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Old December 18th, 2010, 07:10   #16
PDJetta
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Originally Posted by Vince Waldon View Post
The coolant plugs don't come on until after the engine starts, and only if ambient is below about -5C *and* coolant temp is low as well (haven't quite determined what value...every drive to work is a new experiment!). Only one coolant plug comes on (first coolant plug relay which is connected to only one plug) if the glowplugs are also running (probably to save load on the alternator) and then as soon as the glow plug after-run is complete the other two coolant plugs come on via the second coolant plug relay. They stay on till the coolant hits 50C.
Perhaps this is why when I started my car at 23 degrees F it seemed to warm up about 8 minutes faster (as determined by the pointer in the temp guage at 190 degrees) than when I started it at 33 degrees F on my drive home from work the past two days.

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Old December 18th, 2010, 07:15   #17
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Some nice creative dash mods there Vince. Good use of o-ring material around the SG. Do the toggles control the GPs, or just the indicator leds??
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Old December 18th, 2010, 12:02   #18
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Originally Posted by Vince Waldon View Post
The coolant plugs don't come on until after the engine starts, and only if ambient is below about -5C *and* coolant temp is low as well (haven't quite determined what value...every drive to work is a new experiment!). Only one coolant plug comes on (first coolant plug relay which is connected to only one plug) if the glowplugs are also running (probably to save load on the alternator) and then as soon as the glow plug after-run is complete the other two coolant plugs come on via the second coolant plug relay. They stay on till the coolant hits 50C.
....and the coolant glowplugs cut off below a certain RPM. For some reason, 2200 RPM comes to mind, but may be wrong. In any case, they do not function at idle.
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Old December 18th, 2010, 12:09   #19
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....and the coolant glowplugs cut off below a certain RPM. For some reason, 2200 RPM comes to mind, but may be wrong. In any case, they do not function at idle.
They do function at idle. My PD's coolant glow plugs were. You can hear the engine change tone when I unplugged them due to the load change. All three were working when I did the test.
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Old December 18th, 2010, 13:09   #20
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....and the coolant glowplugs cut off below a certain RPM. For some reason, 2200 RPM comes to mind, but may be wrong. In any case, they do not function at idle.
Cylinder glow plugs turn off above 2500 rpm. There's no low rpm cut off for either cylinder or coolant plugs.

Disconnecting the coolant glow plugs is often a way of stopping the cold idle squeal from a failing harmonic damper. The added alternator load (from coolant heater consumption) makes more resistance on it's drive belt. Sometimes lessening the alternator load is enough to stop the damper from slipping and squealing.
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Old December 18th, 2010, 13:13   #21
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can someone please provide a link to where i can buy these coolant glowplugs for my bew?
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Old December 18th, 2010, 13:25   #22
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Some nice creative dash mods there Vince. Good use of o-ring material around the SG. Do the toggles control the GPs, or just the indicator leds??
Yeah, the o-ring's recycled from an oil change... perfect fit.

The switches are actually unrelated to the plugs... one controls whether the little LED gauge on the right is reading oil pressure or oil temperature, and the other turns on the brake lights... lots of tailgaters where I live.
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Old December 18th, 2010, 13:26   #23
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can someone please provide a link to where i can buy these coolant glowplugs for my bew?
Well, I thought IDparts.com had them, but the ones they list are for the ALH only, according to their listing. I thought they would have been the same for the BEW.

--Nate
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Old December 18th, 2010, 13:34   #24
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Originally Posted by PDJetta View Post
Perhaps this is why when I started my car at 23 degrees F it seemed to warm up about 8 minutes faster (as determined by the pointer in the temp guage at 190 degrees) than when I started it at 33 degrees F on my drive home from work the past two days.

--Nate
This guy ran a few tests and figured he got about 30% faster warmup to 50C:

http://forums.tdiclub.com/showthread...nt+warmup+time

Now that I have some lights I'll probably mess around with a manual override so that I can run 'em up to 60C etc... man... really need to get a life.
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Old December 18th, 2010, 18:22   #25
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Well, I thought IDparts.com had them, but the ones they list are for the ALH only, according to their listing. I thought they would have been the same for the BEW.

--Nate
I believe they are.
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Old December 18th, 2010, 21:13   #26
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I believe they are.
http://idparts.com/catalog/product_i...roducts_id=455

they are not. it clearly shows that they are for the ALH only..doesnt say anywhere about BEW.
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Old December 18th, 2010, 21:29   #27
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I don't know why the automatics don't have coolant GP's. Anyone?
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Old December 18th, 2010, 21:39   #28
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I don't know why the automatics don't have coolant GP's. Anyone?
IIRC they have a heat exchanger in the automatic transmission that scavenges waste transmission fluid heat to accomplish the same thing.
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Old December 18th, 2010, 21:42   #29
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I don't know why the automatics don't have coolant GP's. Anyone?
Because the automatic transmission produces more waste heat than three glow plugs running at full power.
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Old December 18th, 2010, 21:49   #30
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Quote:
Originally Posted by Vince Waldon View Post
IIRC they have a heat exchanger in the automatic transmission that scavenges waste transmission fluid heat to accomplish the same thing.
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Originally Posted by NarfBLAST View Post
Because the automatic transmission produces more waste heat than three glow plugs running at full power.
Oh okay, makes sense.
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