Question about 2001 Ford Taurus

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Temp gauge goes from cold to hot.

No leak in cooling system I need to know how to check the water pump. I already replaced the thermostat. The temp gauge went from cold all the way to hot. The air comming from the heater followed what the temp gauge showed. the car did not run bad or act up while this was happening. I have a squeek coming from the area of the serpentine belt but don't know for sure if its from the water pump or one of the iddler pullies.

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You can remove the rad cap and run the engine ( do not remove cap when hot!! ) You should be able to see the coolant circulating in the rad. You can also remove a heater hose and hold upwards and start engine, if coolant flows out the pump is circulating. If all looks good at that point I would start to suspect a cylinder head gasket leak and / or cracked cylinder head. Hope this helps .. Good Luck

Posted on Feb 05, 2009

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My 05 DeVille Keeps running Hot! Temp Gauge Goes Up And Down..Then Level out today.. So it's possible the thermostat Is Bad..


start there replace the thermostat

replace the temp sender
make sure the engine cooling fan comes on and spins fast enough
check for old or soft hoses and how tight the clamps are

if temp is still up and down might be
air or a leak in the system

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Why would 2002 ford ranger 3.0L temp guage stay on extreme cold after water pump replacement?


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Not sure I follow your wording on the different temps. If the system is full of coolant and working correctly, the thermostat should open at 195 degrees which would be several miles down the road. Once the thermostat opens both radiator hoses should be warm. If the water pump is not working the engine will get hot very quickly.
Have you tried running without the thermostat to see what happens ?

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1998 BMW 528 recently replaced radiator, water pump & pulley temp gauge sat middle all good THEN 2 months after all this temp gauge goes past middle then dropped back to middle . Next day temp gauge...


It could be the thermostat but you need to check the fluid level and for any leaks (these could even be pin hole) first. If you have one of those infra-red temperature gauges you can check the temperature of the cooling system in the engine bay to double check. Generally the engine temperature should not go much about 90 deg C - this is when the electric cooling fans kick in - are these turning on?

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1998 Saturn Wagon 2 For the last few months my car cooling system seems to be running hotter than normal per the dash gauge. For years and even the the summer the temp gauge would never get over 1/4. I...


I would do a sniff at the tail pipe to make sure you are not pumping coolant out the exhaust pipe.
sound more like a bad gasket than a bad water pump to me.

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My truck starts running hot then I turn the heater on and it blows cold air but every once in a while the heater will throw out hot air. Then the temp gauge will go down. I've check med the radiator cap...


I'd still check the thermostat. Or basically just replace it. Have you ever drained all the antifreeze and flushed the system? Good time to do both. If the hose's get real hot that doesn't really mean the thermostat open. Wouldn't they get hot even if the thermostat didnt open.? If the thermostat was stuck open you'd would have cold air and low temp gauge. Then maybe hit a pump or something and have the thermostat stick closed and have high temp. Maybe water pump. Check it when you have the belt off. Spin, pull & push the water pump pulley around. I'd replaced my water pump at about 110,000 on a '97 dodge Dakota. My 97 never had a very good heater. Always heated up more after driving. Idle never got it warmed up.

Jan 14, 2011 | 1999 Dodge Dakota

1 Answer

The high temp gauge will max out and then back to normal. Also the heat will not work then kick in all of a sudden.


Let me guess...When the temp gauge goes hot, the heater goes cold, and vice versa? Check your coolant level first in the radiator (when the engine is COLD) and also in the overflow reservoir. ONLY use a 50/50 mix of coolant and water, using the same COLOR coolant that is already in the radiator (if it's green, buy green, if it's orange/red, buy orange/red). Next thing to have checked/replaced is the thermostat which is inside the cooling system of the engine. Finally, and the most expensive, have the water pump checked/replaced.

I would put my money on low coolant level in the radiator. As the engine heats up, the coolant will "surge" through the system as the water pump tries to **** air through the system due to low coolant level. If the coolant isn't flowing, the heat can't escape the engine block and it starts to overheat.

Dec 19, 2010 | Chevrolet Monte Carlo Cars & Trucks

2 Answers

Thermostat?


It actually sounds to me like you're low on coolant. My Jeep leaks coolant and whenever it gets low the temp gauge will go real high and then drop, and the heater doesn't work well. This is because the cooling system of your car is supposed to be a closed system, full of coolant and no air. When coolant leaks out, the space it used to occupy is now occupied by air, which does not transfer heat well. When 'air' is passing through your cooling system, no heat can be transferred from your engine to the heater and radiator, resulting in a hot engine and no heat at the heater. Then when a pocket of water passes through the system, the temperature gauge quickly falls as the water absorbs the heat from the engine. The hot water that cools the engine is where the heater gets it's heat from as well, so when water passes through the heater core, the heater works, but when it's filled with air, it doesn't.

Hot water runs through the heater core regardless of whether or not your thermostat is open or closed. That's why your heater works in the winter even before the engine is at normal operating temperature. The fact that the heater stops working is a good sign that the thermostat is probably not the culprit.

As for the water pump. If the water pump was bad, your temp gauge would go into the red and stay there. Water pumps generally don't work intermittently. Either it's good and ot works, or it's bad and it doesn't.

However, if you are in fact low on water, as I suspect, it means you probably have a leak somewhere. The leak could be in the water pump housing gasket, so depending on where you take it for repairs, they may try to sell you a new water pump anyhow. So just beware of that.

Feb 12, 2009 | 2004 Chevrolet Blazer

4 Answers

Heater blowing cold air


My 2005 Nissan Sentra 1.8s with 55,000 mi. blows cold air from the heater. Coolant not circulating in engine. Lower hose stays cool to touch. Both heater hoses cold. Changed thermostat - didn't fix it. Coolant not leaking or dirty. None in oil - no oil in radiator. Changed worn water pump belt - pump spins freely with no noise or resistance. Cooling fans come on after warm-up. Temperature gauge stays in normal range then jumps to hot and back again. Coolant good to 10 below - didn't freeze here yet. No other problems or repairs to car. Afraid to drive and make worse. Help!

Dec 22, 2008 | 2002 Nissan Sentra

1 Answer

Coolant system


Hello there,

Either an air bubble, the thermostat or the water pump.
  • Air bubble (pocket) - Just because the radiator is full, doesn't mean the engine is. When an air bubble circulates through an engine it will cause the temp gauge to swing from hot (when water is in contact with the sensor) to cold ( when air is in contact). The less water, the hotter the engine. Easiest fix - add water.
  • Thermostat - Keeps water circulating in the engine separate from the water in the radiator until it gets to a certain temperature. At that point, it opens and allows the hot engine water and the cooler radiator water to cycle. Hot to radiator, cool to engine. As the cooler water flows over the thermostat, it closes, allowing the cycle to repeat. If it opens at the wrong temp, or not at all, your engine will overheat. Water will begin to boil. Steam will make the temp gauge swing erratically.
  • Water pump - If the water pump is failing (sometimes the impeller will come of the shaft), the water will not circulate. Same results.
Troubleshoot:
  • First and foremost: BE SAFE!!! Wear safety glasses. Start this with the engine cool. When you look in the radiator, do it from an angle and as far away as possible.
  • Have a hose or a couple two liter bottles full of water.
  • 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.
  • Observe the water level in the radiator. If it drops, top it off again.
  • At first it should do nothing. 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.
  • Check your temp gauge. If the gauge getting close to the 'Red Zone', the thermostat should have begun cycling before now. Go back to the radiator and check it.
  • When (if) the thermostat finally opens all the way, the water will start moving as it cycles through the system. You will be able to tell the difference.
  • If you see the water flowing, the water pump is ok.
  • If the water does not start to move and the gauge is getting close to 'Red', shut the engine down and let it cool. Do not put your face near the radiator. If the thermostat suddenly let go, The hot water, driven by steam, could erupt out of the filler hole. Replace thermostat. Rerun this test. If results are the same, replace water pump.
  • Does the water level drop at this point (air bubble)? If so, top it off while it's circulating. Adding cold water will close the thermostat. Be prepared to wait through the cycling two or three times.
  • Check the temp gauge again. Has it leveled off?
  • When you don't need to add water any more, put the cap back on. Observe the temp gauge for a few more minutes. has it stopped the erratic behavior? If so, it was an air bubble and it's gone. If not, replace the thermostat.
Let me know how it goes. If you have any other problems, click the ASK button.

Remember: Good thing come to those who Rate.

Mike

Jul 28, 2008 | 1998 Saturn SL

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