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Should new black expansion cap hiss when engine is hot like old black cap did? 700 1990

posted by  blackdogjenny on  Sat Oct 11 11:32 CST 2003
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Original Volvo black expansion 75kPa was 14 years old so thought I'd replace it with a new generic black IPD cap with same 75kPa except it does not say Volvo on it and cost $7.95. Original cap would hiss releasing pressure with hot engine but new cap stays tight--no pressure releasing hiss and we just got back from climbing a mountain (barely) with the heavy brick. What is your opinion, do you think the old cap was maybe tired out and releasing pressure at a lesser rating than 75kPa but the new cap is working as it should? Sorry for such a trivial question.
--
1990 740GL Wagon 218,000 Miles AW70L B230F 8 Valve Non-Turbo Regina






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