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robpenrose

Member Since: 15 Jan 2011
Location: Hampshire or Cornwall
Posts: 338

Retroanaconda wrote:
You'll probably find that the cabin heater is able to cool the engine at a greater rate than the engine can produce heat at tick over.

My 200Tdi is the same, if you leave it ticking over for a long period of time it will cool down a bit. It won't go stone cold, but the heat extraction is likely a bit less efficient than on a Puma heater.

If the thermostat is working correctly then the main radiator, and any fan pulling air through it, shouldn't have any effect on the running temperature. The cabin heater matrix of course is permanently in the cooling loop, so that's where your heat is going. I bet if you turned the heater off the engine would stay warm for longer on the gauge.

Thats exactly what happens to my Td5.

Maybe i should have been clearer and said when the heater is blowing full on hot. Obviously in the summer, its the A/C thats on, so thats further load on the engine so it should stay at operating temp... Current:D4 HSE
Gone: BMW Z4MC
Gone: Defender TD5 90 CSW
Previous: Discovery TD5 ES (Gone)

15th Jan 2012 11:44am

brightondefender

Member Since: 14 Jan 2012
Location: East Sussex
Posts: 97

2010 Defender 90 Puma 2.4 XS CSW Alaska White

thanks for everyones help, I think I will get the stat changed just to be sure - getting bloody cold out there now and need my heat!!

thanks again

15th Jan 2012 4:40pm

bpman

Member Since: 21 May 2008
Location: Oslo
Posts: 8069

2008 Defender 110 Puma 2.4 SVX Station Wagon Santorini Black

if that's the case ... have a look at the radiator muff thread

15th Jan 2012 6:22pm

T1G UP

Member Since: 08 Dec 2009
Location: Bath
Posts: 3101

2011 Defender 110 Puma 2.4 XS CSW Orkney Grey

never had this problem in my old 200 or td5?

You can also try a wing scoop as that pushes more air through once its warm it helps the blower.

Rad muff, remove fan, check stat, fit wing scoop

15th Jan 2012 6:27pm

Tjhappel

Member Since: 08 Aug 2012
Location: Southern California
Posts: 32

2010 Defender 110 Puma 2.4 XS CSW Santorini Black

I know this is an old post but I had the same problem in N. America/Canada last winter in my puma. After changing several thermostats and several other misc items I ended up taking off my viscous fan and installing an electric fan. Problem solved in winter however it took me awhile to sort a fan with enough cfm's in the summer. All good now!

18th Sep 2012 12:15am

tatra805

Member Since: 16 Aug 2011
Location: Dolany
Posts: 436

2008 Defender 110 Puma 2.4 CSW Bonatti Grey

another vote for "normal behavior"

Cooling systems are over dimensioned for the engine to cope with all possible situations.

This is also the reason for electrical or fuel driven additional heaters on many luxury cars these days, especially on bigger engines which need even more power to heat up to normal op temps.

All cars here drop to low within minutes during winter.

2cents

18th Sep 2012 9:05am

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