help overheating issues

[12083127]

I have a 1993 toyota camry 4 cylinder and I was driving on the highway and then the cars temperature is rising to the hot zone and im not sure what the problem is. The coolant fluid is at max level and is not leaking any coolant anywhere.I just recently bought the vehice and its at 227,000 Kms and I am not sure if the old owner fixed the timing belt nor the water pump. I have pictures of this broken piece, this piece is right above the upper radiator hose. Please help if you know what the problem is thanks in advance

[Kep]

Did this happen all at once or has it been getting progressively hotter? Do you only notice the difference at highway speeds? How high on the gauge is the temp getting?

I am pretty sure that that is the VSV for the EGR system. Trace the vacuum tubes. One should go to the EGR Modulator. When operating correctly, the EGR is open at highway speeds and one of the results of an open EGR is to cool down the engine operating temperature.

I don't know how much this would affect the temp gauge though. The thermostat should allow the coolant to flow more and keep the engine within operating temp specs. Did you notice a dramatic increase on the temp gauge or just enough to be noticeable? Just a little - that VSV sensor might be a factor. A great deal - I lean more toward a problem with the cooling system (insufficient antifreeze in the coolant, a failing thermostat, a failing water pump, a failing radiator, etc..). I don't tend to think that it would be the fan(s) since this is happening at highway speed. I suspect that it's still pretty cool up in Vancouver. It could also be a failing temp gauge. Before doing something expensive you might want to plumb in a "mechanic's" temp gauge just to verify the correct operation of the dash gauge.

If there is enough of a nub on the broken nipple to slip a hose over you might be able to dip the hose (fish the broken piece out of the end) into hot water (this softens the rubber) and slip it over the remaining nub. Then get a small wire tie and use it like a miniature hose clamp. If you succeed in keeping it on the fitting you may (or may not) notice an effect on the temp. At minimum the car should run better. Otherwise, you can find these in a junk yard or eBay for a lot less than a new one.

Luck,
Kep

[frenum49]

Hello, Let your engine warm up and turn on the heat. If it is cold, replace your thermostat. Drain your radiator partially via the petcock which is near the bottom of the radiator. Be careful, petcocks often break or strip when too much force is used to loosen or tighten them. Once this is done just follow the lower radiator hose from the radiator to the engine block. There is an aluminum part that bolts to the block and mates to the lower hose. Remove the two bolts holding it. The thermostat is under there. The part should cost $10-$15 and takes about 15 minutes to replace. Do not over tighten the thermostat housing bolts as this aluminum part can easily break. You will likely need a new thermostat housing gasket or you could use RTV sealant. I like the high-temp stuff. Be sure to note the orientation of the stock thermostat so that you put the new one in properly.

[Kevin89AllTrac]

Both my Corolla and Toyota motorhome started overheating on the highway but were fine around town. I fixed both of them by buying a Prestone reverse flush kit for $5 or so and a bottle of radiator flush stuff. Followed the directions on the flush kit and problem solved. This removed rust and scale from the radiator, hoses, and heater core. A thorough job would involve removing the thermostat, reinstalling the thermosat housing, and flushing per the instructions. Then put your new thermostat in and fill with coolant and water.

[12083127]

thanks for all the replys everyone. it only happen once on the highway , the gauge it was almost at close to hot. but i will try changing the thermostat first and then see what happens