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Old 11-12-2018, 08:21 PM   #31
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Default Re: Heater Booster (Not Auxiliary Heater)

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Originally Posted by autostaretx View Post
So, when the engine is running (because the Boost only works with the engine on),
does pushing the "bow tie" of the right heater control set cause the tiny red LED to light up (it's in the ring to the left of the bow tie, right above/below the grid-with-wiggles white symbol)

--dick
It does but it is does nothing
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Old 11-12-2018, 10:06 PM   #32
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Default Re: Heater Booster (Not Auxiliary Heater)

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To remove the resistor from the plenum you first squeeze the tab, then slide the resistor sideways into the gap the tab’s base fills. This movement aligns the wedges on the resistor with slots in the plenum opening and the resistor can be lifted clear.

-dave
THAnk you very much. I just replaced the entire part...the local shop had one in stock and Radio shack closed out this way.... or I would have just fixed the fuse.

We now have a fully functioning fan and we appreciate it. The last trip was feast or famine as far as heat was concerned. Lol

So back to the bow tie button for aux heat. It has the A/C control, aux heat and rest. If I choose the rest function does the espar continue to run??

Also, I’m actually thinking that hard wiring it to a switch may be best for us. It certainly won’t be our primary heat source however we are out here in ND... it gets pretty cold and I feel like it may not be a bad idea to have that little fella working on its own.
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Old 11-12-2018, 10:18 PM   #33
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Default Re: Heater Booster (Not Auxiliary Heater)

Failed resistor packs are sometimes caused by plugged cabin air filters, or blower motors that are dragging (bushings need lube).
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Old 11-12-2018, 10:45 PM   #34
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Default Re: Heater Booster (Not Auxiliary Heater)

My lists don't seem to have uploaded from my phone.

I wanted to thank everyone for their help.

I changed the blower resistor(radio shack no longer exists by me if I'd have soldered a new fuse on) so my fan is functioning now.

I will be pulling the headlight out tomorrow for a quick/thorough spray down with some motor cleaners and lube... hopefully that works. Am I understanding that even if I do get her free that the aux heater won't fire as it's faulted too many time?
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Old 11-12-2018, 11:10 PM   #35
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Default Re: Heater Booster (Not Auxiliary Heater)

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Originally Posted by Stareyedirish View Post
So back to the bow tie button for aux heat. It has the A/C control, aux heat and rest. If I choose the rest function does the espar continue to run??
No.

All REST does is turn on the electric coolant circulation pump (and cabin fan) so that "residual heat" (after you've turned off the engine) can be extracted to keep the cabin warm for another 15 minutes.

At least your response tells us that the Bow Tie switch is being *sensed*, and we can move further into diagnostics. There is a difference between "does nothing" and "LED comes on, but espar doesn't". When you turn ON the bow tie/LED, can you hear a faint "tick tick" from (more or less) under the driver's seat (it's really under the Sprinter) ... that would be the fuel pump for the heater being triggered.

Have you downloaded the service manual and looked at the wiring for the heater?
(the Aux heater and the Boost heater are pretty much the same ... except the Boost doesn't have the 7-day timer or separate Aux switch).

2006 service manual: http://diysprinter.co.uk/reference/2006-VA-SM.pdf
2003 service manual: http://www.diysprinter.co.uk/referen...e%20manual.pdf
(although the heating section should be the same)
The heater is also described in the "body" book: http://www.diysprinter.co.uk/reference/2004-VA-Body.pdf
...among others at http://www.diysprinter.co.uk/reference/

--dick
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Old 11-13-2018, 01:44 AM   #36
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Default Re: Heater Booster (Not Auxiliary Heater)

You might find this thread very interesting ... it's a way to make your Booster into an Aux with "just a DPDT switch"

Scroll around (and perhaps visit the first page, too, but the schematic is at post #47

https://sprinter-source.com/forum/sh...t=36797&page=2

--dick
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Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))
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Old 11-13-2018, 03:52 AM   #37
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Default Re: Heater Booster (Not Auxiliary Heater)

Here’s a flow-chart of the Espar operation (from the “comprehensive” manual linked above).
(the water pump on the firewall is powered by the van so should run full time while REST or Boost is on - that’s normal for the Sprinter’s boost heater) Good luck with the fan inspection/lube!

-dave

ps: the Espar's K-line (module HBM in DC speak) is wired to Pin-15 of the van's OBDII port ("data link connector") and it's possible that an Elm327 chip could communicate with it there and read its fault codes if anyone knows its physical address?
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Old 11-13-2018, 12:22 PM   #38
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Default Re: Heater Booster (Not Auxiliary Heater)

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Originally Posted by Nautamaran View Post
Here’s a flow-chart of the Espar operation (from the “comprehensive” manual linked above).
(the water pump on the firewall is powered by the van so should run full time while REST or Boost is on - that’s normal for the Sprinter’s boost heater) Good luck with the fan inspection/lube!

-dave
That is a good flow chart, quite helpful, and matches my observation of start up sequence.
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Old 11-13-2018, 03:21 PM   #39
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Default Re: Heater Booster (Not Auxiliary Heater)

Quote:
Originally Posted by autostaretx View Post
There is a difference between "does nothing" and "LED comes on, but espar doesn't". When you turn ON the bow tie/LED, can you hear a faint "tick tick" from (more or less) under the driver's seat (it's really under the Sprinter) ... that would be the fuel pump for the heater being triggered. --dick
This thread and the 30 degree temperatures that have finally arrived in LA have prompted me to try my Heater Booster function. From reading this and reviewing the manual, my understanding is that I only have heater booster function (bowtie button, only functional when engine is running), and NOT Auxiliary/pre-heater function (center console button, can be operated with engine not running). My LED light comes on when I push the bowtie button, but nothing after that: no tick tick under seat, although I don't see how you can hear that over the clackity clack of a cold diesel engine idling; no fan noise from the ESPAR; no exhaust from the ESPAR; So where's the diagnostic starting point from here? Codes? Fuse? I have iCarsoft MBII. Is HZR heater control what talks to the ESPAR?

Thanks.
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Old 11-13-2018, 03:52 PM   #40
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Default Re: Heater Booster (Not Auxiliary Heater)

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Originally Posted by doug022984 View Post
... LED light comes on when I push the bowtie button, but nothing after that: no tick tick under seat, although I don't see how you can hear that over the clackity clack of a cold diesel engine idling; no fan noise from the ESPAR; no exhaust from the ESPAR; So where's the diagnostic starting point from here?
am going thru same sitch myself - does your REST function work?
press the REST button and see if the pump and HVAC fan runs
this will confirm basic ops of the pump control...

assuming this works?

the next thing to try is a 'reset' of the control function of the espar:
cold start is best, since the heat boost function is dependent on engine/coolant temp.
(nears i know, this thing, config'd for booster only/no aux - only runs when coolant temp is low)
start engine, turn on booster (the middle button on the control, LED should light)
then pull the 2 fuses on fuseblock2 (under driver seat) the 25amp + the 10amp marked 'booster'
on mine they are #4 (25a) and #9 (10a) - then plug em back in and wait... (assumes fuses are not burnt)

there's other tricks that can be tried, but from what others have noted here, the reset seems to
be the place to start, since if the DC coolant pump is no good, or the combustion fan is stuck,
the espar might've locked out.

there's a number of currently active threads on this issue - the above is my 'consensus' of
the forum brain trust's suggestions on getting the espar to light up.

the next/biggest question is:
if shes broke, is it worth the effort to fix a 12+year old unit (which in my case, having no idea
when the last time the thing ran) vs replacing the entire unit.

and with what model?? - have been researching this the past few daze and still havent come up
with a suitable replacement (the D5WZ / mod# 25 2343 apparently are no longer available)

so the next question becomes: can what is available be used to replace the 25 2343's
with modification/reconfig of the vans wiring? (theres a number of schemes mentioned here)

what i'm really wanting to do is completely disconnect the espar from the vans control systems
and power it from the house/aux battery - that would remove a number of problems associated
with letting the engine ECU control things - vs a simple on/off button, or use of the 7day timer
on vans like mine, that didnt come with it (and arent wired for it???)

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