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Discussion Starter #1
1. What temperature for the Thermostat does everyone have? I think I have 190 degrees.
2. What psi for the Radiator cap does everyone have?I think I have the one somewhere 13 psi.

Q' I ask these question because I'm having problems with temp. gauge. It gets to mid level after driving for a while and fluctuates near redline when driving for a while at 50+mph with A/C cooler on. I'm thinking these might be the problem. I'm using Toyota Red coolant if that matters.
I hope a hose doesn't swell and leak at the heater hose (behind the engine) like it did a while back. The reason for that was the thermostat, which I changed then.
 

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If it overheats on the highway its most likely a plugged up radiator. The stock thermostat is a 192 degree, im using a 180, you can also get a 160. The radiator cap is 13psi.
 

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Discussion Starter #3
The problem is that the temp guage increases significantly only when I turn on the A/C and driven it for a while.
Could the cooling system be the reason?
 

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Radiators are cheap, I suggest a reverse flush, 180deg thermostat, new radiator, and new rad cap. That will solve every single one of your cooling problems unless your water pump has problems, and it should all cost lest than $150 if you DIY, which everyone should be able to do.

--BillyM
 

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would a cooler thermostat really be beneficial in a more moderate climate, or is it just suited to warmer areas?
 

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i was doing a search and came across this. i was wondering would a cooler thermostat be beneficial?
 

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i was doing a search and came across this. i was wondering would a cooler thermostat be beneficial?
I think so, for a hot climate. I run 180 thermostats in my cars. The downside is the colder your engine runs the more the ECU will compensate and add more fuel.
 

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I'm running a Toyota OEM Tstat with the overheat pellet cut. Running a regular Stant OEM replacment Cap. 50/50 Prestone coolant. new fan clutch. Pulled the radiator and had a Radiator shop rod/flush it out. I like 190 tstats for milage. cooler ones won't keep your engine from overheating. Tstats regulate the COLDEST your engine can run.
 
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