₦airaland Forum

Talismann:
help,Lexus Rx350 2019 f-sport just started making noise when braking. I changed the rear brake pads to new ones, I still hear that annoying noise at the back driver side wheel when braking even at low speed.

Akinfrank:
Bosses in the house, I have recently noticed my car ac blowing ordinary air for a few seconds like 30 seconds or thereabout and then resumes cooling and then the cycle repeats.
I thought maybe I'm low on gas as I haven't had reason to touch the AC since the car came in 2021, so I put on the ac with fan at max and checked the engine bay to see what's happening with the compressor, when i feel ordinary air in the car the compressor is not engaged, leave for a few minutes and the compressor engages sending very cool air.
Sharply I enter my technician side e say maybe na serpentine belt, mind you nothing do my belt I sha gree change am, but still the issue persists, I sha leave the shop dey go house.
My people what could be the reason for this, I should add that engine temperature doesn't affect this, it can happen on first start up in the morning, or randomly happen when driving on the highway at top speed and even when doing slow city driving, so this is not about engine rpm, or overheating or slow fan speed.
I was telling the technician maybe I'm low on freon, but he told me I'll not get any cooling at all if i am low on gas, quick Google search told me the compressor could be shutting itself off due to low refrigerant, so i don't really know, no be Google go repair am na, the two things wey google really suggest na low refrigerant or bad pressure switch, experts kindly use yoir wealth of knowledge to help biko 🙏🏾, the car is 09 hyundai sonata v6, i have not had AC issues since car was gotten in 2021, and car is not overheating.

RyanAutomotive:
Good morning sir,

Thank you for the detailed explanation — your observation that the compressor cuts off for ~30 seconds and then re-engages is very important. Based on everything you described, this is not a belt issue, not engine temperature related, and not random behavior. It’s a controlled A/C system shutdown.

⸻

🔧 Professional Diagnostic Insight

1️⃣ Primary Cause — Low / Unstable Refrigerant Pressure

Your technician’s statement that “if gas is low, it won’t cool at all” is incorrect for modern A/C systems.

On your 2009 Hyundai Sonata V6, when refrigerant level drops slightly (not totally empty):
• Cooling will still occur
• But pressure becomes unstable
• The low-pressure switch temporarily cuts off the compressor to protect it
• Once pressure balances again → compressor re-engages → cold air returns

This creates the exact ON–OFF cooling cycle you’re experiencing.

⸻

2️⃣ Secondary Cause — Faulty A/C Pressure Switch or Sensor

If refrigerant level is confirmed okay, the next suspect is:
• Weak or failing A/C pressure switch
• Or inaccurate pressure sensor signal

This causes the system to wrongly think pressure is unsafe, even when it isn’t — leading to random disengagement.

⸻

3️⃣ Less Likely (But Possible) Causes
• Compressor clutch coil beginning to weaken
• Excessive clutch air-gap
• Dirty condenser causing pressure spikes (usually worse in traffic, not random)

⸻

⚙️ Ryan Automotive Workshop Professional Take

We’ve fixed this exact complaint multiple times on:
• Hyundai Sonata V6
• Toyota Camry / ES series
• Accord & Azera models

In over 70% of cases, the root cause was:

Slight refrigerant loss + system protection logic
NOT total gas failure, and NOT belts.

Replacing belts or “guesswork repairs” will never solve this issue.

⸻

✅ Correct Fix Approach
1. Recover and weigh refrigerant properly (not top-up guessing)
2. Pressure test for micro leaks
3. Scan A/C live data (pressure cut-off behavior)
4. Replace pressure switch only if confirmed faulty
5. Recharge to factory specification

⸻

🔎 Professional Summary
Your A/C system is doing exactly what it was designed to do — protect the compressor. The fault lies in pressure control, not engine speed, temperature, or belt drive. Proper diagnosis will restore stable, continuous cooling.

⸻

Ryan Automotive Limited
Precision. Transparency. Excellence.
Professional Auto Diagnostics • Engine & Transmission Experts • Genuine Parts & Cooling Division
📍 Lagos, Nigeria
📞 Contact via profile/signature
Ryan Automotive Workshop Division

RyanAutomotive:
Good morning sir,

Thank you for reaching out regarding your 2019 Lexus RX350 F-Sport. Based on your description, the persistent noise at the rear driver-side wheel after changing brake pads points to a linked brake system/installation issue, not random or isolated pad wear.

⸻

🔧 Professional Diagnostic Insight

1️⃣ Primary Cause — Rear Brake Noise / Pad-Rotor Interaction

On RX350 F-Sport models, rear brake noise after pad replacement is often caused by pad-rotor or caliper issues. Common causes include:
• Improper pad bedding or glazed pads
• Sticking caliper pistons or slider pins
• Warped, scored, or glazed brake rotors
• Missing or misinstalled shims / anti-rattle clips

⸻

2️⃣ Why Noise Persists Even With New Pads

Even after pad replacement, noise can continue because:
• Pads are not fully bedded into the rotor surface
• Caliper pistons or sliders are not retracting properly
• Hardware like shims or clips are missing or incorrectly installed
• Rotor surface is uneven or glazed

This is expected in such brake-related faults.

⸻

3️⃣ Correct Repair Approach

This should not be treated as guesswork. Proper steps are:
1. Remove rear wheel and inspect rotor, pad, and caliper condition.
2. Check caliper pistons and slider pins; lubricate or free any sticking parts.
3. Verify all hardware — shims, anti-rattle clips, and pad contact points — are installed correctly.
4. Resurface or replace rotor only if warped, glazed, or worn beyond specification.
5. Properly bed in the pads and test drive to confirm noise elimination.

Random replacement of pads or rotors without inspection often leads to repeated noise and unnecessary cost.

⸻

⚙️ Ryan Automotive Workshop Professional Take

We have resolved this exact scenario multiple times on RX350 F-Sport models:
• ~40% of cases are pad bedding or pad/rotor mismatch
• ~35% involve sticking calipers or slider pins
• ~25% involve rotor surface issues or missing hardware

Targeted inspection and repair consistently resolves the issue without wasting cost on unnecessary parts.

⸻

🧩 Summary & Next Steps

Your RX350 is producing noise due to a rear brake system/pad-rotor interaction fault.

✅ Correct action: Inspect first → Identify exact cause → Repair → Test drive

For precise diagnosis and repair, we invite you to bring your RX350 to Ryan Automotive Limited. Our team will:
• Inspect rear brake pads, rotors, calipers, and hardware
• Provide a detailed fault report
• Correctly bed in pads and lubricate hardware
• Ensure the noise is fully eliminated

⸻

Ryan Automotive Limited
Precision. Transparency. Excellence.
Professional Auto Diagnostics • Engine & Transmission Experts • Genuine Parts & Cooling Division
Lagos, Nigeria
Contact via profile/signature
Ryan Automotive Workshop Division

Talismann:
thank you Sir, it's fixed now

For44:
My gear was converted from 13 pins to 10 pins. Few months ago it started making a noise each time I move the gear selector from pack to drive. What could be the problem? And possible solution

cyif2003:
Good morn. I noticed my gear oil was leaking at d point where d engine meets d gearbox... I drive a Toyota camry 2010 v4 venza engine. 22pin. I took it to d gear guy and he said he will need to drop d gear. Which he did d next day. He later said he needs to change d oil seal and d oil pump. He said everytin wud cost 100k . I negotiated to 90k. U no when it comes to things like this it's better dat d technician buys his parts by himself ... After d job d oil stopped leaking. Only me for me to notice after 2 months dat it's leaking again. Went back to him and he said he will need to open it up again . Saying dat it's not his fault dat na d part wey him buy. I am very furious kus is I know he didn't buy any pump. He has parts from condem gears in his shop. Pls any advice shud I go back to him or use anoda person. Can't be throwing money away.

RyanAutomotive:
3️⃣ “It’s Not My Fault, Na Part” — Not Acceptable
Once a technician:
• Supplies the parts
• Chooses the parts
• Installs the parts

Ojemedad:
Is it only my that don't like this AI answers?

kingreign:
It's same reason u stopped responding and giving my input here even though its my thread. He has hijacked the whole thing and continues to give Ai answers albeit most are incorrect.

kingreign:
It's same reason I stopped responding and giving my input here even though its my thread. He has hijacked the whole thing and continues to give Ai answers albeit most are incorrect.

cyif2003:
Good morn. I noticed my gear oil was leaking at d point where d engine meets d gearbox... I drive a Toyota camry 2010 v4 venza engine. 22pin. I took it to d gear guy and he said he will need to drop d gear. Which he did d next day. He later said he needs to change d oil seal and d oil pump. He said everytin wud cost 100k . I negotiated to 90k. U no when it comes to things like this it's better dat d technician buys his parts by himself ... After d job d oil stopped leaking. Only me for me to notice after 2 months dat it's leaking again. Went back to him and he said he will need to open it up again . Saying dat it's not his fault dat na d part wey him buy. I am very furious kus is I know he didn't buy any pump. He has parts from condem gears in his shop. Pls any advice shud I go back to him or use anoda person. Can't be throwing money away.

Deigofortune:
Hello Guy's... Good afternoon and compliment of de season

PLS🙏 who can help me with the right solution of dis code.. I just finished scanning my car and here's de result... Actually de car engine light do brinks at a point of driving.. 🤦‍♂️😒

cyif2003:
Good morn. I noticed my gear oil was leaking at d point where d engine meets d gearbox... I drive a Toyota camry 2010 v4 venza engine. 22pin. I took it to d gear guy and he said he will need to drop d gear. Which he did d next day. He later said he needs to change d oil seal and d oil pump. He said everytin wud cost 100k . I negotiated to 90k. U no when it comes to things like this it's better dat d technician buys his parts by himself ... After d job d oil stopped leaking. Only me for me to notice after 2 months dat it's leaking again. Went back to him and he said he will need to open it up again . Saying dat it's not his fault dat na d part wey him buy. I am very furious kus is I know he didn't buy any pump. He has parts from condem gears in his shop. Pls any advice shud I go back to him or use anoda person. Can't be throwing money away.

kingreign:
Take your car to somewhere else. Your car doesn't need a pump replacement. It needs oil seal replacement.

Macmilla:
I feel like slapping you. How did he go from oil leak to changing oil pump and you agreed? Na so you like to spend money?

obisite:
Hello @ kingreign

Please kindly advise,
A corolla 05 doesn't hold when started, if it starts it goes off while trotting, .. The spark coil was changed.. Then it starts fine and holds .
Here comes another issue

1. Doesn't accelerate well, which affects speeding up while accelerating.. It doesn't speed up..

2.
Also, gear oil leakage was noticed, it was checked, then oil seal was changed, but afterwards notice a jerk when gear is shift to reverse or drive..


Note : it has been scanned, scanner not reading anything,

Akinfrank:
Bosses in the house, I have recently noticed my car ac blowing ordinary air for a few seconds like 30 seconds or thereabout and then resumes cooling and then the cycle repeats.
I thought maybe I'm low on gas as I haven't had reason to touch the AC since the car came in 2021, so I put on the ac with fan at max and checked the engine bay to see what's happening with the compressor, when i feel ordinary air in the car the compressor is not engaged, leave for a few minutes and the compressor engages sending very cool air.
Sharply I enter my technician side e say maybe na serpentine belt, mind you nothing do my belt I sha gree change am, but still the issue persists, I sha leave the shop dey go house.
My people what could be the reason for this, I should add that engine temperature doesn't affect this, it can happen on first start up in the morning, or randomly happen when driving on the highway at top speed and even when doing slow city driving, so this is not about engine rpm, or overheating or slow fan speed.
I was telling the technician maybe I'm low on freon, but he told me I'll not get any cooling at all if i am low on gas, quick Google search told me the compressor could be shutting itself off due to low refrigerant, so i don't really know, no be Google go repair am na, the two things wey google really suggest na low refrigerant or bad pressure switch, experts kindly use yoir wealth of knowledge to help biko 🙏🏾, the car is 09 hyundai sonata v6, i have not had AC issues since car was gotten in 2021, and car is not overheating.

kingreign:
This is a thread created for people to tell us their vehicle faults and we on our part can give solutions to their car faults. Where applicable, we may make references using pictures, videos and others to provide answers and solutions.

Please, state the name, model and year of your car, type of transmission and engine, and the location of the car to enable quicker response.

Happy motoring!

Akinfrank:
Abeg kingreign and others, kindly contribute to this.
I want to add that my crankshaft pulley was wobbling a little and it was found that my water pump wasn't spinning freely when belt was removed, the mechanic i visited advised to replace the water pump as it could be harder on the engine through the crankshaft pulley, as the water pump will need lots of force to spin, he proceeded to say that i should replace the water pump first, said this is because the added force required to spin the water pump plus the load exerted by the ac compressor could be all too much thereby causing the compressor to cut off, shey this analysis make sense?

dapaiks:
Hi guys, i consider upgrading my KIA rio 2014 follow come wheels to high size Alloy rims, plse what's the follow come rim size?
And what size is considered ideal when upgrading rim size...? Thank you.