1998 Volvo s70 stuff

In an earlier contribution to this discussion,

The brake discs need to be replaced if they are worn to below the minimum
permissible thickness, are badly scored, or run out by more than the
permitted amount. Otherwise keep them. I certainly wouldn't replace
perfectly good discs just because they have done a certain mileage.

Don't know about the second question.

 

How important is it to replace the rotors on a 98 s70 after 60-70k? (I've
been told it's imperative).

I can appreciate perfection but if it can wait, so be it.

The braking is smooth...there is some wear in the rotors but as long as they
do the job, I don't care what they look like.

Also, typically how often should a midwest car (my S70)
need more AC refrigerant? If I'm getting a certain temperature out of the
vents....I'm ok?

What temperature should it typically read?

Thanks for any help.

 

Unless there is a manufacturing problem with the disks they only need
to be replaced when they are worn below minimum spec. 60k sounds
awful low to me unless they were warped badly enough that they
couldn't be turned.

Refrigerant doesn't wear out like motor oil. All auto systems leak a
little, but those leaks are so small now that it is very likely you
will sell the car before the a/c system needs refrigerant. If it is
cool inside and your happy don't worry about it. The system has
protection to stop the compressor should the pressure get so low that
damage was eminent.

Toooooo many variables! Outside temp, heat load, humidity, engine
rpm, vehicle speed etc... If it is cooling the car ok don't worry
about it.

Steve B.

 

I believe that the minimum thickness for the rotors is 23mm and the pads is
definitely 3mm. At those thicknesses, you need to replace the pads and
rotors. And, the rotors cannot be turned any longer.

I'll let others tackle the A/C problem. I've always let the experts tell
me I need a recharge, only if I am not getting the cooling power out of the
A/C that I want. You can also increase the efficiency with an ELECTRIC
cooling fan mounted on the A/C condensor so as it either PULLS air or
PUSHES air thru the condensor thus dispursing the heat from the condensor.

 

Theoretically never, the AC is for all practical purposes a sealed system,
if it works leave it alone.

 

How important is it to replace the rotors on a 98 s70 after 60-70k? (I've

My 98' S70 currently has 110,000 miles on the clock. So far it is still on
the origonal rotors and I have only ever had to change the pads once (at
60,000 for the front and 70,000 at the rear). This is a car that has been
services by the same main dealer all it's life so if they needed doing, I am
pretty sure my dealer would have told me.

As my car is getting older, I have found that every 2 years seems to be
about right.

 

With experience of 2 850s and an '98 S70 I've found anywhere between 50 and
70k is about the usual life for front brake rotors (discs) I would only
replace them when they are either so thin they've warped, are badly grooved,
or the lip is so large you cant get the caliper over it to change the pads.
I would suggest about 70k would be a reasonable mileage for mixed
use,however if you just run on the freeway and only lightly use the brakes
you'll do a greater distance. In this case its the rear pads and discs which
will need replacement sooner as they tend to corrode badly when under used.

Our S70 is alittle short on gas at the moment- the symptoms of this is
regular cycling of the compressor clutch caused by the low pressure switch
cutting it out when the ambient air is warmer and the system is calling for
cold. The rad fan will only run occasionally. With the ambient temperature
lower you will find it functions normally and the compressor will run
whenever the system needs it.

Most manual A/C systems should reach 4 degree's at the central vents with
recirc on, an interior temp of about 18deg and the fan on speed 2 with the
engine at a fast tickover (1500rpm)

Tim..

 

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