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Heater control circuit is your O2/oxygen sensor which controls your emissions and keeps the car running efficiently. They go out quite frequently and need to be replaced. Wont cause any drivability issues other then lower fuel economy and check engine light. Sensors run between $50-$200 each.
before I do a job like this i always buy a haynes repair manual for my year and car. take the time to read up on this and then well knowledged i go for it.
Good luck and thanks for your question and I hope my suggestions help. Don't forget to rate me. burdfrenzy
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 1998 Volvo S70 AUTOMOBILES
Includes starter and alternator replacement procedures for domestic and imported 1998 Volvo S70 cars and light trucks from 1990+.
Alternator, Replace -> With Air Conditioning -> Without Air Conditioning Vehicle: 1998 Volvo S70 2.3 L5 GAS
With Air Conditioning
Disconnect battery ground cable at battery.
Detach pipe from control module box.
Remove auxiliaries belt.
Remove power steering pump and place it on top of engine.
Remove upper bolt.
Remove bolts common to alternator and compressor; lower bolts on alternator and upper bolts on compressor.
Raise and support vehicle.
Loosen lower bolts for compressor (so that there is some clearance).
Remove air baffle.
Lower vehicle.
Disconnect warning lamp positive lead and connector from alternator.
turn off radio.remove negative batterry cable remove drive belt power steering pump.set a side do not disconnect.then remove alternator and its electrical connectors then remove alternator.
1. Disconnect the battery
2 Loosen botls so you can remove the drive belt to alternator.
3. If it has a serpertine belt, then pry with proper tool on the tensioner to remove the belt.
4. Disconnect harness to alternator and ground wire if any and filter condenser if any.
5. Loosen bolts to alternator and remove alternator.
6. If AC equipped, not knowing your belt configuration would require to loosen the AC Belt also, depending if your alternator belts is the first one near the engine, then all belts have to be loosen to remove it. unless #3 applies.
Reverse the steps to put it back on.
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