Stuck in Rolla with overheating issue.

Truck: 94 4Runner 5sp 4wd 3VZE R150F series
Radiator and hoses replaced less than 10k miles ago.

Overflow reservoir at semi cool


Radiator at semi cool


No milk in the oil cap

Aloha YT, noticed heat coming through the armrest from tranny today and decided to drain/fill the transmission. Followed the FSM. Drained about 5quarts and it took 6.5quarts to fill. Twice the spec of 3.2 quarts which is confusing. No leaks from my work and shifting ismuch smoother. Heat still coming up from transmission and at about 60 miles on the hwy my instrument panel temp guage started moving to redline every time id climb a a hill in 5th at about 3k rpms. Reading everything i can on the forums. Please help and thank you in advance.

 

Your better off keeping this all in your first thread. You had some solid people helping in that one. No need to make them find a new one.

 

Temp guage image, also there is no steam/smoke coming from under hood at high temp

 

Very muddy coolant.

Doesn't look like your coolant overflow has a dip tube that would permit hot coolant that was expelled to be sucked back into the radiator on cooling.

Good, repeated flushing, new correct thermostat, and refill with 50-50 glycol coolant and distilled water.

You won't know anything til you've tried these things.

Doesn't look like there's any coolant in the oil. That's a good sign.

Important to make the coolant overflow able to suck expelled coolant back into the radiator.

 

Im in Rolla and have tools. No yota dealership within 30 miles, can i get everything i need at autozone? I dont think they carry red yota coolant, which to use as temp instead? I can go first thing in the morning. Are there forum posts on how to do the flush and i assume replace overflow reservoir?

 

Regular green prestone type coolant OK after good flushing. Distilled water important but tap Ok for the flushings

Only necessary for there to be a sound hose connecting rad overflow and extending deep into the coolant reservoir so that suction might occur on engine cooling.

Clean out overflow reservoir, naturally.

 

Millball makes a good point, replace the reservoir cap dip tube "straw" if the original one is missing.
Have you done a proper bleed of the cooling system? With the heater on full in the cabin, are you getting hot temps through the vents or just ambient temperature? An air pocket could cause the overheat conditions described.

 

Combination: old coolant, stuck thermostat, broken thermostat gasket, and massive air pocket. Had it flushed, thermostat replaced, added the coolant reservoir straw, and filled. Had to go green, no place to get toyota red nearby; will do that next week. Big mahalo to you guys for your help!! 🤙🤙🤙

 

Awesome news... don't sweat the Toyota Specific coolant, not needed. Any good universal coolant will work great. I just shipped my old 94 to Maui and had a lot of these same issues while I was doing the rebuild. Nick Z.

 

Good deal! Keep on driving.

 

Mahaloz 🤙

 

Mahaloz 🤙