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[Anthony in Madrid]

Hi Everyone
Hope your day is going well.

Have been advised to change the thermostat whilst changing the oil cooler as I have access to it during.
My question is...

What are the symptoms of a faulty thermostat?

Cheers
Ant
 

[zirk]

Low temp, heats up whilst stuck in traffic, cools down again on a run.

[Andy B]

.....
My question is...

What are the symptoms of a faulty thermostat?

Cheers
Ant
 

Generally the engine doesn't get up to full working temp and it's slow to get to its max temp ie the 'stat is stuck open. If it was stuck shut, you'd know about it as the car would continually over heat. 

[omega3000]

Will the heater be cooler on full heat .. ie not hot enough  Just asking as i was about to ask the same thing and my heater wont get burning hot 

[tidla]

I fitted a thermostat, "because i was in there" removing a gm item and fitting a qh brand. wish i hadnt as after 12 months it stuck shut and nearly fried my block.

[sjr47]

Will the heater be cooler on full heat .. ie not hot enough  Just asking as i was about to ask the same thing and my heater wont get burning hot 

Yep, came back up M5 from Bristol one cold night last year temp never went above 82oC heater useless nearly froze screen up changed stat ASAP lovely n warm again.

[omega3000]

Will the heater be cooler on full heat .. ie not hot enough  Just asking as i was about to ask the same thing and my heater wont get burning hot 

Yep, came back up M5 from Bristol one cold night last year temp never went above 82oC heater useless nearly froze screen up changed stat ASAP lovely n warm again.

Time to confront the Bs'd bolt then 

[Webby the Bear]

Don't cross thread the b bolt. I repeat. Don't cross thread it. 

[omega3000]

Don't cross thread the b bolt. I repeat. Don't cross thread it. 

I think it took an hour or so to home the bolt last time 

[sjr47]

Don't cross thread the b bolt. I repeat. Don't cross thread it. 

I think it took an hour or so to home the bolt last time 

Ah memories did mine when temp was close to freezing !! upside being you don,t feel the skinned knuckles till later, ended up ditching the lifting bracket and fitted a horseshoe. shaped washer to infill after locating bolt

[Broomies Mate]

Don't cross thread the b bolt. I repeat. Don't cross thread it. 

I think it took an hour or so to home the bolt last time 

Lovely hot air from the vents in mine Mr EMD. 

[Webby the Bear]

As to the original question.  .  .

If your cars not getting up to temperature, start the car from cold and keep yr hand on the top hose. If it gets warm / hot quickly then you know the stat is opening too soon.