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Here is a vid for the same fix where the plastic assembly failed while the gasket may still be ok:

I don't see the bolt. That big plastic part with the "X" on top fails...or more likely its gasket fails. The gasket from that plastic block to the head needs to be replaced. Possibly the entire plastic block as well if you don't trust it. If it were me and that plastic block wasn't too...

Your switch readings are spot on. So you need to verify wiring and the PCM it seems. Also those diagrams are from an FSM for a 2007 but they should be the same for 2008.

Some more:

What was the code? Whenever they say "we found a code" DEMAND a printout. Cruise is a funny thing, there are like a half dozen things that participate in it and it could be something like a faulty brake switch which might throw its own code. Did you try and pull it with a code reader? If you...

No, that does not look like something a head gasket would do. Looks like a leak coming from something above and dripping down.

If I'm doing a job like that, I'm replacing all the bushings too. Go to partsouq.com, put in your vin, then go to the interactive diagrams for your car and you should see all the part numbers in one of the diagrams for the control arm bushings. From there determine what to get from Rock Auto...

Depends on what they do. Since these cars aren't direct injection, and gasoline is and of itself a very good solvent and has cleaning additives, I've never bothered with any sort of fuel cleaner as I view them as a waste. DI engines are a whole other issue. If they are pulling off the...

Replace the thermostat again? Maybe it's not opening when things are getting hot and it's spiking the pressure? Also use only OEM Mazda parts. Lots of people having reoccurring issues with cheap Chinese parts from parts distributors.

Then bad radiator or bad water pump? There's only so much that will gradually fail like this.

Also, could be a failing water pump.

Your radiator fan is probably going bad if you can crank your heater and get the temps down. Or a bad radiator. Do these engines have electric fans? I wouldn't think it's exhaust in the coolant (although that's cheap to test) since it would probably go very hot very fast.

As an aside, a shop can probably do it for not too much. It's an easy repair for them. Getting the car like this is a problem though.

Build yourself a new lead. Find out what gauge wire that is and get some. Bigger will work but might be harder to work with. Smaller WILL NOT WORK. I would cut off a bit of the end of the harness and take it to compare with wherever you will get some. You can get wire by the foot at Home...

I don't know. Maybe? You'd have to diagnose it. I am really only familiar with the ABS module under the hood where the brake lines go in and out. We had that module go bad due to an internal valve sticking. This didn't produce a code or ABS light, just a very very soft pedal. If you have...

Yeah, the axle is probably not an issue. It'll be the sensor, wiring or ABS control module.