I know it’s getting colder but the engine is taking a long time to reach operating temperature and the FBH is active seemingly trying to get it back up to temps even when warmed up. Not seen many issues with thermostats on these. What temps should these run at normally? 2012 TDV8 Vogue (L322)

Define long time? Around town in the cold, at low revs, a big heavy stainless V8 block takes a while to get up to operating temperature. For comparison, I'd say mine probably takes 4-5 miles at town speeds, or in stop/start traffic, a good 10 minutes or more. It was similar with my C Classes - they took quite a while to warm up in cold weather.

If I'm heading a mile or two to the motorway, it will be up to temperature in just a few minutes. 2015 Range Rover Autobiography 4.4 SDV8

Yesterday it took 30 miles of A road and M-Way to get to temp from cold. Today in urban situation it was about 20mins. Once warmed up it runs about 72 deg in slow moving urban traffic, about 85 deg on steady M-Way sub 70mph cruise and a long uphill M-way drag it nudges 95. No fault codes. 2012 TDV8 Vogue (L322)

10 mins and heater is decently warming the cabin.

Temp seemed more stable today but still took a good 1/2 hr of urban driving to get up to 75deg. FBH running again and puffing out smoke from the OS wheel arch which is strange as I thought it was on the NS arch. According to the info the FBH cuts in when engine temps go under 75deg and mine runs under this unless on the m-way. Something doesn’t seem right? 2012 TDV8 Vogue (L322)

Broken plastic part holding thermostatic valve inside body. If You are handy ypu can try to fix it but the old overheated plastic is just weak. Replace thermostatic body. Just buy new. One used you already have.

JayGee wrote:

Yesterday it took 30 miles of A road and M-Way to get to temp from cold.

Seriously??

It's probably a smidgen colder (ambient) here than it will be with you and my 4.4 TDV8 will be completely warmed and up to temp within five or six miles.

Thirty miles is either a mis-strike on your keyboard, or you definitely have an issue. The older I get, the more I realise that people confuse wrinkles for wisdom

It does sound like there is a (too much) circulation issue - but, to get heat out, you have to put power in, if you drive at low revs with little energy being transferred into heat, I recall the OP stating that he drives at less than ~2500rpm most of the time so the second turbo doesn't have to spool up. That sort of driving isn't going to help.

JMC wrote:

JayGee wrote:

Yesterday it took 30 miles of A road and M-Way to get to temp from cold.

Seriously??

It's probably a smidgen colder (ambient) here than it will be with you and my 4.4 TDV8 will be completely warmed and up to temp within five or six miles.

Thirty miles is either a mis-strike on your keyboard, or you definitely have an issue.

Phoenix wrote:

It does sound like there is a (too much) circulation issue - but, to get heat out, you have to put power in, if you drive at low revs with little energy being transferred into heat, I recall the OP stating that he drives at less than ~2500rpm most of the time so the second turbo doesn't have to spool up. That sort of driving isn't going to help.

You've answered it yourself, increase the load, a lightly loaded engine won't warm up quickly.

JayGee wrote:

Thirty miles is correct.

When I start my car from cold, I certainly don't rev the nuts off it. My five or six miles is one mile to the dual carriageway and then four or five miles at under 2000rpm.

Could it be as simple as a thermostat that's stuck fully open?  The older I get, the more I realise that people confuse wrinkles for wisdom

jimmie wrote:

Broken plastic part holding thermostatic valve inside body. If You are handy you can try to fix it but the old overheated plastic is just weak. Replace thermostatic body.

@JayGee

I checked mine today. With town driving, it took 12 minutes to get up to operating temperature. I'll plug in my IID and get you a coolant and oil temperature tomorrow for comparison. 2015 Range Rover Autobiography 4.4 SDV8

Mine runs warm enough ( 85ish deg) on the M-Way to regen OK (watched it yesterday) and was even doing some passive regeneration. The slow warm up and the engine temp running <75deg in on light load/ urban driving just seems wrong and I'd also suspect the thermostat from this behaviour. The fan has stopped spooling up for a few seconds while driving away but not sure what to make of this? Would be grateful for some running temps from the GAP IID tool from other owners. Temp needle hits midway at around 75deg which still seems low. Oil temp lags behind coolant for a while which is to be expected. 2012 TDV8 Vogue (L322)