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Fan relay lifespan

Discussion in 'VR - VS Holden Commodore (1993 - 1997)' started by losh1971, Jun 17, 2019.

  1. losh1971

    losh1971 Well-Known Member

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    Just checking are thermo fan relays something that wears out quicker than all the other exactly same ones under the bonnet? My fans stopped again tonight and it nearly boiled. Happened before but last time it wasn't 10deg but it did boil over after stopping at some lights.
    Tonight it went up to the second last bar before red but came down to about half by the time I hit the highway. Got home and no fans even with A/C on. Swapped over a relay from A/C and bam the fans worked.
    I have no probs going to Holden and buying a new relay for 20 bucks, more curious as to understand if these tend not to last as long, since they probably get the most work out and highest load? Or whether I need to look at getting a SH fan from the wreckers? I guess my thinking is if it was a fan issue then surely a fuse would blow?
     
  2. EYY

    EYY Well-Known Member

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    Usually the relay is the cause in that case. But did you try the fan relay in the headlight socket? Could be a bad connection in the fan relay socket.

    Not common to have to replace relays at all really.
     
  3. losh1971

    losh1971 Well-Known Member

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    I swapped it over with the A/C and the fans fired back up. Although I am pretty sure the A/C was working with the faulty relay. It was dark and i just needed to make sure i was right to head to work in the morning. I was wondering if the pins or female parts may be corroded or blackend. Too hard to see in the dark. I will remove the relay pour some Alibrite on them tomorrow and have a look at the posts on the relay as well.
     
  4. EYY

    EYY Well-Known Member

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    Just use wd40 or contact cleaner(preferably)
     
  5. losh1971

    losh1971 Well-Known Member

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    I have WD, I have used contact cleaner from Repco and it was useless. The good gear is at Jaycar just don't get there too often anymore. Is alibrite too harsh for for electrical contacts?
     
  6. EYY

    EYY Well-Known Member

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    That stuff’s corrosive from memory. If it’s what I think it is, it’s probably one of the worst things you could put on electrical connections lol
     
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  7. losh1971

    losh1971 Well-Known Member

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    Yeah its a alloy restorer so acid based. I will wet n dry the relay posts and put some RP7 on the females. Then push and pull the relay a few times to clean up the contact surface. Chances are they are just tarnished from being so old. I might grab a new relay from Holden though for the engine fan, since its not one i want to fail.
     
    Last edited: Jun 18, 2019
  8. losh1971

    losh1971 Well-Known Member

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    Just had a look at the relay holder and it has been arcing on the main power post. Looks like a tip to the wreckers to see if they will part with a holder. I just need to find a damaged relay panel that has already been chopped into, as I will need to cut wires since I'm having trouble getting the terminal out of the holder. I will probably need an auto electrician to crimp on a new terminal. I have cleaned up the lugs with some brake cleaner and some RP7 and tried to tighten up the lug with a small screw driver.

    Am I right in thinking a VS should be the same as VR? I know they are similar all the way through to VX, just not sure if they are all the same wire colours etc.
     
  9. vs-lover

    vs-lover Well-Known Member

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    I could've sent you that for nix with the two radiator bards as these parts are plentiful here in Adelaide.
     
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  10. losh1971

    losh1971 Well-Known Member

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    I should be able to get one cheap. I just have to poke around 15 wrecks to find one that the wiring harness have been raped and pillaged.
     
  11. gtrboyy

    gtrboyy Well-Known Member

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    Out of all cars i've owned only had one faulty relay replaced under warranty/factory recall on a vt ss when it was 12 months old...did the opposite when fans came on they stayed on even after car turned off lol
     
  12. vs-lover

    vs-lover Well-Known Member

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    Relays are pretty robust things and basically all these cars go to scrap with them still installed and never removed.
     
  13. losh1971

    losh1971 Well-Known Member

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    I think the issue for mine is the holder as it has a melted spot on the main power position. Which is affecting the way it tightens on the relay post.
     
  14. vs-lover

    vs-lover Well-Known Member

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    ahhh ! the ol' VL fuse rail issue around the headlight fuse where they all melt due to high current being drawn through the fuse and heating up the plastic thus deforming it.
     
  15. the_boozer

    the_boozer no more VK

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    lose connections that draw lots of current get hot. Good chance to use those crimp links you showed me in another thread 4 or 5 joins?[​IMG]
     
  16. RWD4ever

    RWD4ever Member

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    I've had one of the fan relays die, can't remember which. I am sure none of the other relays gave trouble.
     

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