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Discussion Starter #1
my 3 litre gtv has been running a bit cool........only going up to the magic 90 deg in traffic.......bought a new thermostat from shop4parts
back in july......finally got round to fitting it yesterday...easy job only took 10 mins......but it has made no difference at all !!!!!
do you think i could have bought a duff thermostat or could it be something else.......?????.....help
 

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I would guess that a faulty gauge is as likely as a second faulty thermostat? Although if it does show 90ºC in traffic then maybe not...

Have you felt the big pipes to the radiator during warmup? If they get hot at the same rate as the return pipe to the block then it is likely the thermostat is to blame.
 

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I always thought it was normal when running like you described.
Mine, although a 2ltr, sits at about 75/80 in free flowing traffic.
Hits 90 in slow/non moving traffic. Soon as it just goes past 90 (91/92) the cooling fan cuts in.
 

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I replaced mine as it was only running at 60 degrees on a run. Like yours it went up to 90 in traffic and also the heat in the cabin was fine.

It now runs at 75 degrees and 90 in traffic. All seems fine to me.
 

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Not wanting to kick off an old argument but there is a school of thought out there which goes along the lines of

*anything under 90ºC once the engine has warmed up is wrong* as the termo is supposed to open at 88ºC, hence the rad should not cool the engine below this temp and the temp should come back up towards 90.

My temp was 70 in open road driving, changed the stat brought it back up to 90. I'm pretty convinced.
 

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bigmac, on a motorway doing 70-80mph on a day like today you reckon your temp will be 90 degrees?
 

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Discussion Starter #8
must admit i was under the impression that the temp was supposed to sit at 90 deg......might have a look at the coolant sensor....anyone know where it is on a 3 litre and is it an easy fix ?
 

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bigmac, on a motorway doing 70-80mph on a day like today you reckon your temp will be 90 degrees?
Yeah mine sits just under the 90 line on the motorway. I can appreciate that there is airflow through the bay so the block will get cooled to some extent but it is nothing like the cooling given by the massive surface area/volume of a radiator with coolant right below the surface...
 

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My V6 sits around ~85ºC while on the move and can go up to ~100ºC in traffic. Thermostat is brand new and so is the rad, cooling system also works fine. As far as I can tell from other V6-ses, mine is pretty average.

What temperatures do you see? Do keep in mind the temperature guage is not the most accurate of instruments. The temperature sensor for the guage (the ECU has its own) is an NTC with a 1% accuracy, the gauge can have anything up to 15% I believe....

Cheers
Martijn
 

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Raytom it sounds like a classic case of a stuck open thermostat to me.

The fans are supposed to kick in at not much more than 90ºC

If your gauge is saying that when the fans cut in then there isn't a lot wrong with your gauge or sensor.

You will probably find the engine runs between 85 and 90ºC on the v6 in general running, may be a bit more but it may be slightly lower on TS cars if the stat is operating correctly.

Thermostat failures on all italian cars are very common. After owning 11 alfa's and 4 Fiats only 2 of them came to me with correctly operating thermostats.

This is where the stat is located on the V6 24 valve. It is held in with 3 bolts and a clip on the hose so dead easy to change.
 

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Whats the life span of a 'stat? I had mine fitted 11 months ago, and it runs at 60 - 70 degrees, and up to 90 in traffic.
 

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I have no idea what the life span is and I woudl imagine it is subject to huge variability in the order of

It may be duff when you get it
all the way to
Will not need changing in 150,000 miles.

The problem is so widespread in these cars that people consider temperatures of 70 or so on the motorway to be normal. Just because it is normal does not mean that it is correct :)

Poor form from the manufacturers but they seem to have gotten away with it pretty well...
 

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Discussion Starter #15
that was exactly my thought symonh2000 so i changed it on sunday and still had the same reading after the swap.....i was wondering if it could have been a dodgy stat......they are pretty cheap so i might just buy another and try it again.....
 

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where is the sensor situated on the v6 ?
Temperature sensor for the guage is located near the thermostat on the side of the engine. See below picture, you look down into the engine (you can recognise the coolant reservoir) and the air intake towards the intake manifold is removed.

Cheers
Martijn
 

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looks like i need to buy a new thermostat as well, mine doesnt really go above 60 degrees, which I have only noticed last night after reading on here.... and thats on a 15-20miles run on mixed motorway and A roads, so not good.

Who's the best supplier? will need to be mail order as I dont think there are any specialist near Hinckley.

Regards
Gareth
 
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that was exactly my thought symonh2000 so i changed it on sunday and still had the same reading after the swap.....i was wondering if it could have been a dodgy stat......they are pretty cheap so i might just buy another and try it again.....
Same here. Old thermostat was obviously not closing fully, but the engine now only runs a little warmer (at an indicated 80 - 85) with a brand new stat. I assume that my gauge just under reads a little.
 

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My V6 on a normal commute to work, say 5 miles or so will not get warm at all. On a gentle run on the motorway and back at night the temperature hardly moved at all. Yet when I have a bit of a play down some back roads the temp goes up to 90, fan cuts in and it controls the temp. Does this sound like a thermostat problem?
 
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