1993 Toyota PU running hot?

New to the forum and thanks for the add! I have a 1993 Toyota SR5 Ext. cab 4x4 3.0 V6 the truck is in excellent shape and been well maintained. The truck is running on the high side of hot but not over heating. The engine has 102,000 miles and runs good. I have replaced the radiator, burped the system, radiator cap, thermostat, water pump, timing belt, temp control switch, flushed the system, replaced injectors, no check engine lights, passed compression test, and passed head gasket combustion test, no antifreeze in oil, no white smoke, checked timing, new plugs and wires, new hoses, new belts, check temp guage for accuracy, new fuel filter, new air filter, put on computer and all good, fan and clutch good. With all that said of what i have replaced and tested the truck is still running on the high side of the temp guage and I am out of ideas of what I am missing. Any ideas of why still running warm? Thank you in advance.

 

The 3.0l v6 was notorious for blowing head gaskets, I believe there were recalls on them back in the day because it got so bad. But given that your coolant and oil looks good, it's probably not the issue. Just something to be aware of.

How's your fan clutch? If the fan isn't working properly the motor will start to overheat, not too bad if the fan is still somewhat functioning but enough to cause a problem.

edit: just saw you said the fan clutch was good.....well I'm stumped. Hopefully someone else can chime in

 

Yea, the fan and clutch are good. The truck passed the combustion head gasket test and compression test.

 

Maybe the new thermostat was installed upside down? I've heard of it happening on Tacomas and it will cause overheating. Has to point a certain direction and if it's going the other way, it was create a problem

 

I'll check and let you know. thank you

 

Update::
Started back tracking and checking everything and located little particles in thermostat housing. I just replaced radiator so I took a closer look at the radiator and discovered the previous owners had used some type of stop leak in the system and it was caked full of it. I used a tempature gun and found the temps at different parts of the motor and new radiator were alot different. Realizing the fluids wasnt circulating good, I took the truck and had a total system cleaning and flushing done by a trusted mechanic shop. Alot of the set up piecies and particles broke loose. I drove it for few hours with cleaner in the system and flushed and cleaned again. Big difference and temps are now staying down and temps are more equal throughout the system. I am going to flush and clean system one more time next week to make sure I got it all out. Thanks for all the ideas.

 

Nice! good to hear you got it figured out

 

I replaced my radiator with an aftermarket non OEM radiator and noticed the truck ran hotter, took it back and paid for an OEM Radiator and it runs cooler and correctly on the temp guage

 

Thank you for the follow up. Too many never come back with final results.

You have a low miler for a 93!

You might consider an aux temp gauge. Most OE gauges are range specific, and by the time it reads hot its too hot. Scan gauge 2 is how I solve this, but being pre OBDII you need another option