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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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Heater and high revsViews : 414 Replies : 2Users Viewing This Thread : |
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Mar 10th, 2020, 19:27 | #1 |
and Craig!
Last Online: Apr 1st, 2024 06:25
Join Date: Jun 2007
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Heater and high revs
Hi all,
When i slide the slider button to turn my heater on, the revs jump up from tickover to around 1300rpm, this in turn is giving me rev hang on gear change, also once in a blue moon the heater will just cut out but restart if i turn the ignition off then on again, with the heater off tickover is fine and know rev hang, The car has a good battery and air con multi plug is disconnected, Any advice much appreaciated. Craig.
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Michelle and Craig. 855 R 855 T-5 |
Mar 11th, 2020, 08:54 | #2 |
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It sounds as though the power transistor on the blower motor has failed, replacing is quite straight forward but it might be more economic in the long run to consider changing the blower motor for a low mileage or known good working one from a breaker.
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The saddest moment is when the one who gave you the best memories....becomes a MEMORY V70 SE 2004 2.3L T5 Geartronic, C70 2005 2.0T Automatic, Sold 2.4l 20 Valve Automatic Torslander Sold 854 GLT 20v Auto |
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Mar 12th, 2020, 21:35 | #3 |
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Also consider servicing the idle air control valve (sounds as though it's sticking when compensating the engine load), throttle butterfly valve and housing.
The electric side of the gnition switch is another possible candidate so make sure it's returning to position II after starting the engine. Replacement is recommended if no knowledge of it being replaced
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Liam... '96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav. |
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