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Cold Weather / Winter Grille Screen

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Wed Dec 17 2014, 02:05pm
Member No: #17929
Joined: Feb 08 2011
Location: West Sussex
Citroën recommends the fitting of a 'Snow-Guard' or cold weather grille screen when the temperature remains at or below +10°C for long periods. - Click Here -

One of the worries, when fitted, is what the actual Engine Coolant Temperature is, in case it overheats.

Today I fitted the 7429.K2 Bumper Plug to my C4 II Exclusive 1.6 e-Hdi Manual. In addition, I also temporary fitted my UltraGauge (works via the OBD II port) - Click Here - to initially monitor Engine Coolant Temperature. Once I have decided on the best position for the “Display”, I hope to post how I fitted it properly.
Should anyone wonder about the Engine Coolant overheating when the ambient temperature is around 12/13°C, mine never went above a maximum of 84°C. This was when driving both on twisty back roads and motorway.
Wed Dec 17 2014, 03:08pm

Member No: #19238
Joined: Apr 12 2011
Location: Cambridgeshire
We used one on our Picasso and it never caused an issue on warmer days.
Grumpy GrandPa   
Wed Dec 17 2014, 03:51pm
Member No: #10746
Joined: Aug 28 2009
Location: Hull: UK City of Culture 2017
Never had a problem with mine on C4.
Had it on for months in 4 previous winters
Never got above 3 blocks on the temp gauge
Wed Dec 17 2014, 04:31pm
Member No: #17929
Joined: Feb 08 2011
Location: West Sussex
Wish there was a temperature gauge on the new C4 II Exclusive 1.6 e-HDi. Unfortunately, there is only a fixed red warning light that comes on when the temperature of the cooling system is already too high.
Wed Dec 17 2014, 05:43pm

Member No: #82
Joined: Jan 22 2007
Location: Hoylake
Citroën recommend the winter grille screen is removed once the ambient temperature goes above 15°C. Its other purpose is to prevent snow from entering the under bonnet space and bunging up airflow to the radiator and air intake.

It was essential on my old 2CV.
trev h   
Thu Dec 18 2014, 03:36am
Member No: #10864
Joined: Sep 11 2009
Location: kent/se london
Forgot to take mine off this year till late august, never made any difference to the engine temp, always stayed around the 76° mark.
Thu Dec 18 2014, 05:48am
Member No: #17929
Joined: Feb 08 2011
Location: West Sussex
My thoughts were to leave it on as long as possible, whilst monitoring the temperature gauge. On the UltraGauge I fitted, you can preset an alarm to go off at any temperature you choose.
Thu Dec 18 2014, 09:31am
Member No: #25579
Joined: May 06 2012
Location: Co.Tyrone, NI
I have mine on a couple of weeks now.
Cant tell if the engine gets any hotter with it on as there is no temp gauge on my Grand Picasso.
Thu Dec 18 2014, 09:41am

Member No: #82
Joined: Jan 22 2007
Location: Hoylake
cooter wrote ...

I have mine on a couple of weeks now.
Cant tell if the engine gets any hotter with it on as there is no temp gauge on my Grand Picasso.

The engine should warm up more quickly though, and the temperature maintained more effectively, so reducing fuel consumption.
Mon Dec 22 2014, 03:33am
Member No: #135
Joined: Feb 25 2007
Location: South Midlands
My so called winter grille has been on for 9 years.

Has never overheated as a result of it being left on all year.

It never gets warm enough in the UK.
Mon Dec 22 2014, 04:04am
Member No: #24127
Joined: Feb 05 2012
Location: Bexhill on Sea
I've had mine on for a Month, but it doesn't seem to make much difference to how soon it heats up. The VTS 180 warms up pretty quickly anyway. I also left it on until well into the summer & again no difference noticed.
Tue Apr 28 2015, 03:37am
Member No: #40167
Joined: Apr 17 2015
Location: stoke
Where can I buy one of these for a DS4 in the UK? Just want to get it now ready for next winter before I forget
Tue Apr 28 2015, 03:49am

Member No: #1
Joined: Aug 07 2006
Location: Northumberland
Your local dealer.
Tue Apr 28 2015, 08:59am

Member No: #82
Joined: Jan 22 2007
Location: Hoylake
Its other function is as a snow guard - to stop snow going into the engine bay.
Wed Jun 17 2015, 11:48am

Member No: #8137
Joined: Mar 08 2009
Location: Kent, UK
Last year I hooked up the OBD reader and took a run before MOT time to check exhaust gases. Despite the weather shield being in place and an air temperature of 17C to 18C the coolant temperature wobbled between 90C and 93C as the thermostat opened and closed. It was only after a motorway gallop and a stop on a roundabout atop a slip road that it got to 94C.

The HDI engine is very efficient and provides little waste heat so under most conditions it is too cool. It's about time Citroen started putting automatic shutters on the grills like some Ford models.

If you have a model without a temperature gauge then a cheap ELM wifi OBD2 device and a smartphone will give you all the gauges you want!

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