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Old 08-02-2007, 12:37 AM   #1 (permalink)
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Operating Temp for 22RE ???

I have '93 4x4 22RE 5speed with 134xxx miles. I bought the truck with 129,000 miles and did a mix of city-highway driving in AZ, sometimes in 100 degree temps, and the temperature gauge (factory in dash) never went over the 1/3 mark...
Prior to driving up to WA for vacation I was gonna flush the radiator and noticed it had some serious corrosion and decided to have my mechanic switch it out with a new one. Driving through AZ/Cali with the AC on/climbing hills the gauge pushed way up...never in the red, but sometimes to the 2/3 mark. Now when I climb hills it does the same thing...even in 80-90 degree weather up here in WA. When driving around town the gauge reads normal.

Is this normal? Coolant is new (the pink stuff?) and it is at appropriate level.
Thanks guys...
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Old 08-02-2007, 09:35 AM   #2 (permalink)
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I kind of have the same problem, when my truck is at its hotest my guage reads about 1/3 though. I looked at the valve for the coolent and it was fine, I also changed the temperature sender (single wire one) that goes to the gauge and nothing changed. I think it is just the guage not reading correct.
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Old 08-02-2007, 09:39 AM   #3 (permalink)
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It is normal, when you climb the hills with the A/C on in that kind of heat, the engine is working really hard, so it is going to see higher operating temperatures.
I saw the same thing last summer when I was in the Black Hills and it was 90+ andI was driving through the mountains there. The needle went high but never in the red.

How is your thermostat? and
Have you had you coolant tested lately?
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Old 08-02-2007, 10:43 AM   #4 (permalink)
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I would change out the thermostat--
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Old 08-02-2007, 01:07 PM   #5 (permalink)
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I had a similar problem, and change out the thermostat with a Toyota one. Apparently, they redesigned the thermostat or something. It worked a lot better in my truck.
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Old 08-02-2007, 06:57 PM   #6 (permalink)
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Thanks...thermostat was my first guess. Coolant should be golden...it and the radiator have only a few thousand miles on them.

I've changed the thermstat on Ford 302's a few times. How easy is it in a 22RE?
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Old 08-02-2007, 07:12 PM   #7 (permalink)
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It is relatively easy, I did it on Tuesday night and with a coolant change it took me about an hour and I was taking my time
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Old 08-02-2007, 07:44 PM   #8 (permalink)
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Are you talking about the toyota two stage thermostat? I was told to get one for my truck as well. Does anyone have the part number?
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Old 08-02-2007, 08:43 PM   #9 (permalink)
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What you are describing is not normal.

If the radiator has been changed, the first thing to do would be make sure the cooling system is all the way full. The pressure cap should have been replaced with the radiator. next replace the thermostat.
It's not really hard, just sometimes on older vehicles like these you can have problems getting the bolts out without breaking them.

If the t-stat doesn't help you should check for combustion gasses (CO2) in the cooling system. This would indicate a leaking head gsk.
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Old 08-03-2007, 09:04 AM   #10 (permalink)
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Quote:
Originally Posted by koreshywarrior
Thanks...thermostat was my first guess. Coolant should be golden...it and the radiator have only a few thousand miles on them.

I've changed the thermstat on Ford 302's a few times. How easy is it in a 22RE?

If you can remove 2 bolts with a socket, you shouldn't have a problem with it.
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Old 08-03-2007, 04:50 PM   #11 (permalink)
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Quote:
Originally Posted by Setheroo
Are you talking about the toyota two stage thermostat? I was told to get one for my truck as well. Does anyone have the part number?

90916-03070
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Old 09-23-2007, 08:38 AM   #12 (permalink)
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180 degree Stant stat # 29868 (52mm)stat gasket Felpro # 35278
2 State/stage 190 degree T-stat Toyotapart # 90916-03070=$28.80 CDN
1 State/stage 190 degree T-stat Toyota part # 90916-03078=$12.90 CDN (in stock)

180 degree stat (82 degree Celcius) Toyota # 90916-03083 (75-80 20R,85-87 22RT-E)
Stat gasket Toyota # 16341-35010=$2.70 CDN & # 16341-38021 (1982 or earlier)

For complete info on replacing thermostat including drilling a tiny hole on existing one:

http://www.4crawler.com/4x4/CheapTri...tml#Thermostat

Make sure you use 50% Toyota long life red low silicates radiator coolant to reduce corrosion build up on the tiny water bypass passages found in the aluminum cylinder head and preferably 50% distilled water,rain water or snow water.

I would pour the mixed coolant & water combination into the thermostat hole until full then install new stat and stat cover/hose tighten up.Start the truck on an incline or car ramps and start pouring mixed coolant & water combo into radiatior almost to the neck wait for stat to open which is about 10 minutes of idling then turn your heater on to high and hot (as well as your back seat heater controls for those with 4-Runners) and rev the engine back and forth but not too high.Re-top the coolant and continue to do so for one or more stat cycles.

Finally turn the heater control from hot to cold repeatedly and from high to low and place about half mixed coolant & water into overflow bottle and place stat cap back on,take for a test drive.Once engine has cooled off check the rad level and overflow bottle.

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