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2008 Tundra 5.7 temp issue.

Discussion in 'General Tundra Discussion' started by Primosoup, Jan 1, 2020.

  1. Aug 22, 2020 at 6:11 PM
    #61
    busterg

    busterg New Member

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    not sure, i just ordered EPAuto Spill Proof Radiator Coolant Filling Funnel Kit from Amazon. I am going to put it on ramps lift front end, setup funnel w/ heater on let it run and watch temps on my obd torque app, message the upper rad hose till temp hits 195f. then I will wait another 5 min idle then hold rev engine to 2000 rpms for about 20 seconds 5 times make sure i don't over spill my coolant. I still have fan clutch on the way from dealership, truck has 230k miles original fan clutch, may as well replace it. if temps stay the same after all that, then ill sell it.. .getting to frustrated with it. my gauge doesn't overheat, but I noticed the temp on my obd and it didn't seem normal too me. I also forgot to mention in my previous post, I replaced the condenser as well, so no bent fins or any blockage for air to flow to the rad. I will update you guys next week with my test results.
     
  2. Aug 22, 2020 at 6:17 PM
    #62
    blanchard7684

    blanchard7684 New Member

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    Something easy to try : keep radiator cap off all night see if that does anything. Maybe even raise front a bit.
     
  3. Aug 22, 2020 at 6:49 PM
    #63
    jtwags

    jtwags Concrete jungle

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    Have you tested the coolant for head gasket leak using chemical test in tube, cant remember name of it off hand.

    EDIT: looks like you had coolant checked for hydrocarbons already.
     
  4. Aug 23, 2020 at 10:16 AM
    #64
    busterg

    busterg New Member

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    I will run another block test again today when i get my funnel, from Amazon. I did some reading around and backtracked my parts i ordered to replace my cooling system. water pump is aisin, radiator is generic keystone from advance auto parts, thermostat is motorad from advance auto parts. the same thermostat that sells for $43 on advance autoparts sells for $20 on amazon same make and model, but with crappy reviews. in the reviews someone complained that there tundra ran 20deg hotter after using that thermostat. So today I ordered from the dealership the oem thermostat. When i get that in I will replace that, also look for any debris blockage inside the housing where the thermostat sits.
     
  5. Aug 23, 2020 at 10:21 AM
    #65
    busterg

    busterg New Member

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    here are two similar reviews from Amazon reference to the motorad thermostat

    Top reviews
    [​IMG]
    Brad

    1.0 out of 5 stars Not 180°. Activates safety feature
    Reviewed in the United States on December 26, 2017
    Verified Purchase
    I finally got around to installing this a few weeks ago and I seem to be having the same results at Carey. Description says 180°f. But, according to the torque app, my truck is running between 210°f-220°f. No good...as it keeps activating the HVAC "safety feature". When the coolant is too hot, the HVAC will automatically go into recirculation mode until the coolant cools down to 210°.

    I was able to replicate this multiple times. " safety feature" kicks in when the temperature reaches 215°. Accelerate to cool it down, feature turns off..

    UPDATE: after having this installed for a little over a year, the tabs inside the housing that hold the thermostat in place BROKE and caused the thermostat to fail and throw a check engine light. As expensive as these motors are, don't cheap out...buy the toyota factory part. It isn't that much more expensive. I did and I'm no longer having issues.
    Helpful
    Comment Report abuse
    [​IMG]
    carey

    1.0 out of 5 stars Thermostat was installed on my 08 tundra and it made ...
    Reviewed in the United States on March 29, 2015
    Verified Purchase
    Thermostat was installed on my 08 tundra and it made it run 20 degrees hotter. Replaced with factory thermostat and runs back where it should at 182-190 Fahrenheit. May work on other engines but did not meet factory specs.
    One person found this helpful
     
  6. Aug 23, 2020 at 10:36 AM
    #66
    jtwags

    jtwags Concrete jungle

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    Looks like a good plan, hope it works out for you, sux dealing with issue like this.

    Have similar type of nagging issue with old f150 4wd intermittently working. After trying pretty much everything it looks like I need to pull the GEM module and look for water intrusion and clean up electrical pathway plates, pia.
     
  7. Aug 23, 2020 at 6:05 PM
    #67
    busterg

    busterg New Member

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    Welp, I tried to burp the truck with no success, im leaning towards the thermostat. truck temp climbs when idle with ac on, I noticed there was some play in the clutch fan. I ran the test for more than 1 1/2 hours with heat on, and truck in incline.

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  8. Aug 23, 2020 at 6:17 PM
    #68
    Wynnded

    Wynnded What MPG...

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    Have you tried seeing if squeezing the lower radiator hose burps up any air?
     
  9. Aug 23, 2020 at 6:34 PM
    #69
    blackdemon_tt

    blackdemon_tt Battery Slayer

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    Any chance your O2 sensors are going bad? I remember through my struggle with my car's CEL, the last CEL it triggered was not entering close loop and remaining in open loop as if the computer was still reading the engine was cold even though it was up to temperature and was not opening the thermostat to begin the cooling process.... May want to troubleshoot them as well.. Since it appears you have gone through your whole cooling system and no change.
     
  10. Aug 24, 2020 at 5:45 AM
    #70
    blanchard7684

    blanchard7684 New Member

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    I don't see any real issue with those temps unless I'm not seeing something. Was this with a lower temp thermostat?
     
    Sundown5oh likes this.
  11. Aug 24, 2020 at 6:44 AM
    #71
    zeekevin

    zeekevin New Member

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    I replaced my thermostat twice both oem ones. Replaced my radiator with a full aluminum koyo one and a new fan clutch. And I’m still in the same boat.

    I may try doing a vacuum bleed again or maybe double check the water pump as reving the engine in neutral while in motion drops the temps pretty quick. I went with a aftermarket asin water pump, I may get an oem one and pray for the best.
     
  12. Aug 24, 2020 at 11:40 AM
    #72
    busterg

    busterg New Member

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    @blanchard7684
    From what I read normal operating temp is 195F. going down the freeway 75mph unloaded no weight I see 208F. I have the ac on that contributes some heat but with it off is only 2degree difference. The goal is to tow 4500 lbs trailer w/ the family, im afraid with the temps i have now will only increase with load. I don't want to put my family or anyone in danger on the road, there are many 1 lane steep climbs here in AZ combine that w/ 100+ degree weather.
     
  13. Aug 24, 2020 at 12:00 PM
    #73
    blanchard7684

    blanchard7684 New Member

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    that might be a wee bit high.

    my 2019 runs 204-205 when pushing it hard in 103-105 ambient. Cools off fast though.

    I would try a 190 thermostat and see if that works.

    was the radiator a drop in replacement for your engine and configuration?

    also noticed in your pics that the radiator foam is missing. Might try put that back in. It helps direct air flow over radiator.
     
  14. Aug 24, 2020 at 12:25 PM
    #74
    busterg

    busterg New Member

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    wow! good eye on the foam under radiator. I replaced the radiator with a drop in, koyo rad ordered from Advance auto, noticed the original rad had no foam or anything to redirect the air, and forgot to replace it with the new rad. I will see if i can buy that foam and get that back in there, definitely can help.
    thx
     
  15. Aug 24, 2020 at 5:55 PM
    #75
    zeekevin

    zeekevin New Member

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    I thought about the foam before when I replaced the radiator the first time, but I highly doubt it will solve the overheating issue
     
  16. Aug 24, 2020 at 7:38 PM
    #76
    busterg

    busterg New Member

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    The foam helps a little. I put some below and top. The true testis tomorrow, will be 108 tomorrow. I tested it w/ foam tonight with slightly better results. when I accelerate and rpm goes to 5k rpm temp dropped from 201 to 186 for a second then climbed back up. I have a flow issue, could be thermostat waiting for oem to arrive @ dealership. water pump that i just replaced aisin on Amazon. or water pump belt could be slipping, maybe tensioner pulley.

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  17. Aug 24, 2020 at 7:46 PM
    #77
    endagon

    endagon New Member

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    Kinda sounds like the fan clutch has something wrong with it and isn't grabbing quite so hard so the fan isn't kicking up as much as normal. It just works off of sticky fluid inside with a valve and a sensing thingy.

    When I was playing around with less grill opening in the cold of winter I was very surprised that it has no effect on coolant temp at all, be it small partial blocks or a full block. It actually reduced winter mileage because as soon as the coolant would get to 198-200 the fan would ROAR like a Kenworth and the temp would shoot down again. It was best to let it run open grill with coolant at 190-194 where it seems to want to stay. The clutch thermostat is sensitive to small increases in temp coming out of the radiator when working properly.
     
  18. Aug 24, 2020 at 8:01 PM
    #78
    busterg

    busterg New Member

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    I don't hear a roar at all, or the fan at all for that matter when the temp rises. If driving 75mph and temp hits 201 should I hear a roar from the fan at those speeds? Fan clutch is on its way from the dealer, I will replace that and the oem thermostat. I have tried to spin the fan while engine was cold, fan blades move a few inches, doesn't fully rotate around but does move some. Thanks.
     
  19. Aug 25, 2020 at 6:26 AM
    #79
    blanchard7684

    blanchard7684 New Member

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    Busterg, just noticed you've got 235K miles...change that fan clutch. Cheap insurance...
     
  20. Aug 25, 2020 at 6:49 PM
    #80
    busterg

    busterg New Member

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    Yup, I ordered the fan clutch Saturday w/ oem thermostat from toyota dealership here in Tucson. Just got the parts today but won't have time till Saturday to install them, I will provide some testing data after the install.
     
  21. Aug 26, 2020 at 7:06 AM
    #81
    blanchard7684

    blanchard7684 New Member

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    looking forward...this is a strange issue.
     
  22. Aug 26, 2020 at 9:40 AM
    #82
    zeekevin

    zeekevin New Member

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    Bleeding it again, this time I’m squeezing the heater hose and that’s where I’m getting a lot of air bubbles.

    So I’ll keep going till I don’t see anymore bubbles and report back

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  23. Aug 26, 2020 at 11:52 AM
    #83
    zeekevin

    zeekevin New Member

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    Well I got more air bubbles out, but still runs hot. I need to keep trying to burp it
     
  24. Aug 26, 2020 at 12:00 PM
    #84
    busterg

    busterg New Member

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    I got the Aisin water pump from Amazon, is that where you got your water pump?
     
  25. Aug 26, 2020 at 12:05 PM
    #85
    zeekevin

    zeekevin New Member

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    Rock auto
     
  26. Aug 27, 2020 at 7:07 AM
    #86
    blanchard7684

    blanchard7684 New Member

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    @zeekevin, @busterg

    Once common theme here is you guys are fairly high mileage. And you are both not massively overheating...you need a nudge to get things back to a 205F max temp.

    When replacing thermostat, are you replacing the element only? I was thinking that perhaps the housing is warped or defective in some way and preventing full operation of thermostat.

    Also... do you guys have new belt tensioners?

    And also x2...did either of you try replacing temp sensor? Or put another way, have you verified with temp gun temps are actually in the 215-220 range?

    @zeekevin I would try replacing the radiator foam and see if that at least brings temps down a few degrees.
     
  27. Aug 27, 2020 at 10:47 AM
    #87
    zeekevin

    zeekevin New Member

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    I’ll do that foam reinstall.

    interesting thing I notice, if I keep the truck in a lower gear and keep the rpms at or around 3k the temps are sit around 205°f
     
  28. Aug 27, 2020 at 4:39 PM
    #88
    Sumo91

    Sumo91 Busy with projects

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    Drive down the bumpiest road/trail you can, maybe that'll get some of the bubbles out, if you have any in the system, steep hills are a good idea too. Backflushing the entire system wouldn't be a bad idea either. I've done it to lots of vehicles with good results getting out alot of gunk. Flush from the top hose down (thermostat removed) and back flush the heater core too, and any other little hoses you can find. I've always used a water hose, but after it was back flushed I'd fill up with distilled water and run it, drain it, fill up with distilled water again, and repeat several times, usually happy with it around 20-25 gallons to get the tap water out, depending on the coolant capacity. Hope this can help in some way.
     
  29. Aug 29, 2020 at 3:11 PM
    #89
    busterg

    busterg New Member

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    Okay, update. I swapped out the thermostat w/ OEM part from toyota, also installed fan clutch from toyota dealership, drained the coolant and found some gunk from bottom hose. Used filtered funnel to add coolant with just a bit of distilled water and my test results are better.
    I now Idle hot at 195.8 and will hold temp w/ AC cranked on vs old temp @ 205. my highway speed temp going 75mph with vary from 194 to 197 my temp now moves around. low speed from 40 to 50mph i have seen 199 and hold, but when i drive down another road going 40 or 50 the temp will fall to 195 even 194. I drove around for 2hours with end results much better than previous temps but a hair higher I think but acceptable, highway speed is better, idle is better, and small mountain climb test temp saw 201 at 30mph.
    you will notice the toyota oem thermostat is much beefier than the generic thermostat from advance auto. also my radiator I noticed some small dents so I tried to unbend them with a pick, also noticed some black particle gunk from coolant, and the cheaper thermostat doesnt open at advertised temp of 180 but around 200 it seemed to open.IMG_7939.jpg IMG_7951.jpg IMG_7936.jpg IMG_7944.jpg IMG_7903.jpg IMG_7960.jpg IMG_7935.jpg IMG_7913.jpg IMG_7949.jpg IMG_7950.jpg IMG_7927.jpg IMG_7916.jpg IMG_7942.jpg IMG_7957.jpg IMG_7904.jpg IMG_7902.jpg IMG_7943.jpg IMG_7946.jpg IMG_7907.jpg IMG_7956.jpg IMG_7917.jpg
     
  30. Aug 29, 2020 at 5:49 PM
    #90
    zeekevin

    zeekevin New Member

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    So I talked to a couple of my Toyota tech buddies, and we went over the system again, I will be pulling out my t stat again to check it or just replace it one more time.
     

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