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S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004. |
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s40 heater not workingViews : 2160 Replies : 3Users Viewing This Thread : |
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Dec 18th, 2010, 08:52 | #1 |
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Last Online: Jan 16th, 2011 11:36
Join Date: Dec 2010
Location: st leonards on sea east sussex
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s40 heater not working
hi i,m new at this so be kind: s40 auto (w) plate, heater not working, main fuse ok, power to all other fuses ect inside/under bonnet. is there a in line fuse some where???????????/
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Dec 18th, 2010, 09:58 | #2 |
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Last Online: Today 08:33
Join Date: Jul 2010
Location: Kent, UK
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no airflow or no heat ?
Hi M I,
Firstly welcome to the forum.. When you say the heater isnt working, do you mean the fan/blower isnt blowing air out of the vents, or do you have air blowing out but no heat in it? If its the blower not working, i recall theres a regulator i think some refer to it as a 'transistor', but its basically a device on a heatsink (aluminium finned thing) thats in the passenger footwell (above it i seem to remember) i had mine fail on my old S40 resulting in slow or no fan speed, not sure if this applies to all aircon systems, (mine had the full A/C option) but i would think so if yours has a fan speed control knob. Ill dig out some more details, if this sounds like your problem. |
Dec 19th, 2010, 18:14 | #3 |
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Last Online: Jan 16th, 2011 11:36
Join Date: Dec 2010
Location: st leonards on sea east sussex
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heater not working
no blower working at all
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Dec 19th, 2010, 22:24 | #4 |
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Last Online: Today 08:33
Join Date: Jul 2010
Location: Kent, UK
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Check the transisitor module
Sounds like the module i mentioned,, the blower has a +12v (fused) feed to one side and then then 'transistor' is used on the return side to chassis to control the speed of the blower, if you remove the passenger well plastic cover (above passengers feet area) then i think the module is there on the left side, connects via a 4pin connector, if you want to test out if its the blower thats faulty or the transistor you can (if you get the correct connection) link the blower return side to chassis, which should result in the fan working at full speed. If the blower doesnt run or it pops a fuse then its probably the blower thats faulty, but i think the transistor is usually the culprit.(might also be a quick temporary fix if you use a switch in this side) the module P/N i think is 30864189. Ive got some notes i could email if you want to pm me your email add, hope thats helpful.
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