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Overheating - I'm stumped

Discussion in '1st Gen. Tacomas (1995-2004)' started by jlp_2kP, Jul 16, 2016.

  1. Jul 16, 2016 at 7:50 AM
    #1
    jlp_2kP

    jlp_2kP [OP] Member

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    Houston, TX
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    2000 Prerunner 3.4
    I have a 6 cylinder 2000 Prerunner wit 185k miles that has been overheating and I can't figure it out.

    My symptoms are:
    • I can drive for about 45 minutes on regular roads (35 - 45 mph) before the gauge goes up
    • I can drive about 10 minutes on the freeway (65 - 75 mph)
    • The overflow res boils when it's hot
    • The heater blows hot
    What I've done:
    • Changed the fan clutch
    • Changed thermostat twice
    • Changed radiator cap twice
    • Changed upper and lower hose
    • Had a mechanic pressure test it. He said it was fine.
    • I did a block test. Fluid stayed blue.
    • Had the mechanic do a block test in case I did it wrong. Fluid stayed blue.
    • Changed water pump with 90k service.
    • Had the cooling system flushed when the water pump/timing belt were getting done.
    The radiator was replaced about 5 years ago but at this point I'm not sure what else it could be. Anyone have any ideas? Thanks in advance.
     
  2. Jul 16, 2016 at 7:55 AM
    #2
    wilcam47

    wilcam47 Well-Known Member

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    Where ever I go, there I am...
    only thing I can think of is the radiator is clogged on the inside eventhough you did a flush its not flowing good. also check to see if there stuff/debris in the radiator fins....

    Maybe you got a bad clutch fan from the factory?
     
    jlp_2kP [OP] likes this.
  3. Jul 16, 2016 at 8:04 AM
    #3
    jlp_2kP

    jlp_2kP [OP] Member

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    Thanks for the reply. I looked through the grill and can see the fan/engine through through a/c condenser and radiator, so the fins don't appear to be clogged. The clutch seems like it works fine. The fan blows hard at startup and is very difficult to stop with a rolled up magazine. I'll remove the shroud and spray the fins out with a hose to see if that helps.
     
  4. Jul 16, 2016 at 9:59 AM
    #4
    keakar

    keakar Well-Known Member

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    louisiana
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    used to have - 99 2.4L I4 5 lug & 04 prerunner v6
    with the list of things you have done, it definitely comes down to it must have blocked water passages within the radiator itself I think

    time for a new radiator
     
    jlp_2kP [OP] likes this.
  5. Jul 16, 2016 at 10:49 AM
    #5
    neatoneto

    neatoneto Well-Known Member

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    Had similar issue on my 98 nissan pathfinder. replaced the rad which fixed it. either that or water pump.
     
  6. Jul 16, 2016 at 11:24 AM
    #6
    jlp_2kP

    jlp_2kP [OP] Member

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    Thanks for the input wilcam, keakar, and neato. I washed out the radiator fins and there wasn't much there other than a few pine needles and feathers. A few of the fins were bent, but nothing major. I guess it's clogged and I'm replacing the radiator. Any recommendations as to the brand to get? Are any of the three listed below okay?

    Koyorad C1755: https://www.amazon.com/Koyorad-C1755-Radiator/dp/B00PW2OBBK
    Spectra CU1755: https://www.amazon.com/Spectra-Premium-CU1755-Complete-Radiator/dp/B000C7TU1Q
    Shepherd: https://www.amazon.com/Shepherd-Performance-Alumium-Engine-Radiator/dp/B0073MFS3W
     
  7. Jul 16, 2016 at 2:01 PM
    #7
    keakar

    keakar Well-Known Member

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    used to have - 99 2.4L I4 5 lug & 04 prerunner v6
    take very careful measurements of your old radiator and compare to ones you look at

    many places make replacement radiators but not all fit the same and some trucks have "slightly" different sized radiators (like a half inch taller or wider) depending on things like 4wd, 2wd, trd, or 5 lug and even with the correct everything checked on model and part number needed to fit it, sometimes a rad they say fits wont measure the same and you will need to avoid that brand and model number so the most important factor is physical dimensions rather then what they say fits your truck.

    just to be clear, what I am saying is, there are good brands of rads but the info on what they fit may not be totally accurate in every case so triple check physical dimensions before ordering and even then its common for the screw holes to be offset slightly and be a real bitch to get started without stripping them so a good FYI is to get them all threads started about 1/4" before screwing any of them in more then that.

    also have a good long 12" ratchet extension with wobble tip and a u-joint connector added to it because two of the bolts you don't have clear access to line up a straight connection on
     
  8. Jul 16, 2016 at 2:11 PM
    #8
    jlp_2kP

    jlp_2kP [OP] Member

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    Thanks for the tips. I'll be sure to take measurements before I order.
     
  9. Jul 16, 2016 at 2:13 PM
    #9
    Bloodhound

    Bloodhound Banned from the Pics Thread

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    I have had issues in the past with a girlfriends Blazer where after having the radiator cap replaced it wasn't long enough and would not seal to the radiator causing a similar issue, i.e., truck got hot, smelled of antifreeze (due to venting off). I went through about 4 radiator caps before I found one that actually sealed/seated. Diagnosed by squeezing the upper hose to verify system building pressure.
     
  10. Jul 17, 2016 at 4:48 AM
    #10
    JPinFL

    JPinFL Well-Known Member

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    I got a Spectra from Pepboys a few years ago. No issues at all with the installation. All of the holes matched perfectly.

    The reasons I went with Spectra? I needed a radiator asap. Pepboys had it in stock.
     
  11. Jul 17, 2016 at 5:44 PM
    #11
    Digiratus

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    Waterpump. At 185K, it is time to replace it again. It could be worn impellers. This would show up at higher RPMs
     
  12. Jul 17, 2016 at 7:38 PM
    #12
    jlp_2kP

    jlp_2kP [OP] Member

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    Bloodhound: The cap seems fine. I've tried two Toyota caps and one autozone cap and all seem to seal properly.
    Digiratus: The waterpump was changed about 100 miles ago with the timing belt after it started leaking.

    Hopefully the koyo radiator I ordered will solve the problem. I will report back once it's in.
     
  13. Jul 17, 2016 at 7:42 PM
    #13
    nickj604

    nickj604 Well-Known Member

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    Before you go out and replace your rad try back flushing it. It could solve your problem and save you some $$
     
  14. Jul 18, 2016 at 3:59 AM
    #14
    johnny3

    johnny3 Well-Known Member

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    I think the Koyo is the better radiator.
     
  15. Jul 23, 2016 at 2:14 PM
    #15
    jlp_2kP

    jlp_2kP [OP] Member

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    I finally got the radiator swapped today. I order a Koyo from an Amazon seller but they sent a smaller radiator of a different brand. I ordered a Koyo with a 22 5/8 core and ended up with a 4x4 radiator with a 20 3/4 core. I'm not sure what brand it was. It was labelled WK1755PA26 and had a picture of a shark on the box. I asked them what happened and they said they were out of the Koyo but the other one would fit the same. I wasn't convinced so I sent that one back and got a Spectra from the local Autozone.

    I went in through the grill with a 1/4 extension to get the top bolts and went in under the bumper to get the bottom bolts. I put the extension through the top slot of the grill and snapped on the socket on the other side since I couldn't get the 12mm socket through the grill. I still ended up breaking off two of the grill clips trying to fit my hand behind the grill to grab the bolts and take the socket off the extension. The grill is holding on okay, so I won't worry about getting replacements for now. I saw that someone else used sharpies to plug the atf cooler lines. I don't have sharpies but wire nuts plugged the lines just fine.

    Overall, it was a little tougher to do than I expected but it wasn't bad. I had a little trouble because I have large hands and the lower bolts were hard to get to. It was 97 degrees out today with a heat index of 107, so that didn't help either.

    Previously, I could only drive about 10 minutes on the freeway before the gauge went up to 3/4 and I had to start looking for somewhere to pull over. I took a 30 minute test drive on and off the freeway and the temp gauge stayed right in the middle, so it looks like the problem is solved.

    Thank all of you guys for your input.
     
    Justified and wilcam47 like this.
  16. Jul 23, 2016 at 3:08 PM
    #16
    neatoneto

    neatoneto Well-Known Member

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    Awesome to hear! :thumbsup:
     
  17. Jul 23, 2016 at 3:16 PM
    #17
    ppham444

    ppham444 Well-Known Member

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    I had the same problem with my 96 Tacoma. The radiator was internally clogged. Swapped it out for a new one and solved the problem.
     
  18. Jul 23, 2016 at 3:21 PM
    #18
    bry838

    bry838 Well-Known Member

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    Good deal! Ive had the same issue before and did exactly what you did! Replaced everything but the radiator. So naturally it was the radiator that was the problem. Same as you it flowed just fine so it appeared but those lil passage ways on the inside (not out)were clogged just enough that it would gradually get hot, especially pulling a grade. Drove me nuts till i finally changed the rad and been fine ever since!
     
  19. Jul 23, 2016 at 9:19 PM
    #19
    wilcam47

    wilcam47 Well-Known Member

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    Where ever I go, there I am...
    FTW ;)
     
    neatoneto likes this.

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