I just bought a 2000 v 70 xc awd wagon. Are there any things I should be on the look out for?
One thing I noticed is that when cruising on the highway about 65 mph, if you ease the gas pedal down an inch or so so that it shifts downout of overdrive there is a "bump" almost like hitting an expansion strip, is this normal. Do these Volvo transmission shift so firmly?
Thanks, Norman
That is transmission lockup to prevent slippage and increase gas mileage. Most modern transmissions do this, but it is not that noticeable most of the time.
To my knowledge is this not the best AWD system, from 2003 it is oke.
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The 2000 uses viscous coupling which is what Subaru and many other companies have used for many years. It is a very good system.
The Haldex AWD system was introduced on the V70 and XC70 in 2003. Previously, both all-wheel-drive V70s used a viscous coupling to direct driving torque where it could do the most good. But that setup has been replaced by an all-electronic system from Haldex, the same system Volvo uses on the S60 AWD and XC90. According to Volvo, the Haldex system reacts extremely quickly to wheel slip, routing power to the wheels with greater traction almost instantaneously: just one-seventh of a wheel rotation to be exact. Both systems are fully automatic; no input from the driver is ever required.
Stephen, there was much trouble with the "old" AWD system, when pushed hard the system became to hot and broke down, which was very expensive.
"Stephen Henn>
That was a Volvo problem and had nothing to do with Viscous coupling. Viscous coupling is an old tried and true technology that was not implemented adequately. There is nothing to guarantee that the Haldex system will become unreliable in the future. It is computer based and its integrity depends upon the computer and its sensors. We all have experienced computer or sensor problems. They are expensive to repair. I know, I have replaced input speed sensors, throttle position sensors, and output speed sensors on an 850.
I have a 2001 Volvo XC70 with the old viscous coupling system that has served me very well. Viscous coupling is very sensitive to tire diameter mismatches. The tires need to be frequently rotated. If used properly it will serve very well.
On an Subaru I had with viscous coupling, it would actually pulsate the power if the tire mismatch from front to rear was too great. It wanted the best (largest) tires in front. If the front tires wore too much, it thought that they were slipping and would transfer power to the rear tires. At an intermediate stage it would pulsate. The solution was to rotate the tires. It did no damage to the AWD system, just was annoying.
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