Mazda - Mazda5 :: 2007 - Radiator Fan Always Running


Oct 12, 2013

We have a 2007 Mazda5 we recently purchased used from a Mazda dealer. We learned later that the car has had numerous repairs the dealer didn't disclose, including a radiator fan replacement and possible new radiator. We noticed that the radiator fan was constantly running, even if the engine wasn't but the key was in the "on" position. The fan shut off when the AC was turned on. We took it to our local dealer for diagnostics who said that wires had been crossed in the original repair, that they connected the wires so that the fan would always run and that we needed a new fan control module.

We tried out a new module but it didn't fix the problem, fan still runs all the time and is very loud. Husband thinks the fan might be blowing in the wrong direction: currently towards the radiator. Another problem, which may or may not be related, is that the AC only works well at high vehicle speeds. When traveling in town, the AC blows very mediocre cool and moist air. According to the original owner, they put in a new AC compressor and a new pressure switch and the AC apparently worked well.

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I put a new 192 T-stat in there too, (OEM temp)

but, now it seems that the van is running hotter than it did before!

when I had the original rad in there, it would never get above the R in the Normal word... now it runs at about M (high middle)

Also, when I tryed to burp it, I'd top it off, but then it would put the extra in the overflow tank, and only stays full up to the very bottom of the filler neck.

this is a plastic radiator... is that what the difference is?

I used to be able to top off the old tank, and it would be right at the top whenever I opened the cap... not so with this one>?

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