Question about 1998 Volvo S90

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S90 won't start if not driven daily and AC doesn't work uphill

Late 90's Volvo S90 model with 174k miles. 6mths ago, when i'd start the engine the dashboard and headlights would light up, but the engine would just rev and rev and not turn over. I'd turn it off then rev it again and finally it turned over. Progressed 2 mths later to not turning over at all if I didn't drive it daily; then required a jump start and would be fine for the day. Additionally, AC no longer works if I accelerate while moving uphill or if I run it for a long time on a VERY hot day. Otherwise, AC is fine. Alternated tested at 13.4v, had it replaced. Has not fixed either problem. Radiator replaced, fan and timing belt replaced recently. Battery < 6mths old and fine. Any ideas? Trusted mech looked worriedly at me and spoke of "computer problems" w/ fear in his eyes...

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First check the wire harness connecting to the spark plugs ignition coils f/b connections to the fuel injectors and then to the ignition circuit unit and lastly to the gearbox. Check yr all the groundings in the engine bay. If necessary install new grounding wires. As for the air conditioner, check the 2 smal valves in the hood at the firewall, if ok, then it may be one or two of the 4 bellows under the dash has given way. Also check the temperature sensor at the dash (top) front passenger side and the sensor pressure valve (connected to the evaporator piping) underneath the carriage at the front.

Posted on Aug 03, 2009

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Posted on Jan 02, 2017

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