2019 Mazda CX-9 Cooling Fan Issue
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From: Northern California
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From: Washington, the state
A/C air conditioner condensor (hole in the line likely from overheating/overpressurization)
Last edited by PTguy; Jun 18, 2023 at 01:16 PM.
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From: oxford station
2018 cx9 gt
I did have the a/c lines vacuumed from a mechanic who then pressurized the lines with refrigerant.
Today I'm again having issues with the radiator fan kicking on. I'm not getting any voltage to the fan. Fuse is good. Not entirely sure which relay its on because they don't spell it out in the manual or inside the fuse/relay box.
Today I'm again having issues with the radiator fan kicking on. I'm not getting any voltage to the fan. Fuse is good. Not entirely sure which relay its on because they don't spell it out in the manual or inside the fuse/relay box.
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From: Denver, CO
2018 Mazda CX9 Overheating
My 2018 CX9 began overheating about three weeks ago. I took it to Mazda and they said it was not a known issue and there was no recall. My engine has been ruined and must be replaced to the tune of $9,800. I am pissed, especially when I read this thread before taking it to the dealership and it is definitely a known issue.
2019 Mazda CX-9 radiator fan not working. Randomly stoped working few weeks ago on vacation. Drove 1900 miles back home with no fans working.
Tested relay all is good.
Tested power to fans. 12-13 volts.
Checked all fuses and still nothing.
Replaced fan assembly today and still nothing working.
Any idea how to find issue? There is 3 wires for fan. Positive negative and signal wire.
Tested relay all is good.
Tested power to fans. 12-13 volts.
Checked all fuses and still nothing.
Replaced fan assembly today and still nothing working.
Any idea how to find issue? There is 3 wires for fan. Positive negative and signal wire.
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Joined: Oct 2023
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From: oxford station
My 2018 CX9 began overheating about three weeks ago. I took it to Mazda and they said it was not a known issue and there was no recall. My engine has been ruined and must be replaced to the tune of $9,800. I am pissed, especially when I read this thread before taking it to the dealership and it is definitely a known issue.
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From: Wisconsin
have you checked your VIN for the turbo/head TB? If in the group, call regional Mazda.
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From: oxford station
Hey! im definitely within the VIN range for the coolant leak, but i had that dame mechanic check and they said I didn't have any coolant leaks or codes showing. Not sure if I could pursue this unless it's showing signs of failure? also just passed 160,000km and well out of warranty. cheers
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From: Denver, CO
After reading and experiencing the same overheating issues as everyone else on this thread, I contacted the National Highway Transportation Safety Administration (NHTSA) and filed a complaint. Since this is a known issue with Mazda they should’ve issued a recall so customers were aware and could get it repaired. After completing the complaint, the agent assured me that they would investigate the issue and urged me to encourage others to file a complaint with them as well. He said the more information they have from multiple people, they better chance of getting a recall issued. If a recall is issued, any money spent out of pocket for repairs would be reimbursed by Mazda, regardless of when the expense was incurred.
My 2018 CX9 began overheating about three weeks ago. I took it to Mazda and they said it was not a known issue and there was no recall. My engine has been ruined and must be replaced to the tune of $9,800. I am pissed, especially when I read this thread before taking it to the dealership and it is definitely a known issue.
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After testing every fuse and relay I tested the temperature sensor and all checked out. I though for sure it’s a ecu issue. Then I decided to go through everything again. I know for sure the fan works because I bought a new one. So I started with power and ground again. Had a strong 13 volts. Then went to ground wire. After checking ground it seemed fine. But when I checked a different ground wire it was twice as strong on the Multi meter than the ground for the fan. So I traced the ground wire down and when inspecting connection there was very little contact due to paint around the bolt. I cleaned the paint off the area and everything worked like a charm. I guess the original threads inside the bolt was not enough ground. So cleaning the metal was all that was needed to give that perfect contact. Just a heads up if someone ever has any issues in the future. I know for sure if the dealership was to work on this they would have charged you for multiple parts and lots of labor. No codes were present so hard issue to find.
I checked the ground wire contact, and it was screwed with a non-conducting black bolt! I found a shiny metallic bolt elsewhere in the engine compartment which was clearly not used for any conductivity, and swapped with this black one so I'd have a proper 10mm bolt to attach the contact. After doing this the fan now turns on properly.
Amazing trouble shooting and huge time saver too!
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Feb 14, 2020 02:07 PM
