1. Typically it’s bang on 90 when I drive in London for trips to Tesco which is what the car mostly gets used for!

This reminded me that it wasn’t the first time I would have seen this happening and I have seen this happening on motorways a few times before but it’s only been there for the last year or so - which also coincides with the car suddenly becoming a little less fuel efficient - something that I originally thought was because of an issue with the MAF because of two specific errors:

P3193 - 002 - Open Stop outside of valid range - Intermittent and
P0640 - 002 - Intermittent - Intake Air Heater Control Circuit

While these two are also likely contributors (after all bad luck comes in threes) I suspect that the thermostat is also gone? Or could it be the coolant temperature sensor also or something else?

Cheers.

 

[LEE69]

Perfect traits of a failed Thermostat
No, other codes nothing to do with it, issues on their own

 

[maxpayne]

Perfect traits of a failed Thermostat
No, other codes nothing to do with it, issues on their own

Cool (no pun intended). Apart from the thermostat and G12 (the pink fluid) anything else I need to order, e.g. seal/gasket?
Thanks.

 

[LEE69]

I think it is all in the box what you need. Only use a genuine stat

 

[maxpayne]

Doh! Forgot to ask how many litres of G12 do I need? Does it have to be OE?

I’m being quoted £31.50 for the stat and £9.10/litre for G12.

 

[LEE69]

No not sure how much but you'll lose a fair bit halfords sell it cheaper premixed or neat

 

[LEE69]

ask for a parts request on here, may get it cheaper

 

[abmat]

Search eBay. I get 10l for about £15

 

[maxpayne]

Search eBay. I get 10l for about £15

Are you sure? Unless I', missing something, no good deal under £30!

 

[abmat]

Apologies. Yes the last deal I got was £26

 

[Nessy]

I think the latest antifreeze is G13, at least my current bottle is.
I personally wouldn’t touch any antifreeze or thermostat that wasn’t Genuine, aftermarket antifreeze might be ok, but Genuine hardly breaks the bank .
When changing a thermostat is so fiddly on some models (it wasn’t a nice task on my BKD) then why risk an aftermarket thermostat, again Genuine was a no-brainer for me...

 

[samisnake]

Always wondered whats the difference between g13 and regular pink oat antifreeze. Does it make much difference or paying the vag tax?

 

[maxpayne]

I think the latest antifreeze is G13, at least my current bottle is.
I personally wouldn’t touch any antifreeze or thermostat that wasn’t Genuine, aftermarket antifreeze might be ok, but Genuine hardly breaks the bank .
When changing a thermostat is so fiddly on some models (it wasn’t a nice task on my BKD) then why risk an aftermarket thermostat, again Genuine was a no-brainer for me...

Agree. Genuine thermostat is a must and I’ll get that for sure.

WRT the coolant, turns out that I need G12++, which is the last iteration of G12. G12++ is commonly referred to as G40, hence the lack of G12 results on eBay. Halfords does G40 for reasonable price it seems.

 

[LEE69]

G12 and G13 can be mixed safely, no idea on G40

 

[maxpayne]

G12 and G13 can be mixed safely, no idea on G40

Are you sure? They are fundamentally different in makeup?

 

[LEE69]

Yes backwards compatability

 

[LEE69]