[Vwdiesel] FW: tdi heat

[pmdolan at sasktel.net]

It is vitally important that the thermostat seals off the rad when cold 
(IMHO, the reason these are so variable and some are so bad).  Not 
only does the rad suck up heat like mad (being FAR more capacity than 
the heat exchanger in the interior), but flow down the heater line will 
also be lost. 

In places that are not really cold (below -20C = -4F) they ALL seem to 
work well enough.  Drop below that, however, and everything has to be 
"right" for a TDI to provide reasonable HVAC performance. 

On Thu, 5 Jan 2012 17:56:33 -0800, Gerry Wolfe <GerryWolfe at shaw.ca> wrote:
Not sure about the 14F issue to start the coolant glowplug, at least on my
> '97 Jetta TDI, it rarely gets that cold on Vancouver Island.  However, I get
> lots of interior heat within a minute or so of starting up, long before the
> temp gauge even starts to move, at temps well above freezing. 
>
> Side issue: temp gauge rarely got above 1/4 level, only hit 1/2 way when
> under big load.  Had the thermostat replaced this fall with antifreeze
> change, and now it quickly goes to 1/2 way and doesn't budge, come hell or
> high mountains.  I am assuming that being stuck open (and always running
> thru the rad) negated whatever the coolant glowplugs were doing. 
>
> rgds, g. 
>
> -----Original Message-----
> From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
> Behalf Of Chris Geiser
> Sent: January-05-12 4:10 PM
> To: Vwdiesel
> Subject: Re: [Vwdiesel] tdi heat
>
> So after the responses here, I've been reading more about the coolant glow
> plugs - sounds like they may not be working (04 Jetta BEW - manual
> tranny).  The next time it gets cold, I'll check if there's current to the
> plugs - from what I read, coolant glow plug system only comes on when below
> 14 F (and we're in a heat wave now with +40 predicted for tomorrow). 
>
> Also - If I put an Ohmmeter on the positive post and on the block, what
> should the resistance be if plugs are good / bad?  Seems to me I remember
> that being a legitimate way to check them if not powered by a common bar,
> or if I disconnect the bar?
>
> TIA again!!
>
> CG
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