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Next: FA 200+ Issues Panorama
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External
Since: Jul 17, 2004
Posts: 24
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(Msg. 1) Posted: Thu Dec 16, 2004 1:40 pm
Post subject: 740 Heater blocked
Archived from groups: alt>autos>volvo (more info?)
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| I have a 740 with what appears to be a blocked heater matrix.
What is the best way to clear the block, it was caused when an additive was
added to cure a leak in the rad but it appears to have also blocked the
heater.
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>> Stay informed about: 740 Heater blocked |
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External
Since: Oct 30, 2004
Posts: 1722
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(Msg. 2) Posted: Thu Dec 16, 2004 1:40 pm
Post subject: Re: 740 Heater blocked [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"noreply@invalid" <noreply.DeleteThis@ntlworld.invalid> wrote in message
news:BRjwd.598$Rl4.51@newsfe5-win.ntli.net...
>I have a 740 with what appears to be a blocked heater matrix.
> What is the best way to clear the block, it was caused when an additive
> was
> added to cure a leak in the rad but it appears to have also blocked the
> heater.
>
>
>
As James Sweet says, the best way is to remove and replace the heater
matrix. Sadly, that is a huge job.
You may have luck with disconecting the heater hoses (both of them) and duct
taping a garden hose to the outlet pipe (the upper one, I think) of the
heater matrix. Open the tap a bit and try to flush the heater backward that
way. If dirty water starts coming out you can increase the flow - ultimately
you should be able to get water through it like you'd get out of a kitchen
tap. If it resists, try it on the other pipe - and keep pushing back and
forth until you give up or you get a good flow of clear water.
If the heater still doesn't work, don't forget there is a heater control
valve near the matrix in the lower hose. Those valves get grungy and jam.
Mike<!-- ~MESSAGE_AFTER~ --> |
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External
Since: Feb 03, 2004
Posts: 1364
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(Msg. 3) Posted: Thu Dec 16, 2004 2:40 pm
Post subject: Re: 740 Heater blocked [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"noreply@invalid" <noreply.TakeThisOut@ntlworld.invalid> wrote in message
news:BRjwd.598$Rl4.51@newsfe5-win.ntli.net...
> I have a 740 with what appears to be a blocked heater matrix.
> What is the best way to clear the block, it was caused when an additive
was
> added to cure a leak in the rad but it appears to have also blocked the
> heater.
>
>
>
Best (and possibly only) way to clear it if it's indeed blocked is to
replace it. It also could have jammed up the heater control valve. Stop-leak
additives usually cause more harm than good, they can mess up the whole
cooling system, better to fix the leak correctly.<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: 740 Heater blocked |
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External
Since: Jul 17, 2004
Posts: 24
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(Msg. 4) Posted: Sat Dec 18, 2004 12:40 pm
Post subject: Re: 740 Heater blocked [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Thanks, the hosepipe did the trick
Michael Pardee <michaeltnull RemoveThis @cybertrails.com> wrote in message
news:PeWdndnwmtwVf1zcRVn-gQ@sedona.net...
> "noreply@invalid" <noreply RemoveThis @ntlworld.invalid> wrote in message
> news:BRjwd.598$Rl4.51@newsfe5-win.ntli.net...
> >I have a 740 with what appears to be a blocked heater matrix.
> > What is the best way to clear the block, it was caused when an additive
> > was
> > added to cure a leak in the rad but it appears to have also blocked the
> > heater.
> >
> >
> >
> As James Sweet says, the best way is to remove and replace the heater
> matrix. Sadly, that is a huge job.
>
> You may have luck with disconecting the heater hoses (both of them) and
duct
> taping a garden hose to the outlet pipe (the upper one, I think) of the
> heater matrix. Open the tap a bit and try to flush the heater backward
that
> way. If dirty water starts coming out you can increase the flow -
ultimately
> you should be able to get water through it like you'd get out of a kitchen
> tap. If it resists, try it on the other pipe - and keep pushing back and
> forth until you give up or you get a good flow of clear water.
>
> If the heater still doesn't work, don't forget there is a heater control
> valve near the matrix in the lower hose. Those valves get grungy and jam.
>
> Mike
>
><!-- ~MESSAGE_AFTER~ --> >> Stay informed about: 740 Heater blocked |
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External
Since: Nov 07, 2004
Posts: 4
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(Msg. 5) Posted: Sat Dec 18, 2004 6:40 pm
Post subject: Re: 740 Heater blocked [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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You were lucky! I had to replace the entire unit. WHAT a job! The
steering wheel and pedals were left. But I managed to fix dodgy wiring, get
all dash lights to work, and a few squeaks as well. But never again I hope!
Paul
"noreply@invalid" <noreply.RemoveThis@ntlworld.invalid> wrote in message
news:PcZwd.425$tU2.289@newsfe3-win.ntli.net...
> Thanks, the hosepipe did the trick
> Michael Pardee <michaeltnull.RemoveThis@cybertrails.com> wrote in message
> news:PeWdndnwmtwVf1zcRVn-gQ@sedona.net...
>> "noreply@invalid" <noreply.RemoveThis@ntlworld.invalid> wrote in message
>> news:BRjwd.598$Rl4.51@newsfe5-win.ntli.net...
>> >I have a 740 with what appears to be a blocked heater matrix.
>> > What is the best way to clear the block, it was caused when an additive
>> > was
>> > added to cure a leak in the rad but it appears to have also blocked the
>> > heater.
>> >
>> >
>> >
>> As James Sweet says, the best way is to remove and replace the heater
>> matrix. Sadly, that is a huge job.
>>
>> You may have luck with disconecting the heater hoses (both of them) and
> duct
>> taping a garden hose to the outlet pipe (the upper one, I think) of the
>> heater matrix. Open the tap a bit and try to flush the heater backward
> that
>> way. If dirty water starts coming out you can increase the flow -
> ultimately
>> you should be able to get water through it like you'd get out of a
>> kitchen
>> tap. If it resists, try it on the other pipe - and keep pushing back and
>> forth until you give up or you get a good flow of clear water.
>>
>> If the heater still doesn't work, don't forget there is a heater control
>> valve near the matrix in the lower hose. Those valves get grungy and jam.
>>
>> Mike
>>
>>
>
><!-- ~MESSAGE_AFTER~ --> >> Stay informed about: 740 Heater blocked |
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External
Since: Oct 08, 2004
Posts: 217
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(Msg. 6) Posted: Tue Dec 21, 2004 7:40 pm
Post subject: Re: 740 Heater blocked [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Reverse flush using a hose or low setting on a pressure washer with pulse
jet nozzle. You may need to remove the matrix to make sure you don't need to
swim in your seat.
Cheers, Peter.
"noreply@invalid" <noreply RemoveThis @ntlworld.invalid> wrote in message
news:BRjwd.598$Rl4.51@newsfe5-win.ntli.net...
>I have a 740 with what appears to be a blocked heater matrix.
> What is the best way to clear the block, it was caused when an additive
> was
> added to cure a leak in the rad but it appears to have also blocked the
> heater.
>
>
><!-- ~MESSAGE_AFTER~ --> >> Stay informed about: 740 Heater blocked |
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