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The Mitsubishi Pajero Owners ClubŪ The Mitsubishi Pajero, Shogun, Montero, Challenger, Raider and EVO 4x4 Owner's Club
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dhammika ****
Age: 49 Zodiac: Joined: 16 May 2015 Posts: 408 Location: Sri Lanka
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Posted: Tue Feb 07, 2017 13:41 Post subject: |
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peteinchad wrote: |
Strange things happen - like my heater blowing cold air when turning left (but only occasionally!!) |
This has an explanation. Hot/Cold air mix is controlled by set of flaps. Flaps are connected to a shaft with small screws and motor will control the flap open/close with set of levers. Layer of foam glued to each flap for proper sealing. With the time that layer will fall off and flaps get rusted and there will be a free play between shafts and flaps, so when vents are closed they are not tightly closed. With the centrifugal force with cornering some may closed vents will be opened briefly.
I recently disassembled, blower unit and cooler unit and repaired the flaps. Applied rust protection, put some new foam layer and fixed the free play by tightening the screws. |
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Posted: Tue Feb 07, 2017 13:41 Post subject: Google Ads keep the POCUK free to join! |
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peteinchad LifeTime Member
Joined: 07 Jan 2013 Posts: 15079 Location: UK
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Posted: Tue Feb 07, 2017 13:52 Post subject: |
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I think I will wait until the Summer to look at it - too cold at the moment.
Of course it will be impossible to test it in the hot weather! |
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dhammika ****
Age: 49 Zodiac: Joined: 16 May 2015 Posts: 408 Location: Sri Lanka
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Posted: Tue Feb 07, 2017 17:43 Post subject: |
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Eurekaaaaaaaaaaaaaaaa
Found the problem. It was a relay.
I connected a +ve wire from the battery and fed into the blower socket and it starts to work, all three speeds get selected, but even after turning A/C off blower was running at low speed. Because of that I thought that there should be some other switching mechanism for +ve supply, so first disconnected the condenser fan, so I can clearly here relay noises, after that when turning on the A/C and when selecting speeds I here relay noises and then found the two relays located on top of the cooler.
Eventhough wiring diagram shows direct connections via blower switch, actually switch activates those two relays
1. To turn on and off the Blower - The blue wire from the IGN relay connected to this one, and then fed to the blower socket. As soon as this is energized, Low speed is selected
2. To select Medium or High speed (This is two way relay I guess)
I found first relay is faulty, when I tap it few times blower starts to work.
Will try to modify the circuit diagram and publish it here
Thanks Pete for the support.. |
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peteinchad LifeTime Member
Joined: 07 Jan 2013 Posts: 15079 Location: UK
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Posted: Tue Feb 07, 2017 18:07 Post subject: |
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I'm glad you found it - not easy when the wiring diagram leaves important bits out
Somewhere there must be a definitive wiring diagram that is actually correct.
Well done - you could have been at that problem for weeks!! |
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Berry272 *
Age: 66 Zodiac: Joined: 23 Feb 2020 Posts: 11 Location: Davenham cheshire
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Posted: Sat Mar 14, 2020 14:13 Post subject: Blower fan relays |
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Hi dehammika it's been a while since your post but I have a similar issue the dash heater controls light up the fan works but only when connected to 12v as I just removed and tested it. Could you be a bit more specific where these controlling relays are located not sure what you mean by above the cooler?? Cheers |
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dhammika ****
Age: 49 Zodiac: Joined: 16 May 2015 Posts: 408 Location: Sri Lanka
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Posted: Mon Mar 30, 2020 19:01 Post subject: |
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Relays are located on top of the cooler (Evaporator) box.
My AC control unit is an electronically controlled one with buttons. It may be different for a manual controller with rotating knobs. |
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