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#286 of 460 1994 Toyota Pickup Overheating?? or Bad Gauge/Sensor?
Feb 20, 2007 (2:00 pm)
Recently purchased a used 1994 Toyota. Dealership (not a Toyota certified dealer) said they had just replaced the water pump. Pump looked like it had been replaced.
Two weeks later, while driving I notice that my temp guage is nearly in the red, but within seconds it jumps back down to normal operating temp (needle half way on the gauge). Since then, it has been happening regularly: After I start the truck and run it for 5 minutes (or long enough to get the gauge up to half way), the needle starts going towards the red while I'm driving. It'll just barely hit the red and stay there for maybe 20 seconds at the most before it jumps immediately back down to half way. It will do this 2 or 3 times over the next 10-15 minutes. After that, if I continue to drive, it will stop doing this. If I stop for an hour and then drive the cycle will start over....it only stops if you drive for long periods (20+ minutes) of time.
I have replaced the thermostat (right side up) and still have the problem. I'm getting plenty of heat. Engine fan seems to work fine. No leaks or strange smells. The cooland res is filled to the correct level. & like I said, the dealer has replaced the water pump.
So, is it possibly the temp guage sensor? I'm thinking of replacing that.
What should I try next?
Is it possible there is an air bubble trapped somewhere?
I'm running out of ideas.
Any comments greatly appreciated.
Thanks in advance!
#287 of 460 Re: 1994 Toyota Pickup Overheating?? or Bad Gauge/Sensor? [h20proof]
Feb 20, 2007 (4:40 pm)
try checking your radiator. i had an overheating prob. and i have a 94 also
#288 of 460 93 Toyota Pickup Overheating
Feb 22, 2007 (7:12 am)
My 93 Toyota pickup (150,000 miles)overheated for the first time this week. Very little has been done to the truck other than routine maintenance - its been a great/reliable and problem free vehicle. What is happening is the temp gage moves to mid range within 5 mins, by about 15 minutes it is redlined. It doesn't get better with idling, it stays high until the engine is shut off/cooled down. I have plenty of heat inside the vehicle as well. Luckily it is cold outside with winter here; so I can at least get to work and back before without major issues. I have no other "symptoms" - everything else is running fine. The day before the overheating started, I was stuck badly in about 2+ feet of snow; took 30 minutes and about 8 men to get unstuck. No "pools" of antifreeze on the ground are evident, and I don't see any spraying from hoses when I pop the hood. But I am obiously losing coolant with the overheating. I top off the system before I drive back & forth to work. I plan to replace hoses, thermostat this weekend, if that doesn't work - then I will look at the radiator next. If anyone has any sure fire thoughts that would help expedite my troubleshooting - please let me know. Thank you!
#289 of 460 Re: 93 Toyota Pickup Overheating [cshirk3]
Feb 22, 2007 (7:25 am)
If you are loosing anti-freeze without obvious signs of leaking it, and it's overheating, I would make sure to check the under side of the oil cap. If the under side of the oil cap looks like chocolate milk (creamy brownish oil) then it may be leaking through the head gasket into the oil, or you may have a cracked head.
It very well could be the thermostat, though. If it only takes a few minutes to redline it in cold weather, then the thermostat could be stuck closed, and you're losing coolant through the overflow bottle. When it overheats, and you shut it off to cool down, do you hear a rattling\bubbling sound? Kind of like water boiling inside the overflow bottle? That might be it.
#291 of 460 Re: 93 Toyota Pickup Overheating [pauliep13]
Feb 22, 2007 (7:51 am)
Thank you! I do see coolant clinging to the truck carriage parts under the overflow reservoir and radiator (on the drivers side only), and the bottom radiator hose has coolant on/under it. The center part of the truck and passenger side below the radiator appear dry, as well as the top radiator hose is dry. Yes, I hear the "gurgling", but it seems to be coming from the radiator, as by the time I hear it and can check it, the reservoir is empty.
#292 of 460 Re: 93 Toyota Pickup Overheating [cshirk3]
Feb 22, 2007 (9:04 am)
Well, as long as the under sie of the oil cap looks normal (dark brown/black oil) then I'd have to venture that it's your thermostat stuck closed. It may cost a few more dollars, but I'd recomend getting one from the dealership. It will be the proper temp, and they will have the proper fitting rubber seal. Make sure to get a new seal with it! I can't speak for the V6, but on my 22re you don't use any silicone on the rubber seal, just clean the surfaces thoroughly, then get a new seal, and tighten the housing bolts properly. Also, make sure to note what side of the thermostat is facing "up" when you take the housing off, and reinstall the new one in the same direction.
#293 of 460 Re: Turn Signal Blues [rick69]
Feb 23, 2007 (2:50 am)
My 93 S w/d toy had same issue turn out was a short in turn signal lamp in left front bumper...good luck
#294 of 460 I need help with front clip
Feb 23, 2007 (2:53 am)
93 2 W/d has suffered greatly over the years so inner fenders and middle cross beam are bent up and no longer viable. Anyone know is the whole front clip welded on? a bolt on job or combination? I have replaced fenders n hood with no isue it is the underlying structure i desperately need help with as i have minimum tools and skills . Any ideas or anyone with parts? thanks
#295 of 460 85 Toyota Pickup Tail Lights Stay On
Feb 27, 2007 (5:46 pm)
Hey Everybody -
Need some help. Noticed today that the brake lights stayed on even after turning off lights and ignition. I figure it might be the tail light relay, but I can't find out where it is (checked Haynes). I had to pull the neg terminal on the battery to turn off. Any ideas and/or can anyone provide location of the relay? I've searched the internet with no luck. Thanks!