Question about 1985 Volvo 740

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Volvo 740GL 1985. The dash switch for the rear windscreen demister is stuck in the ON position will not turn off power to the demister. Is this a problem of the timer, or the control relay switch. Where can I locate these to check?

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  • Contributor
  • 7 Answers

Hi this could just be a faulty switch,especially if it's the origional one.

Posted on Jan 13, 2013

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keemo68
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SOURCE: 1985 Volvo 240 no fuel no spark

well first the fuel pump relay is bad, that is easily replaced. next you have no spark. the first thing you do is take the cap off the distributerand crank the engine. if it spins that tell syou thyat at least the tang or gear on the shaft of the distributor is ok and not broken. next thing is remove the #1 plug and use a 1/4 drive extension 6" long and turn the crank by hand until the #1 cylinder is top dead center(put the extension in the hole of head where the plug was and you should feel the top of the piston also make sure you can feel the top of the piston with half the extension this way you don't drop it in the cylinder with the piston at TDC(top dead center) the rotor of the distributor should be pointed at the #1 firing position. IF it does not that means your timing is off and you need to retime it by taking off timing cover and either replacing the belt/chain or gears. now if you do not have a distributor and you have a coil pack there could be only 2 things that won't give spark. either a bad coil or your altenater is bad(the battery is responsible for starting not running the vehicle like alot of people assume. the altenator energizes the coil which inturngives spark. hope this helps you please rate this thanks

Posted on Sep 07, 2008

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SOURCE: 1999 volvo s80 passenger seat stuck in forward position

you will need to check to make sure no coins fell into the track and is jammed it if not you will need to replace the bottom frame of the seat possible with a junk yard one much cheaper than buying new and junkyard frames come complete.

Posted on Jan 08, 2009

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SOURCE: 85 volvo dl fuel evaporative control functional (failed) @ smog check

replace the pvc valve and have the egr valve replace.make sure the vacuum hoses connect to egr valve and pvc replace.change air filter.all those things will cause high emission if not working properly.cause you to fail smog test.

Posted on May 31, 2009

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SOURCE: how do i find TDC when set the timing marks on 1990 volvo 740gl

if you know the firing order of the engine and also the position of the no.1 cylinder you are off to a good start.
Remove the plug on the no.1 cylinder and turn the engine until the piston starts coming up on compression stroke, you can fing out if it is on compression stroke by placing your finger or thumb over the spark plug hole, you will feel the pressure under your thumb or finger as the piston starts to come up the bore.
when you can feel that pressure you can remove your thumb etc and stick a medium size screwdriver into the hole making sure you hold it from falling into the cylinder, rest the end of the driver on top of the piston and turn the engine slowly by hand only, (not by the starter) until the piston has come up to the top of the cylinder, now have a look at the harmonic balancer on the end of the crankshaft, there should be markings on it and one marking will have a "0" with TDC above it, line that mark up with the pointer and that will be top dead center

Posted on Jun 26, 2010

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SOURCE: 96 Volvo 850 Turbo. Both headlights went out but

Hi, the problem you are having is with the switch itself, this is a common problem so the switch is not expensive to buy.

once you replace the switch the lights will work as normal.

if it was just one light not working then you could say bulb if the high beam wasnt working then you could say it was fuse or relay but as you have high beam this would rule out them being the fault.

now the only other problem it could be is a wire so give the wires a bit of a wiggle at the back of the head lights then give them a try if they then work you may need to do some soldering to fix a loose wire but if they still dont work then this would suggest the switch itself is at fault.

let me know how you get on or if you need further assistance ok

Posted on Sep 16, 2010

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