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Old 09-23-2010, 11:52 AM #1
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I am stumped-Eng Temp issues

OK most of the time my Scan Gauage is reading in the 190 range but sometimes in traffic 204. What I have found searching is Normal operating range for our vehicles is 178 to 204. I don't like that I am in the upper end of range but get more concerned whenever I head to the Mountains to go wheeling. I turn OD off and still have the temps rise to the 220-227 range. Transmission doesnt feel like it is slipping and no RPM variance either. Steps I have taken already:
Coolant flush/refill, transmission fluid change. I had the TB water pump and T-stat changed at 189k and currently at 217k. Any suggestions?

My next possible things to do are Radiator, Cap, T-Stat(in case I got a bad one) hoses.
What else should I check for?
How likely is it to be Tranny related and not cooling system even though no signs of slipping?
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Old 09-23-2010, 12:05 PM #2
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What does the scan gauge say the tranny temp is when you go over 220? Have you done the tranny cooler bypass? That's one way to server the tie between the radiator and the tranny. But I really don't think the tranny has anything to do with it. It could be normal temps and a result of continuous load on the engine. How's the condition of the radiator? A new radiator may help. You may also consider an external oil cooler? Maybe try some slick50? I know that sounds kooky but it worked for me years back when I had a similar situation.
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Old 09-23-2010, 12:18 PM #3
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I have a 98 so no Tranny codes for the SG. Damn 99 and newer guys get all the cool stuff(cup holders, transmission temp codes..LOL). No tranny cooler bypass however that is something I am considering as well as new radiator. I just took a big pay cut a couple months back and no money to do anything.
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Old 09-23-2010, 01:20 PM #4
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I'm regularly seeing 204 in normal driving. Wasn't always that way...not sure what changed.

I'm going to try a new radiator (can't hurt, good preventive maintenance) when I do my coolant flush next. Along with new hoses, CTS, cap, and t-stat.

When you're temp climbs into the 220's...can you hear your engine fan running? It should be. Perhaps the fan clutch isn't operating properly.
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Old 09-23-2010, 01:25 PM #5
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I'm wondering 1) how accurate the scangauge engine temp sensor is or does it work off of the stock temp sensor, and 2) does your needle still stay just a little under 1/2? I forget if I asked you that when we were talking about it a few weeks ago. Hopefully you can make the JB run on 10/3 and we can have Driffter bring his handheld temp finder along and compare ours.
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Old 09-23-2010, 01:33 PM #6
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The Scan Guage reads it from the ECM so supposed to be same signal going to dash guage. Dash guage sits just under half a couple minutes after warming up and never goes any higher then middle. had fan clutch tested and it is fine. My radiator guy told me that what I describe sounds like a clogged or blocked coolant passage. Recommended I check T-stat, take radiator to him for inspection and cleaning, also check water pump. He asked me a few questions about temp under different driving conditions and based on that also said it does not sound like a fan clutch.

Brian on the trail it is fine and most driving fine, just under heavy load like the drive to the trail it gets hot. I can't afford it but going to order a Koyo A1998 radiator today. Especially since I am putting on a plate bumper that is going to block more of the air flow to the radiator soon.
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Old 09-23-2010, 01:46 PM #7
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Quote:
Originally Posted by Pikeman View Post
The Scan Guage reads it from the ECM so supposed to be same signal going to dash guage. Dash guage sits just under half a couple minutes after warming up and never goes any higher then middle. had fan clutch tested and it is fine. My radiator guy told me that what I describe sounds like a clogged or blocked coolant passage. Recommended I check T-stat, take radiator to him for inspection and cleaning, also check water pump. He asked me a few questions about temp under different driving conditions and based on that also said it does not sound like a fan clutch.

Brian on the trail it is fine and most driving fine, just under heavy load like the drive to the trail it gets hot. I can't afford it but going to order a Koyo A1998 radiator today. Especially since I am putting on a plate bumper that is going to block more of the air flow to the radiator soon.
Maybe if you go on 10/3 (which I know is iffy right now if you'll be able to get it off) you can see what your temps look like compared one of the other guy's right after driving up the mtn?
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Old 09-23-2010, 02:31 PM #8
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Hmmm. If it IS a blocked passage, how would you know where...and how would one fix it?
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Old 09-23-2010, 03:25 PM #9
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Quote:
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had fan clutch tested and it is fine.
How did you test the fan clutch? I also read the water temp on my CG in 204-206 range all the time driving on highway. I flushed the system and replaced the cap without any change. So, how to test the fan clutch? Thanks
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Old 09-23-2010, 04:33 PM #10
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Quote:
Originally Posted by alp View Post
I also read the water temp on my CG in 204-206 range all the time driving on highway. I flushed the system and replaced the cap without any change.
You may want to get a new thermostat. Maybe one that opens at a lower temp. I put a 180 degree in my old Pontiac. It could be that Toyota wants the temp to be at 205 for a reason. It might throw a code if it does not warm up to that. Still, I'd think 190 should be sufficient.
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Old 09-23-2010, 04:57 PM #11
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Factory T-stat is supposed to open at 185. IF you google test fan clutch it will tell you but IIRC you let it get up to temperature then shut engine off and try to rotate counter clockwise, you should feel resistance after 1st turn. If it spins freely then it is more than likely bad.
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Old 09-23-2010, 06:34 PM #12
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Quote:
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Factory T-stat is supposed to open at 185. IF you google test fan clutch it will tell you but IIRC you let it get up to temperature then shut engine off and try to rotate counter clockwise, you should feel resistance after 1st turn. If it spins freely then it is more than likely bad.
Thanks for advice! Will do the test tomorrow.
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Old 10-01-2010, 12:31 PM #13
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So I did the test. First I checked fan rotation before starting the engine.
I couldn't freely rotate the fun more than 1/4 turn. So far so good.
Then I started the engine and run it for about 5 minutes.
Stopped the engine and try to turn the fan counter clockwise. I could spin it
for many turns without ant resistance whatsoever. Same story when I turned it clockwise.
Does it all mean that it is time to change the fan clutch?
Can you guys performe this simple test on your trucks and let us know about results, please?
Thanks a lot!
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Old 10-01-2010, 03:45 PM #14
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I don't think that is an accurate test. Check it when the engine bay is hot like after driving home from work. There should be much resistance at that time.
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Old 10-01-2010, 03:46 PM #15
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Quote:
Originally Posted by alp View Post
So I did the test. First I checked fan rotation before starting the engine.
I couldn't freely rotate the fun more than 1/4 turn. So far so good.
Then I started the engine and run it for about 5 minutes.
Stopped the engine and try to turn the fan counter clockwise. I could spin it
for many turns without ant resistance whatsoever. Same story when I turned it clockwise.
Does it all mean that it is time to change the fan clutch?
Can you guys performe this simple test on your trucks and let us know about results, please?
Thanks a lot!
That's a pretty useless test, if I understand correctly how these things work. Stationary resistance is meaningless because it is a 'centrifugal' clutch and it has to be spinning for the fluid to reach the places where it causes the clutch to engage. I recently changed mine, and I had the old, bad one sitting next to its replacement in front of me. Both were identical in their resistance to turning (some, but not much). Many swear by the magazine test, but I believe that is somewhat hit or miss. The most dramatic difference on the replacement was the return of the roar of full engagement at start-up of a cold engine. If you don't have that, your clutch is dead.
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