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Repair Database Category: Belts, Hoses & Lines

Info and tutorials on Volvo belts, hoses and vacuum lines… the various engine accessories that keep our engines running

June 14, 2014

Turbo S80 TCV & Vacuum Line Routing

The pressure from the outlet of the turbo presses on the wastegate diaphragm to keep it closed. When the ECU decides there is enough boost, it stops allowing the air from the turbo outlet from going to the wastegate actuator and allows it to go to the compressor inlet tube. The system is a pulse width modulated system meaning it is never “always on”, but instead cycled on for longer periods of time to increase boost, and shorter to decrease boost. When the TCV is off, air from the compressor is dumped to the compressor inlet, and the spring pressure in the wastegate is what regulates compressor outlet pressure.

Turbo S80 TCV & Vacuum Line Routing
June 13, 2014

DIY $2 Serpentine Belt Tool & Routing

MVS Forums member QuirkySwede offers up a challenger to the hotly-contested World’s Cheapest Serpentine Belt Tool Trophy™ (see my own 75¢ job). Plus he sheds some light on serpentine belt routing theory and practice. Notice how Volvo first changed routing to improve grip on the alternator, and later (bottom right) routing regained grip on the […]

DIY $2 Serpentine Belt Tool & Routing
April 25, 2014

V70 P0455, P0440, P0442 Fix w/ Photos

Finally got fed up with the host of evap codes on my 1998 V70 AWD and went ahead and replaced the canister hoses, rollover valve hoses, purge valve (and surrounding hoses), and the three inches of rubber line connecting the small vent filler tube to the hard plastic line coming from top of fuel tank. I didn’t order any special hoses, rather went to Autozone and bought a variety of molded J and U hoses (they were kind enough to let me go the back and pick out what I needed).

V70 P0455, P0440, P0442 Fix w/ Photos
November 25, 2013

Fix S70 Fuel Vent Hose w/o Dropping Gas Tank

“I have a fuel leak, which leaks from the top of the gas tank. I think it is from the Vent Hose. If you do it this way (drilling a small 3/8-inch hole), there is no need to drop the gas tank!”

Fix S70 Fuel Vent Hose w/o Dropping Gas Tank
September 16, 2013

99 V70XC w/AC Serpentine Belt Pattern – Photo

99 v70xc w/AC Serpentine Belt Pattern (Nice Clean Photo)

99 V70XC w/AC Serpentine Belt Pattern – Photo