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Strange overheating problem
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luckyhuntr
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May 27, 2010, 1:04 PM
Post #1 of 12
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Strange overheating problem
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I have 1991 lexus es250, New radiator, new thermostat 180, new manuel Temp guage, it heats up to 195 both electric fans come on for 25 seconds and go off for 25 seconds, but heat is still 195, can anyone help???
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Hammer Time
Ultimate Carjunky
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May 27, 2010, 1:55 PM
Post #2 of 12
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Re: Strange overheating problem
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There is a water temp switch for the fan inb the right front of the engine. It is a 2 speed system and it sounds like low speed is not working, likely due to a bad switch
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luckyhuntr
Novice
May 27, 2010, 3:18 PM
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Re: Strange overheating problem
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where exactly can I find this switch and what does it look like and this sounds good thank you
(This post was edited by luckyhuntr on May 27, 2010, 3:20 PM)
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Hammer Time
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May 27, 2010, 3:36 PM
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Re: Strange overheating problem
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I don't have too much detail except it's on the front of the engine behind the right headlamp. It will have 2 wires, one white and one yellow.
There are also 3 relays and a control module in the fan circuit so it may not be that.
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luckyhuntr
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May 27, 2010, 6:46 PM
Post #5 of 12
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Re: Strange overheating problem
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This makes since both fans come on for 25 seconds and off for 25 seconds over and over they seem to be only running at one speed and the temp stays at 195 degrees and I can take off the radiator cap at this temp there isnt much pressure but there is a little.
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Hammer Time
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May 27, 2010, 6:51 PM
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Re: Strange overheating problem
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It can just as easily be a fuse or a problem with one of the 3 relays.
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luckyhuntr
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May 28, 2010, 7:37 PM
Post #7 of 12
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Re: Strange overheating problem
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 YEAH!!!! I fixed it, the 91 lexus is supposed to have a 195 thermostat, all parts houses their books say 180, and so that is what I put in it, but I called the lexus dealer and they said it takes a 195 thermostat dealer item only!!!! and it worked. THANKS FOR ALL OF THE IDEAS. I TRULY DO APPRECIATE THE HELP ANYWAY!
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Hammer Time
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May 29, 2010, 2:33 AM
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Re: Strange overheating problem
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I'm afraid that information is incorrect.
This is the temp info directly from the factory service manual
Thermostat Opening Temperature 176-183 F
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luckyhuntr
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May 29, 2010, 7:37 PM
Post #9 of 12
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Re: Strange overheating problem
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I put the 195 thermostat in and the car is working perfectly! Lexus dealer is the one who said it is 195 and they seem to be right I am having no more problems, I've been driving it up and down the hills where I live and the temp is staying 194-197 or so, but I am having no more overheating problems so I would say the factory service manuel is incorrect, I watched the parts person at the lexus dealer look it up on their computer and they gave me a 195 thermostat. it works great now so I would tend to take lexus dealers word for it!!!!!!!!!!!!!!!
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Hammer Time
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May 29, 2010, 7:52 PM
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Re: Strange overheating problem
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And just who do you think supplies the dealer with their info?
So, your saying everyone else was wrong except this one parts guy that works at a dealer? I assure you that changing from a 180 degree to a 195 degree didn't stop your car from overheating.
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luckyhuntr
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May 29, 2010, 9:29 PM
Post #11 of 12
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Re: Strange overheating problem
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I am sorry you seem to have a problem with this being the fix to my overheating problem, but take a chill pill and accept the facts. Brand new 180 and it still overheated, brand new 195 and no more overheating. And it was'nt just this one parts guy, another mechanic told me this, and that is why I called the lexus dealer to begin with, when they told me the same thing I tried it, and woomp there it is it worked!!!!!!!!!!!!!!!!!!!
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Hammer Time
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May 30, 2010, 4:08 AM
Post #12 of 12
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Re: Strange overheating problem
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Whatever floats your boat.............
The difference here may have been you finally getting all the air out of the system but is certainly wasn't because you put a hotter thermostat in it.
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