Newer to the 4Runner

Love my 03 4Runner SR5 4.0 v6 250k miles. This is my second Toyota, the first is a 09 Matrix which i still own. Currently my 4Runner has some crazy engine whining squeeking going on. I've replaced idler and tensioner pulleys and now the sound is worse. I have run the stethoscope to every fathomable location and can not pinpoint the sound. Shade tree mechanic hoping the 4Runner community will throw some thoughts out there. Thanks.

 

Welcome.

 

It looks like a nice truck! Stay close to home, keep your cell phone charged and keep driving it. You’ll figure it out sooner or later.

 

Can we see some interior photos?

 

My guess is water pump or Alternator.

Post a video

 

Did you replace the belt?
Also take some WD40 and spray a little between the pulleys...one at a time with the engine running. Most WD 40 cans have a long tube so you can pinpoint your spray area. The one that stops squeaking may be the culprit. You can also look at the pulleys for wobble.

 

Just don’t get the WD40 on the belt because if you do you’ll need a new one!

 

I've made that mistake but not really had any issues. Usually I wash off any contamination.

 

Thanks you all.. after much trial and error and a new water pump alternator and power steering pump running smooth and quiet. All that said and done now when im running at temp defrostvents and floor blow hot on driver side and cold on passenger side. I learn as i go and was going to reverse frlush the heater core. How do i determine inlet and outlet for the heater core? I feel the answer is right in front of me.. lol 03 4Runner SR5 4.0