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Old 01-03-2009, 01:33 PM   #1 (permalink)
X-Frenchy: very
 
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Join Date: Jun 2008
Location: Toulouse, France
Posts: 595

scenic - '01 renault scenic
90 day: 43.09 mpg (US)

megane - '97 renault megane classic
Diesel
90 day: 72.53 mpg (US)

dennisius - '06 Toyota Prius
Team Toyota
90 day: 69.27 mpg (US)
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I have heaters in my cars (diesel) without knowing it

After a search for a block heater available in France, I talked about it to a mechanic. He told me that not too old Renault has one by default. I was very surprised and asked him if it is a block heater with an outlet plug. This time he was astonished and described it to me.

The heater is 4 plugs in the cooling circuit. It lights on when the water temp is <75°C (167°F) and air temp is <7°C (45°F). The first plug lights when the ICE is started and following plugs are lighted at 20, 40 & 60 seconds. The battery voltage has to be >13V and the RPM has to be >650. I verified in a 3rd part manual that my newer car, 2001 dCi (common rail turbo diesel), has such a heater.

In the 3rd part manual for my older car, 1997 dT (turbo diesel), no such heater is described. After a quick search another kind of heater is present : the fuel heater. The fuel heater is near the fuel filter and lights on when the fuel temp is < 8°C (46°F). This heater is 150W.

In both manuals is described the use of the glow plugs during the first minutes after ICE starting. Normally in a diesel, the glow plugs lights on when you turn the key on II before the ICE is started. The post-heating lasts 20 seconds max and stops when the ICE temp is 30°C (86°F) :
  • =20 seconds when ICE temp is <-20°C (-4°F)
  • <20 seconds when ICE temp is -20 to 0°C (32°F)
  • =5 seconds when ICE temp is 0 to 20°C (68°F)
  • <5 seconds when ICE temp is >20°C
For information the pre-heating (before ICE start) stops when the ICE temp is 30°C and lights on :
  • =12 seconds when ICE temp is <-30°C (-22°F)
  • 3 to 8 seconds when ICE temp is -20 to 0°C
  • 1 to 3 seconds when ICE temp is 0 to 20°C
  • =1 second when ICE temp is >20°C

Denis.

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Best Mégane tank: 1268.9mi @ 77.847 MPG(US)
2008/06-2011/10 saving:
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megane : thread - kill switch.
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