82° thermostat? who's doing this and has it worked out for the long run?

[shayne86]

So after a few weeks with the new 04 v8 and trying to get my head around the sheer amount of heat these motors generate. I've taken a plunge & ordered an 82° thermostat to try.

Yes i know these threads exists but the majority of them are circa 2012.

Ide like to hear from people who have done this and are still running this mod. Or even those who did it and went back to factory.

What has peoples experiences been in the long term running the slightly cooler 82° thermostat?

Ill be going for a beach run next r&r and ide be lying if i said i wasnt somewhat stressing big time about the temps and heat that comes off these motors. Even under normal town driving conditions, it blows my mind.

I guess 9 years in a turbo diesel dual cab which could be thrashed up and down a beach for days without breaking a sweet might be somewhat to blame for my worries.

Im keen to hear anyone's feedback on this.

Cheers everyone [emoji106]

[ozscott]

Still running a low temp inline top hose thermostat mate. 4.6 V8 D2. Still works well but in Winter the heater isn't what it was [emoji1787]

[Tins]

How much heat are you talking about? What makes you think it's any hotter than your TD dual cab? Do you have a proper temp gauge, or is it a perception thing? If you've only had the car a few weeks, have you had the cooling system checked?
For example, my son's TD42 Patrol generates far greater underbonnet temps than my TD5 Disco.... or so it seems. An accurate temp reading might surprise you. Or, of course, you may be right and it is hot. if it is there is possibly something wrong with it.

[shayne86]

How much heat are you talking about? What makes you think it's any hotter than your TD dual cab? Do you have a proper temp gauge, or is it a perception thing? If you've only had the car a few weeks, have you had the cooling system checked?
For example, my son's TD42 Patrol generates far greater underbonnet temps than my TD5 Disco.... or so it seems. An accurate temp reading might surprise you. Or, of course, you may be right and it is hot. if it is there is possibly something wrong with it.Because i could touch the panels and bonnet on my dual cab without being burned. The ute also didn't take an hour to cool down afterwards. Yes i know you couldn't get any more of a polar opposite than a cast iron turbo diesel to an ally petrol v8. But just seems odd to me. No i haven't had a chance to get the cooling system inspected yet.

I have an obd2 wireless scanner coming so i can get an accurate read on the temp before i do change anything.

Will be flushing the coolant anyways this r&r.

[shayne86]

I might add that the car does have a mostly full service history and the temp gauge never goes above half and comes up to temp fairly quick. It is high milage though at 270,000kms.

[Tins]

I might add that the car does have a mostly full service history and the temp gauge never goes above half and comes up to temp fairly quick. It is high milage though at 270,000kms.

It won't take you long to work out that the factory gauge is a hopeless liar and is not to be trusted. It is an idiot light at best. Fit a proper one ASAP.

[shayne86]

It won't take you long to work out that the factory gauge is a hopeless liar and is not to be trusted. It is an idiot light at best. Fit a proper one ASAP.Yeah i have read that a lot [emoji1787]

[AK83]

.... and the temp gauge never goes above half and comes up to temp fairly quick. ....

This means zero!
The OBDII scanner thing will show you actual temps.

My V8('00 model) temp gauge really only shows anything above half way once coolant temp is in the 115°C (IIRC .. maybe more!) temp range.
Mine had a huge cooling problem, which I thought I solved(but turned out to be a major block shattering issue).
So my experience with seriously overheating V8's dash gauges OBDII dongles and freebie software was eye opening.

My understanding of modern vehicles tho is that most coolant temp gauges work similarly .. they just show the 'unaware' that everything is fine, and once the problem has already happened, only then will the gauge alert this 'unwary' driver that there is a problem.
My brother had the same issue in his '00 Patrol(petrol) where the gauge only showed the coolant getting hot, AFTER the steam was billowing out the bonnet.

To date, only car I can recall that has an actual temperature gauge that shows actual temps ... in the dash cluster .. is the Peugeot 307 HDi.
My dad has one, and he's forever complaining that it goes up and down, up and down, he seems to think that when it goes up, it's overheating!

I go through this repetitive routine, pretty much, every week with him(he's old .. maybe suffering memory loss).

I used to see actual temps in the brothers(now gone) Iveco Stralis too. Cruising .. would show whatever cool normal temp, hard up a long hill, it'd heat a bit(as you'd expect) .. and coolant temps would rise .. gauge would show you this, viscous fan would start to roar.

But just to reassure you .. your "never goes above half" gauge means coolant temp could be between about 60(-ish) and 115(-ish) °C

[ozscott]

The D2 V8 runs too hot. The cooler thermostat is kinder to the block. Cheers

[shayne86]

AK83, yeah i had an obd2 scanner and the torque app in my Colorado. Thing was amazing! I had a custom 9 inch display with coolant temp, boost, engine load, egr, intake temp, manifold temp, fuel rail pressure, fuel flow, fuel temp..... more gauges than you could poke a stick at.

The coolant temp was interesting though. So the cars factory gauge would run on the first quarter mark for day to day running. This equated to about 81° on the obd2.
A jump on the cars gauge from quarter to half was only a water temp increase of about 5-6°! I never saw anything over half way on the gauge or 87° on the obd2.

[shayne86]

The D2 V8 runs too hot. The cooler thermostat is kinder to the block. CheersYeah im starting to get this impression.

Since posting this ive stumbled across a south African land rover forum with a lot of people saying the same thing I've said in the original post. Maybe I'm just stressing over nothing? But the obd2 scanner will be the tell all.

[ozscott]

Yep mate. With stock 3 way thermostat in Qld they sit on 90 to 95 most of the time and 103 to 105 in low range and higher offroad. Crazy. Cheers

[shayne86]

Yep mate. With stock 3 way thermostat in Qld they sit on 90 to 95 most of the time and 103 to 105 in low range and higher offroad. Crazy. CheersYeah I'm over here in WA so plenty of coastline to really work the ol girl. I don't really want to end up with a cooked motor in the middle of nowhere

[trout1105]

My D2a V8 runs much hotter than the V8 in my 79 Series But after fitting the 82C thermostat and a bit of a modification on the grill the D2a seems to run a lot cooler than it did before So a [thumbsupbig] for the 82C unit from me.
As said by others the factory temp gauge is a complete waste of space on the dash and an OBD2 unit will give you an accurate reading, Also a low coolant alarm is a great idea for these engines as well.

The 4l V8 also has a well known issue with the head gaskets which is another common cause of overheating and at 270K this could be what is causing your overheating problems and they may need to be replaced.

[Pedro_The_Swift]

2012 huh,, I wonder what has changed in a D2 cooling system since then,,
oh right!
Nothing! [bighmmm][tonguewink]

buy a genuine one, take pics before hand, (I doubt an RV8 has lasted this long without someone replacing the hoses, but now would be the time..) use GREEN coolant, test your engine fan, use that OBD2 dongle to check O2 sensors are working, STFT's are moving, and the MAF is in range.

[biggin]

I didn’t think twice about installing a 78C thermostat in my new(second hand) 4.6L after the block split at 178k in my 4.0L.
She cruises at 85-87 and up to 97 when things get a bit more difficult.
I wouldn’t want to see it get any hotter than that.

[shayne86]

2012 huh,, I wonder what has changed in a D2 cooling system since then,,
oh right!
Nothing! [bighmmm][tonguewink]

buy a genuine one, take pics before hand, (I doubt an RV8 has lasted this long without someone replacing the hoses, but now would be the time..) use GREEN coolant, test your engine fan, use that OBD2 dongle to check O2 sensors are working, STFT's are moving, and the MAF is in range.Want to give me the short & sharp run down on why to change it to green coolant? Something to do with not finding its way out of every nook and cranny like the red OAT stuff? (Spewin as i have new red penrite stuff to go in [emoji1787])

Also, the new thermostat is a genuine LR unit, just the one Freelander one with the lighter spring.

[Tins]

Yeah i have read that a lot [emoji1787]

Believe it mate. Believe it.:bat:

[AK83]

.... Something to do with not finding its way out of every nook and cranny like the red OAT stuff? (Spewin as i have new red penrite stuff to go in [emoji1787])

....

Penrite list the Blue coolant product as the correct type for LR vehicles in this age range(both V8 and Td5).

Dunno why?

A few years ago when I bought my 20lt drum tho, they listed the red stuff(G40) as the appropriate product.
This is why I bought it.
But later checking of their website shows they changed at some point from the Red (G40) product to the Blue (G30) product.

I dunno what the previous owners had in brothers Td5, but it was green and one can assume that it wasn't OAT coolant .. just something that looked green, and probably the cheaest they could get their hands on.

Anyhow, we flushed it out flushed it again, added the Red stuff I now have (way too much of!) .. and it dutifully began it's process of elimination .. as you said, found it's way to every nook and cranny it could escape from.
Waterpump, fuel cooler, a few hoses ... etc. All fixed and now a few years later, all good.

[James NZ]

Hi,

I have the PEM101020 82° hard spring thermostat fitted and it works fine. These are still available from John Craddock according to their website.

Cheers

[shayne86]

Penrite list the Blue coolant product as the correct type for LR vehicles in this age range(both V8 and Td5).

Dunno why?


You're 100% correct! Good find.

[shayne86]

Believe it mate. Believe it.:bat:Hence why i ordered a wireless obd2 scanner.
Worked an absolute treat in the dual cab. The Colorado gauge would go from a quarter to a half (looked terrible when you saw it) but in reality was only 4 or 5 degrees.

[Pedro_The_Swift]

Want to give me the short & sharp run down on why to change it to green coolant? Something to do with not finding its way out of every nook and cranny like the red OAT stuff? (Spewin as i have new red penrite stuff to go in [emoji1787])
.

all the other colours are for dissimilar metal motors,, LR did this, used longer service intervals, and went to "Lifetime" trans servicing to carry less SKU's.

[au.shammus]

Recently on my D2A V8 I have replaced the hoses, the Radiator, the overflow bottle and standard thermostat, on a run from Parramatta to the northern beaches my odb scanner was showing the temp sitting at 100 deg C pretty consistently, a week ago I put in a 82 deg thermostat from Mario and have just done Sydney - Coffs ( Good Friday traffic) - Ipswich (via summer land way) - Tamworth, so far the temp had been sitting between 94-96 on the hilly bits, given what most have been saying this seems still a bit hot, should I be changing water pump as well?

Owen
SILVER S2A S Classic

[Robflocar]

I have had my V8 modified to stop the hot water returning to the motor except via the heater pipe. If you notice there is a large hose that just returns the hot water straight back into the engine. Mine was running at 104 degrees in the city. The factory gauage is useless. The modification includes a digital gauge in the coin tray area. It also includes a larger hose to the radiator with an 82 degree thermostate fitted. My temperature has never been over 84 ever since. The explanation for the high temperature is to meet emmision level requirements in Europe. These cars are so old now that the emission levels will be up the creek by now anyhow. Get rid of the pipe sending hot water straight back to the motor. Fit a new thermostate in line to the radiator.

[shayne86]

Quick update for anyone who is interested.


When i picked up this car i knew they ran warn but after a short town run i couldn't even touch the bonnet or quarter panels they were that hot. So did some homework and made a few changes....

-installed an 82° thermostat
-flushed system and put in penrite blue OAT coolant
-got t the electric thermo fan running
-new viscous hub installed
-obd2 plug in to get live info including accurate temps

So far all i can say is WOW, what a difference! Temp never goes over 90° even today in low range for a good hour up and down hills. Same thing for sitting in traffic. On the move it drops to an average of 85° give or take a degree or so. That heat soak has all but gone, can touch car panels now even after a few hours of running.

Starting to really love this old bus [emoji16] https://uploads.tapatalk-cdn.com/20210413/db779b63180e4bd562da6f220c1a87aa.jpghttps://uploads.tapatalk-cdn.com/20210413/67037b4e7a26314c14d6bcadee3847cd.jpghttps://uploads.tapatalk-cdn.com/20210413/429f5b0caed7b6668297b571c2340ddc.jpghttps://uploads.tapatalk-cdn.com/20210413/ff6ae9d9df6c0586edc5fd2cf635f571.jpg