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Thread: Temperature Gauge at 3/4

  1. #21
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    Re: Temperature Gauge at 3/4

    Hey Hugh,

    Sorry, this may be asking the obvious - but are you losing any coolant at all? I had a very similar issue I ended up tracing back to the water pump. I noticed you made that change already with an OEM so that's great! I did the same thing, and then had the same problem! Turns out I didn't tighten those bolts down enough and there was still a small leak. Maybe an issue with that gasket too and the gasket sealer goop. What ends up happening is not only do you lose coolant, you can pull air into the system which is the best insulator and can increase engine temp.

    Shameless plug of that thread where I explained my repairs/thoughts: http://www.toyotavantech.com/forum/s...ll=1#post31339

    Sounds like you've been diligent about checking and double checking common issues, so you should be getting close!

    Just thought I'd throw my 2˘ in - hope you get to the bottom of this!

  2. #22
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    Re: Temperature Gauge at 3/4

    Quote Originally Posted by boogieman View Post
    i think making sure its hitting maxium advance might be an important test..how does the new engine feel compared to before the rebuild? a retarded engine will run hot... not having enough time to burn the charge, it transfers it to exhaust valves, manifold, and head..
    Thank you for the input Boogieman. I did verify that my engine is advancing 12 additional degrees with the advance (great input from Tim, verifying the advance is 20 degrees when advancing), so we can check that box!

    Honestly the only time I've run the engine is after the rebuild...the previous engine had a blown head and I was only able to get it to run for 5 seconds...so much better!

    Thanks again for the help!

  3. #23
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    Re: Temperature Gauge at 3/4

    Quote Originally Posted by swamptony View Post
    Hey Hugh,

    Sorry, this may be asking the obvious - but are you losing any coolant at all? I had a very similar issue I ended up tracing back to the water pump. I noticed you made that change already with an OEM so that's great! I did the same thing, and then had the same problem! Turns out I didn't tighten those bolts down enough and there was still a small leak. Maybe an issue with that gasket too and the gasket sealer goop. What ends up happening is not only do you lose coolant, you can pull air into the system which is the best insulator and can increase engine temp.

    Shameless plug of that thread where I explained my repairs/thoughts: http://www.toyotavantech.com/forum/s...ll=1#post31339

    Sounds like you've been diligent about checking and double checking common issues, so you should be getting close!

    Just thought I'd throw my 2˘ in - hope you get to the bottom of this!
    Great input, thanks so much Swamptony.

    I was previously loosing coolant and had the shop down the street perform a pressure test. It turns out my radiator had a small leak and a full rebuild fixed this issue up.

    So far, no more coolant loss!

    I just replaced the fan clutch last night so I'm hoping tomorrow I can get it out on the road to test it out.

    -Hugh

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    Re: Temperature Gauge at 3/4

    Quote Originally Posted by timsrv View Post

    I would also be concerned if I saw my temp gauge that high, but you need to verify coolant temp at the fill port (be careful as it can be dangerous removing the cap when hot). If the gauge is accurate, I would expect to see it ~220. If it shows to be normal (180 - 195), then I'd make a mental note this gauge location is normal for your van. Better yet, put a more accurate modern temp gauge in so you don't need to wonder.
    Alright Tim and Toyota Van Tech nation, I have another update.

    I replaced the fan clutch with an ASIN clutch and I am no longer creeping up to red. I am however, still rising up to 3/4 .

    I have an infrared thermometer and I checked the temp on the coolant fill port (driver side middle of the fill port), and it was around 190-200, even when the gauge was at 3/4. I'm thinking this is ok, and maybe just showing that my gauge is reading high? It turns out my head was reading 212, and not the coolant fill port. Any thoughts?

    At this point I have replaced the following items, and don't know what else to do other than just get a modern temp gauge to ease my worried mind.

    Progress so far:
    • Rebuilt radiator
    • OEM water pump
    • OEM thermostat, correctly installed with jiggle at 11'
    • OEM radiator cap
    • OEM upper & lower coolant hoses
    • Aftermarket temperature sending unit (well, maybe I should get OEM here too...)
    • Timing verified correct
    • Timing advance verified correct
    • Coolant burped


    That's it for now, thank you all so much for your help to this point!

    -Hugh

  5. #25
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    Re: Temperature Gauge at 3/4

    It sounds like you're making progress, so that's good. Personally, I wouldn't waste any more time on this before 1st verifying there is a problem, and knowing true coolant temp at the fill port is the #1 thing you should focus on.

    I'm sure infrared thermometers are awesome, but frankly I've never used one so I'd be a little skittish about trusting one. There's also the possibility of it reading correctly, but perhaps reading other heat passing by from other areas (like exhaust manifold). For that reason I'd want a submerged temp probe (so you know you're reading actual coolant temperature). Digital meat thermometers are cheap, accurate, and fall within the range we're after, so I'd get the van to temp, then (carefully) remove the radiator cap and stick the probe down into the coolant.

    Better yet, since you've invested so much in your van, wouldn't you feel better knowing at a glance what the temp is at any given moment? There's lots of nice accurate temp gauges to choose from, but I personally like Koso because they're reasonably priced, accurate, and easy to read:

    here's a picture of one installed in my 86 van (blue digits saying 90 deg)



    Here's a post that gives more info on it and where to buy: http://www.toyotavantech.com/forum/s...6143#post16143

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    Re: Temperature Gauge at 3/4

    Quote Originally Posted by timsrv View Post
    It sounds like you're making progress, so that's good. Personally, I wouldn't waste any more time on this before 1st verifying there is a problem, and knowing true coolant temp at the fill port is the #1 thing you should focus on.

    I'm sure infrared thermometers are awesome, but frankly I've never used one so I'd be a little skittish about trusting one. There's also the possibility of it reading correctly, but perhaps reading other heat passing by from other areas (like exhaust manifold). For that reason I'd want a submerged temp probe (so you know you're reading actual coolant temperature). Digital meat thermometers are cheap, accurate, and fall within the range we're after, so I'd get the van to temp, then (carefully) remove the radiator cap and stick the probe down into the coolant.

    Better yet, since you've invested so much in your van, wouldn't you feel better knowing at a glance what the temp is at any given moment? There's lots of nice accurate temp gauges to choose from, but I personally like Koso because they're reasonably priced, accurate, and easy to read:

    here's a picture of one installed in my 86 van (blue digits saying 90 deg)



    Here's a post that gives more info on it and where to buy: http://www.toyotavantech.com/forum/s...6143#post16143
    Thank you very much Tim! This is so helpful, I really appreciate all the hard work you put into making this post.

    I just placed aces an order for the Koso gauge and adapter, so I should have some updates in the coming week!

    Thanks again,
    Hugh

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    Re: Temperature Gauge at 3/4

    Quote Originally Posted by timsrv View Post
    I'm sure infrared thermometers are awesome, but frankly I've never used one so I'd be a little skittish about trusting one. There's also the possibility of it reading correctly, but perhaps reading other heat passing by from other areas (like exhaust manifold). For that reason I'd want a submerged temp probe (so you know you're reading actual coolant temperature). Digital meat thermometers are cheap, accurate, and fall within the range we're after, so I'd get the van to temp, then (carefully) remove the radiator cap and stick the probe down into the coolant.

    Better yet, since you've invested so much in your van, wouldn't you feel better knowing at a glance what the temp is at any given moment? There's lots of nice accurate temp gauges to choose from, but I personally like Koso because they're reasonably priced, accurate, and easy to read:
    Alright everyone, the mystery has been SOLVED!

    I followed Tim's advice and installed a KOSO temp gauge and found out my van is running 175 - 190! Even after installing an OEM temperature sending unit, my gauge is way off. Looks like I'll be relying on the new gauge instead of my stock gauge.

    I can also rest assured that I now have an all new cooling system . Looks like I'm ready to head to Key West in April for the first major trip.

    Thank you all again for the generous help.

    -Hugh

  8. #28
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    Re: Temperature Gauge at 3/4

    That's awesome

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    Re: Temperature Gauge at 3/4

    Quick temp question - I've installed the Koso gauge and all is good while the van is running. But after shutting it off and coming back to it 15 minutes later, I now know how hot it can get AFTER the coolant stops flowing and the engine is off. I've seen it up to 217* before plateauing and very slowly dropping.

    Once the engine is back on, it does drop quickly, but is this high temp while off something to be concerned with?

    One side effect of this gauge is that I now seem to be hyper aware of my temp at all times!

  10. #30
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    Re: Temperature Gauge at 3/4

    This is normal, the only difference being you are now aware. Higher temps while running can create issues due to the dissimilar rate metals expand/contract. When the engine is at rest temperatures are far less critical as there are no moving parts. When started temps quickly drop, so not really an issue there either.

    I like this gauge for the same reasons you point out. Always good to be aware of engine temp as overheating is the leading cause of blown head gaskets (not fun). Tim

  11. #31
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    Re: Temperature Gauge at 3/4

    Quote Originally Posted by Gambit View Post
    Quick temp question - I've installed the Koso gauge and all is good while the van is running. But after shutting it off and coming back to it 15 minutes later, I now know how hot it can get AFTER the coolant stops flowing and the engine is off. I've seen it up to 217* before plateauing and very slowly dropping.
    An easy way to mitigate the "heat bubble" effect is to roll down your front windows and prop open your driver's seat/engine bay lid. I've been doing this for years now, even after all the work on my cooling system has been
    completed.
    "You came in that thing?... You're braver than I thought!" - Princess Leia

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    Re: Temperature Gauge at 3/4

    Great - thanks all! This site is a fantastic resource

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