O2 Sensor, Environmental Blower Issue, Shop Manual

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royrapoport

Howdy folks,

I'm posting this question on behalf of my dad who is still very much
afraid of his computer. He's got a 1998 S70GLT. I've attempted to
Google for any obvious answers to these questions or for an S70 FAQ but
couldn't find anything obviously relevant. Three questions:

1. My dad's fond of doing his own repairs, but has found the Chilton
shop manuals not specific and helpful enough. Are there any other
recommendations for reasonably-priced shop manuals?

2. Recently, a mechanic inspected some of the output from the on-board
systems and suggested his fuel's running a little rich and he might
need to replace his O2 sensor. Apparently, however, there are actually
two of them. The car has about 147K miles on it. Should he replace
both O2 sensors as a matter of preventive maintenace or just one? If
just one, which?

And the fun one:
3. Occasionally, when he starts the car up, the environmental system
starts working for less than a second, then completely stops and both
the 'recirculate' button light (which is orange) and the 'off' button
light (which is also orange) start blinking. This *NEVER* happens in
the morning when he first starts the car, and it *NEVER* happens
mid-drive -- only when he starts the car up (or just turns the key to
the 'on' position). Turning the car off and on again, several times,
often clears this, but sometimes not. Any ideas?

Thanks for any suggestions anyone may be able to come up with,
-roy
 
Howdy folks,

I'm posting this question on behalf of my dad who is still very much
afraid of his computer. He's got a 1998 S70GLT. I've attempted to
Google for any obvious answers to these questions or for an S70 FAQ but
couldn't find anything obviously relevant. Three questions:

1. My dad's fond of doing his own repairs, but has found the Chilton
shop manuals not specific and helpful enough. Are there any other
recommendations for reasonably-priced shop manuals?
Click to expand...
From 1996 onward, the only manual supplied by Volvo is the electrical
diagrams. Everything else is available on the web, via subscription,
or some extremely expensive DVD's. http://www.volvotechinfo.com
2. Recently, a mechanic inspected some of the output from the on-board
systems and suggested his fuel's running a little rich and he might
need to replace his O2 sensor. Apparently, however, there are actually
two of them. The car has about 147K miles on it. Should he replace
both O2 sensors as a matter of preventive maintenace or just one? If
just one, which?
Click to expand...

The OBD fault codes were readable vian an underhood panel and
documented in the service manuals on 94 and 95 models. WIth later
models, the only way to find out what sensor turned on the light is
via a $50.00 trip to the dealer, or possible a generic scantool,
assuming the "public" codes can differentiate a front from a rear
sensor.
And the fun one:
3. Occasionally, when he starts the car up, the environmental system
starts working for less than a second, then completely stops and both
the 'recirculate' button light (which is orange) and the 'off' button
light (which is also orange) start blinking. This *NEVER* happens in
the morning when he first starts the car, and it *NEVER* happens
mid-drive -- only when he starts the car up (or just turns the key to
the 'on' position). Turning the car off and on again, several times,
often clears this, but sometimes not. Any ideas?
Click to expand...

Another $50.00 trip to the dealer. The codes for
non-emissions-releaed faults are not available to owners any more,
although you can find some of them online:
http://www.volvospeed.com/maintence.htm
I occasionally get the climagte control blinks on my 94, and the code
is for one of the cabin temp sensors. The ones near the driver's and
passenger's heads have tiny fans to draw the air through them. If
these fans are clogged and sticking, this will generate a code.

Trade it in for a 95. I like to work on my cars too, but Volvo has
made it impossible for owners to maintain their new models, so I won't
be buying another one.

To reply, please remove one letter from each side of "@"
Spammers are VERMIN. Please kill them all.
 
Howdy folks,

I'm posting this question on behalf of my dad who is still very much
afraid of his computer. He's got a 1998 S70GLT. I've attempted to
Google for any obvious answers to these questions or for an S70 FAQ but
couldn't find anything obviously relevant. Three questions:

1. My dad's fond of doing his own repairs, but has found the Chilton
shop manuals not specific and helpful enough. Are there any other
recommendations for reasonably-priced shop manuals?

2. Recently, a mechanic inspected some of the output from the on-board
systems and suggested his fuel's running a little rich and he might
need to replace his O2 sensor. Apparently, however, there are actually
two of them. The car has about 147K miles on it. Should he replace
both O2 sensors as a matter of preventive maintenace or just one? If
just one, which?
Click to expand...

I wouldn't do anything without more detail than this. Was the check
engine light on? If not, I wouldn't do anything. If so, what you do
depends on which code(s) is/are stored.
Generally the front sensor is the one that goes bad first, and is the
one that has the most effect on the mixture. The rear one is just there
to check both the front sensor and the catalytic convertor.
And the fun one:
3. Occasionally, when he starts the car up, the environmental system
starts working for less than a second, then completely stops and both
the 'recirculate' button light (which is orange) and the 'off' button
light (which is also orange) start blinking. This *NEVER* happens in
the morning when he first starts the car, and it *NEVER* happens
mid-drive -- only when he starts the car up (or just turns the key to
the 'on' position). Turning the car off and on again, several times,
often clears this, but sometimes not. Any ideas?

Thanks for any suggestions anyone may be able to come up with,
-roy
Click to expand...

This will have set a code for the climate control, which will only be
readable with code readers with Volvo specific applications. However,
since the fan is shutting down, a good guess is the fan motor. As the
bearings seize up, the motor starts to draw more current for a given
applied voltage. The climate computer monitors this, and turns the fan
off to protect the speed control circuit. Once again it would be better
to have the code read to make sure, rather than guessing.

--
Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
 
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