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Old 08-30-2006, 01:44 AM
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adjustable fan switch help please

Hello everyone,

I need some help with an buying a good adjustable thermostat fan switch. Their seems to be a lot available and a lot of price range. Most of all I want someting reliable. My current mr. gasket 190 switch seems pretty erratic, especially on its first turn on, last night it went up to 240 before it went on then it wont turn off till 160. I will probably be running a Lincoln MK8 fan, and from what I have read they pull alot of amps.

any help would be appreciated,
Thanks in advance
Jordon

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Old 08-30-2006, 04:14 AM
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Check for coolant flow and air locks before dismissing the part. Many factory fans won't cut in if the switch is only sensing air.
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Old 08-30-2006, 08:12 AM
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If you're going to be running a high-current fan, get a relay that will carry the current. Use your new temperature switch to control the relay similar to what is shown above.
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Old 08-30-2006, 09:33 AM
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Personally I would not trust such a function to a Mr. Gasket switch. Get a good one from Vintage Aire.

Vince
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Old 08-30-2006, 01:54 PM
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I had this problem too. I think it was caused by switching the fan directly instead of using a relay, as suggested above. Ultimately I trashed that system and used an old Mercedes switch that I installed in the intake manifold. It looks stock (an old-looking brass sensor), and works perfectly. Fan cuts in when coolant reaches 100C (212F) and cuts out at 90C (about 195F). It now switches a relay.
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Old 08-31-2006, 05:00 AM
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If the switch you describe is the big ugly one used on the M110,M115,M123 etc they weren't all that reliable, I changed scores of them from 1978 to about 1990. The later, smaller red topped swich was much better.
Personally I'd look at using 2 switches - low fan speed at 90c and high at 110c. Check dirty little hyundais, I think they have a 90 degree switch. Also Benzs have a beaut 60 amp relay (the grey one) with HUUUUGE pins.
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