Question about 1996 Jeep Grand Cherokee

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What is the normal engine temp for a 1996 jeep grand cherokee?

The tempeture gage fluctuates for no apparent reason. Its not the thermostate and it has a new radiator with new hoses.

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Hi there iask,

I could call myself ianswer. My name is Mike. I've got a 91 wrangler that used to do the same thing.

With me it was an air pocket. The temp sensor responds to a heavy medium like water, not air. As an air pocket circulates and comes into contact with the sensor, your gauge will fluctuate.

I'm sure you checked the coolant levels already, but hear me out. What I'm suggesting is like chicken soup, it can't hurt, it can only help.

Just because a radiator looks full, doesn't mean it is. Air pockets can exist in the engine and heater core. We're going to get rid of any.

Checking the coolant level.

  • I know, you've been there, but I say this to everyone. First and foremost: BE SAFE!!! Wear safety glasses.
  • This should be done with the engine cool. Never open the coolant caps on a hot engine.
  • When you look in the radiator, do it from an angle, not directly in front.
  • Have a hose or a couple two liter bottles full of water available.
  • Take off the radiator cap. (Do not take off if engine is hot)
  • Is the water level low? If so, top it off.
  • Make sure the transmission is in either PARK or Neutral and set the parking brake.
  • Start the engine, put he HEATER and FAN on HIGH. Go back to the radiator..
  • Observe the water level in the radiator. If it drops, top it off again.
  • At first it should do nothing. The water will seem to just sit there. This is normal. The water in the engine is still cool. The thermostat is closed. As the water in the engine heats up, the thermostat will begin to open. When it does, you will notice the water level begin to surge up and down.
  • When the thermostat finally opens all the way, the water will start moving as it cycles through the system. You will be able to tell when this happens.
  • Does the water level drop at this point? If so, top it off while it's circulating. Adding water will close the thermostat. Be prepared to wait through the cycling two or three times until the water level remains constant during a cycling.
  • Make sure the heater is blowing hot air. Turn it off. wait a full cycle. Then turn it back on. Check another cycle for level drop.
  • When you don't need to add water any more, put the cap back on. Observe the temp gauge. Has it leveled off? If so, it was an air bubble and it's gone. If not, We go to phase 2.
Either way, let me know how it goes. If you have any other problems, click the ASK button.

Remember: Good things come to those who Rate.

Mike

Posted on Aug 06, 2008

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