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brightondefender



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

2010 Defender 90 Puma 2.4 XS CSW Alaska White
Heating System / Temp Gauge Prob
Hi, just joined the forum but been reading it for a while now.

I have an 07 Defender. If I leave the engine idling for any amount of time the temperature gauge drops back down to cold and the heaters blow cold. I have also noticed that it seems to take quite a while to reach operating temperature, and it will never heat up if its left standing and running.

Does anyone have any idea what the problem may be?

Many thanks for any help!
Post #115420 14th Jan 2012 7:45pm
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pom



Member Since: 01 Jun 2010
Location: Worcester
Posts: 1343

whats the ambient temperature when it does this ?

Pom
Post #115424 14th Jan 2012 7:53pm
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robpenrose



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

United Kingdom 
I doubt it's a problem. My Td5 does the same this time of year.

Mine has a viscous fan, so it's constantly sucking the air through, this time of year is cold.

I'm sure some of the Tdci chaps will confirm similar soon... Current:D4 HSE
Gone: BMW Z4MC
Gone: Defender TD5 90 CSW
Previous: Discovery TD5 ES (Gone)
Post #115425 14th Jan 2012 7:54pm
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brightondefender



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

2010 Defender 90 Puma 2.4 XS CSW Alaska White
pom wrote:
whats the ambient temperature when it does this ?

Pom


Its always the same no matter what the outside temp is. I have not had the Defender long, I would say the warmest has been 14 and the coldest -2.
Post #115426 14th Jan 2012 7:55pm
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robpenrose



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

United Kingdom 
What type of journeys do you do?

Short around town etc or motorway etc. what's your average journey time?? Current:D4 HSE
Gone: BMW Z4MC
Gone: Defender TD5 90 CSW
Previous: Discovery TD5 ES (Gone)
Post #115427 14th Jan 2012 7:57pm
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brightondefender



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

2010 Defender 90 Puma 2.4 XS CSW Alaska White
robpenrose wrote:
What type of journeys do you do?

Short around town etc or motorway etc. what's your average journey time??


I do a mixture, but mainly to work and back which is about 5 miles
Post #115428 14th Jan 2012 7:59pm
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T1G UP



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

England 2011 Defender 110 Puma 2.4 XS CSW Orkney Grey
Re: Heating System / Temp Gauge Prob
brightondefender wrote:
Hi, just joined the forum but been reading it for a while now.

I have an 07 Defender. If I leave the engine idling for any amount of time the temperature gauge drops back down to cold and the heaters blow cold. I have also noticed that it seems to take quite a while to reach operating temperature, and it will never heat up if its left standing and running.

Does anyone have any idea what the problem may be?

Many thanks for any help!

stat stuck open and or viscous fan stuck on. does the temp drop on a run?
Post #115430 14th Jan 2012 8:00pm
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brightondefender



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

2010 Defender 90 Puma 2.4 XS CSW Alaska White
Re: Heating System / Temp Gauge Prob
T1G UP wrote:
brightondefender wrote:
Hi, just joined the forum but been reading it for a while now.

I have an 07 Defender. If I leave the engine idling for any amount of time the temperature gauge drops back down to cold and the heaters blow cold. I have also noticed that it seems to take quite a while to reach operating temperature, and it will never heat up if its left standing and running.

Does anyone have any idea what the problem may be?

Many thanks for any help!

stat stuck open and or viscous fan stuck on. does the temp drop on a run?


no it never drops on a run, only when its left. for instance i left it running when i washed it the other day at asda, when i started it was at normal temp blowing hot air, and by the time i got back in the temp gauge was below the blue and blowing very cold air.
Post #115431 14th Jan 2012 8:02pm
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robpenrose



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

United Kingdom 
What was the air temp that day?

Mine massively depends on the air temp. In summer it stays at normal operating temp, but this time of year as in probably below 6 degrees it will drop. Current:D4 HSE
Gone: BMW Z4MC
Gone: Defender TD5 90 CSW
Previous: Discovery TD5 ES (Gone)
Post #115434 14th Jan 2012 8:05pm
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T1G UP



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

England 2011 Defender 110 Puma 2.4 XS CSW Orkney Grey
robpenrose wrote:
What was the air temp that day?

Mine massively depends on the air temp. In summer it stays at normal operating temp, but this time of year as in probably below 6 degrees it will drop.


it shouldn't Rob, the stat should close and keep the heat in the engine. take the fan off in the winter, i use to on my td5 90, great untill its about 15 degs then put back on
Post #115435 14th Jan 2012 8:08pm
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brightondefender



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

2010 Defender 90 Puma 2.4 XS CSW Alaska White
T1G UP wrote:
robpenrose wrote:
What was the air temp that day?

Mine massively depends on the air temp. In summer it stays at normal operating temp, but this time of year as in probably below 6 degrees it will drop.


it shouldn't Rob, the stat should close and keep the heat in the engine. take the fan off in the winter, i use to on my td5 90, great untill its about 15 degs then put back on


is the stat something thats easy to change?
Post #115438 14th Jan 2012 8:10pm
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T1G UP



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

England 2011 Defender 110 Puma 2.4 XS CSW Orkney Grey
not sure on a puma, but they can stick on any car. there usually about a fiver so worth an ask at your garage
Post #115440 14th Jan 2012 8:12pm
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robpenrose



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

United Kingdom 
T1G UP wrote:
robpenrose wrote:
What was the air temp that day?

Mine massively depends on the air temp. In summer it stays at normal operating temp, but this time of year as in probably below 6 degrees it will drop.


it shouldn't Rob, the stat should close and keep the heat in the engine. take the fan off in the winter, i use to on my td5 90, great untill its about 15 degs then put back on


I'm confident mine is fine, when I lived in the alps, it reacted to the cold in the same way the company Td5 did, and even now, my mates 110 does the same as mine. If we leave them running together after the same trip, they both drop after a while, and it's a fair while, not just a few minutes and it does have to be cold. But yeah, taking the fan off would be a good idea, but normally I do Dualcarriage way driving, so leaving it on is ok.

Having the heater on takes alot of heat from the engine too. Current:D4 HSE
Gone: BMW Z4MC
Gone: Defender TD5 90 CSW
Previous: Discovery TD5 ES (Gone)
Post #115449 14th Jan 2012 8:40pm
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Zagato
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Member Since: 08 Jan 2011
Location: Billingshurst West Sussex
Posts: 5013

United Kingdom 
I don't know if this helps but I'm not sure the Puma will heat up significantly inside the cabin if left ticking over from a cold start up, it would take a loooooong time if it does and you would need air-con on or blower on. There was a few posts on this recently. My SAAB is the same you can leave it 30 mins outside ticking over in cold weather but the temp gauge will only just be off the bottom!

TIG's right, the thermostat should do it's job but if it's just ticking over is much hot water passing around the engine into the heating system as it closes down. I don't know Confused
Post #115527 15th Jan 2012 8:58am
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Retroanaconda



Member Since: 04 Jan 2012
Location: Scotland
Posts: 2646

Scotland 
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.
Post #115542 15th Jan 2012 11:32am
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