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sr5 coolant gauge issue

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Old 10-18-2009 | 10:13 AM
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sr5 coolant gauge issue
did a search around and others that had similiar problems but no solutions. the temp gauge pegs out like 30 seconds after starting from dead cold but the truck isn't overheating. looks like some sort of common problem with sr5's?
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Old 10-18-2009 | 10:32 AM
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you try replacing your coolant temp sending unit/sensor?
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Old 10-19-2009 | 10:39 AM
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where would this be located? on top of the thermostat housing im assuming?
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Old 10-19-2009 | 11:17 PM
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you could possibly have a bad ground...
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Old 10-24-2009 | 08:02 AM
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Originally Posted by my-4x4
you could possibly have a bad ground...
hmm, is there a easy way to check this? go from the sending unit(at the thermostat) to the gauge? kinda new to electrical troubleshooting but understand the basics
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Old 10-24-2009 | 08:10 AM
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Search, theres a thread. You need to get a differnt type of thermostat that has a little hole in it to allow coolant thru all the time or something along hte lines of that.
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Old 10-24-2009 | 09:08 AM
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Originally Posted by Motomeister
did a search around and others that had similiar problems but no solutions. the temp gauge pegs out like 30 seconds after starting from dead cold but the truck isn't overheating. looks like some sort of common problem with sr5's?
Yep:
- http://www.4crawler.com/4x4/CheapTri...tml#Thermostat

TSB: 029032787 22R-E Engine Temperature Overshoot

It says:

Some 1984 pickup trucks and 1983-1984 Celica models, equipped with 22R-E engines, may experience a condition called "temperature gauge overshoot". After starting a cold engine the temperature gauge will indicate a higher than normal engine temperature for a short time just prior to the thermostat opening. After the thermostat opens, the temperature gauge will return to the normal range. A new double valve thermostat has been made available to reduce temperature gauge overshoot.

And calls for part number 90916-03070 which according to the TSB replaces 90916-03055.
Happened on my '85/SR-5 and the t-stat listed fixed it 100%.
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Old 10-24-2009 | 09:13 AM
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Originally Posted by 4Crawler
Yep:
- http://www.4crawler.com/4x4/CheapTri...tml#Thermostat



Happened on my '85/SR-5 and the t-stat listed fixed it 100%.
its not a problem of overshooting. it goes from dead cold to hot and doesn't fluctuate at all after that.
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Old 10-24-2009 | 09:17 AM
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It could also be the gauges.. since the sr5 gauges arent the best...
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Old 10-24-2009 | 09:17 AM
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Originally Posted by Motomeister
its not a problem of overshooting. it goes from dead cold to hot and doesn't fluctuate at all after that.
OK, then grab the Factory Service Manual, it has a page or two of testing the gauge and the sender.
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Old 10-24-2009 | 09:27 AM
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Originally Posted by 4Crawler
OK, then grab the Factory Service Manual, it has a page or two of testing the gauge and the sender.
wow, thanks man. never seemed to look into that section of the FSM... i think this will helm me tremendously. ill post up what i find.
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Old 10-26-2009 | 10:32 AM
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sending unit for the gauge is a single wire unit? it wouldn't shock me if you told me the wire going to this sensor was green??
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Old 11-18-2009 | 01:07 PM
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so my gauge does not ohm out properly. how do i go about replacing just the gauge?
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