Engine still squeaking after replacing water pump and tensioner
New cooling and belt components often fail to resolve an idle squeak because residual load issues — such as a failing AC compressor or auxiliary pulley alignment — keep putting uneven tension on the belt system. This leaves drivers dealing with persistent noises and vibrations that defy straightforward part-swapping fixes.
Core Friction Pattern
Analysis of 8 peer accounts across online developer and community forums reveals that “Engine still squeaking after replacing water pump and tensioner” repeatedly surfaces due to edge-case mismatches between standard defaults and real-world environments. Standard troubleshooting frequently falls short, compelling practitioners to develop custom workarounds.
+10 alternative community-tested workarounds cataloged below.
What the numbers show
Counted from the threads quoted below. How we count
- People have been saying this in most months since September 2026.
- This comes up 14.9× more often in r/AskMechanics than across the site as a whole.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
Engine still squeaking after replacing water pump and tensioner
- 1Carefully spraying individual bearings with a small shot of WD-40 to see if the noise quiets downDid this help you?
- 2Replacing engine mounts one by oneDid this help you?
- 3Inspecting engine movement while revving under the hoodDid this help you?
- 4Posting on mechanic advice forums to diagnose the noiseDid this help you?
- 5Checking for air leaks or listening for cam actuator tickingDid this help you?
- 6Checking pulleys, belts, fan clutch, and a/c compressorDid this help you?
- 7Considering selling the vehicleDid this help you?
- 8Taking videos from different angles (e.g., placing the phone on the ground under the front of the car) to help isolate where the sound is coming from.Did this help you?
- 9changing the serpentine beltDid this help you?
- 10Removing the belt and testing the engine again to isolate the source, and inspecting each individual pulley.Did this help you?
- 11Watching YouTube videos to figure out and handle mechanical repairs independently.Did this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Just changed the serpentine belt but now it’s getting that clicking noise whenever I accelerate or rev up the engine.”source ↗
“after replacing the water pump, tensioner, friction wheel, and valve cover when it reaches operating temperature it starts to squeak at idle.”source ↗
“It gets more consistent and louder when the AC is turned on. AC doesn’t work to add to that”source ↗
“My engine has a new ticking noise (trying to avoid the dreaded knock word) and I’m trying to figure out if my 2016 Hyundai accent is cooked or not.”source ↗
“Just replaced the manifold cat because it blew up on me and the car went into limp mode so I’m hoping it’s nothing or at least related to that somehow.”source ↗
“Mostly noticeable when idling, and goes away at about 1000 rpms or so.”source ↗
“Can’t really hear it in the engine bay, but it sounds like a damn diesel in the cabin.”source ↗
“I just changed my serpentine belt thinking the squealing or squeaking noise might disappear. What else could be the problem? Is it the idler pulley or the tensioner?”source ↗
“Also the sound gets more louder when i hit gas around 1200-1900 RPM”source ↗
“I was also thinking it was the idler or tensioner. I just wanted confirmation before I started diving into it.”source ↗
“My 2020 Holden Astra RS 1.6L turbo 100k kms has recently started making this strange squeaking/chirping noise.”source ↗
“The strange thing is that it doesn't start immediately after the car has been sitting overnight. It usually starts after around 10–15 minutes of driving, and once it starts, the noise continues while I am driving for the rest of the day.”source ↗
“If I turn the car off and leave it for several hours, the noise disappears again until the car has been driven for a while.”source ↗
“After re-assembling/running the engine, the car makes a strange thunking noise after I cut power to the engine. The noise is consistent and does it after every shutoff. What could this be, and is this concerning?”source ↗
“I’ve been dealing with a low rumbling/vibration under light acceleration, mainly around 20–40 mph. It sounds like a rattling/purring noise, and I can feel some vibration through the front of the car”source ↗
“The noise has decreased slightly, but I can still hear it while driving, and it seems more noticeable on the left side.”source ↗
“Any insight would be appreciated as I’m so tired of driving with all the rattling and vibrating!”source ↗
“2008 Ford F-250 Super Duty 6.4 XLT Has new transmission and turbo, it drives but makes this screeching sound.”source ↗
“Trying to get some advice for my dad. He thinks it might be the flywheel/flexplate (idk type of transmission) He’s considering selling it but is unsure what it would even go for (if anyone would even buy it)”source ↗
Where this came up
People with this problem also raised
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