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Radiator Fan Switch

Posted by skibum12g 
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Erik G
Clifton Park, NY, USA   usa
1979 MG MGB
I have a '79B and things have been working pretty good with it. Yesterday it started to overheat and after looking into it, it appears that the switch has gone bad. My switch is not held in place by anything (zip tie or the like). How does the switch come out? Just pulling/prying? I'm going to try to replace it with an original since it looks like that's what's there now and it works just fine. I'm going to put a relay in to get the current off the switch.

Thanks for the help.

James D
beach, VA, USA   usa
1978 MG MGB "The Bee"
The switch just pulls out it is held in place by a grommet. Mine is the same way although the switch will pop out if you over fill the cooling system.


78..Bee, Leyland A/C (removed), Saturn 95 amp Alternator, Wire Wheels, Lumenition ignition, Weber 32/36, Four speed.

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Nels Monson
SE Wisconsin, USA   usa
I recently replaced this switch on my 79 with no problems. I think the important part is to make sure the radiator is completely full of water\coolant. The switch can pop out if there is an air pocket at the top of the radiator. You might want to "burp" any air out the the system by squeezing the bottom rad hose while refilling with coolant.

"It isn't that they can't see the solution. It is that they can't see the problem."
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Dan Howland
Park Rapids, Minnesota, USA   usa
1977 MG MGB "The "G"" ~ For Sale ! ~
Did you guys use the original switch of change to the 1980 switch with the spade type wire connections? I just bought the new style 1980 switch for my 77B and wondered if there was anything I should know before making the repair/replacement??

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Nels Monson
SE Wisconsin, USA   usa
I used the original round pin connector switch and have had no problems

"It isn't that they can't see the solution. It is that they can't see the problem."
- G.K. Chesterton

Ronn Kilby
El Cajon, California, USA   usa
1979 MG MGB "Sabrina"
On my 79 I used the new style with new grommet, silicone sealer and zip-tie through the fins. I had to use new spade crimp connectors since the original was a plug-in connector. So far no worries.

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