Question about 1997 Chevrolet Suburban

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Heating up dash gauge reads "hot" -- i replaced coolant.. got no leaks that i can see -- thinkin' themostat stickin' ? how do i change it? also -- after 10 mins of driving, area under steering column feels like heater is on HIGH, even tho its off .. why?

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Not sure why on the steering column. On the thermostat, the top hose from radiator to motor, about 2 inches thick. Follow that hose to top of motor, the hose connects to thermostat housing. There are two bolts on it. If I recall, there is a bracket that holds up the belt tensioner that has to be removed/loosened to remove housing.

Posted on Sep 17, 2008

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Dash light says turned A/C off engine hot but temp gauge says 0


If the gauge reads 0, then replace the engine coolant temperature sensor first. Fill it and see if it still over heats. If so start looking for leaks and repair.

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Answer:

ok, you did a coolant service with STAT,

and it failed.

tell us what works right and wrong, symptoms only.

over heating? parked, (fan never comes on)? as it hits 225F?

under heating? ( fan stuck on , up North can cause huge cold engine)

dash gauge stuck low. (thermostat wrong heat range 180f is best. see FSM for spec. on this temp. spec..

Dash guage varies.? oddly (air in system)?

Dash gauge too high.? (Stat put in upside-down or bleed hole (jiggle) not UP side. higher side of mount , trapping air.)

Does something wrong happen only driving?

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My 99 aurora is running hot on the freeway,i'll changed my rad,water pump,and themostat...so got my fan switch rerplace and done a combustion leak test just to see if i had exhaust gasses in my coolant...


Is the air dam at the bottom of the front of your car intact? If not it will definitely cause the engine to run hot at highway speeds since not enough cooling air will be passing through the radiator.

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1 Answer

Coolant system


The car overheats because the fan system is not working. The engine coolant sensor tells the computer to turn on the fan when it gets hot and also sends temperature readings through the computer to the heat gauge. Try turning the AC on if you have it--it should immediately start the cooling fan. If nothing, check the fan fuse and relay. It's also possible that the fan motor is frozen due to bad bearings. Try replacing the coolant temperature sensor to see if that restores the gauge readings. Hope some of this helps!

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It sounds like the coolant temperature sensor is beginning to fail. It is highly unlikely that the in-dash gauge is a problem. The coolant temp sensor inputs to the computer affecting everything from radiator fan speed, engine fuel/air calibration and a variety of other parameters.

Be absolutely certain to "burp" every bubble of atmosphere from the coolant system too. Air bubbles have the amazing ability to prevent coolant flow and will cause all sorts of problems, especially if the bubble wants to hang around the temperature sensor location.

Normal operating temperature is going to be around 210 F.

Most Autozone, Advance locations will read engine problem codes at no charge, so drop by one of those locations and let them read the problem code.

My guess will be the coolant temperature sensor. Then have the problem code reset, remove all air from the coolant and let us know how this worked.

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Bubbling water in the water tank


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First where is the coolant temp at on the gauge, If the water isnt getting to 180 to 210 then you may have a stuck open thermostat.. Its also possible your water pump impellers are deteriorated to the point they dont push enough water. This is all based on knowing that noone put stop leak in the system. Stop leak could clog the heater core but not effect the engine and it could of caused the themostat to stick open. Also its possible your climate control knob is bad. I've seen then crack. Pull it off and look. Also listen with the fan on. Listen for the doors changing. Also do you have duel climate control. If you have heat in the back but not in the front then i'd suspect a control issue. If you have the same front anfd back I would suspect a coolant issue.

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1 Answer

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first of all check the radiator for leak or blockage. make sure the coolant is fresh. follow th eupper radiator hosr to the emgine block. there should be 3 bolts attached the themostat housing. take the themostat out and put it with hot water, maks sure the opens. the temperture sending unit should be directly under the themostat. msot likely the themostat is cause or the problem. unless the temperture gage is not reading correctly.

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