Engine Temperature Guage on Dashboard indicates overheating
A few months ago, I replaced the radiator, radiator cap, lower & upper radiator hoses, fan clutch, water pump & gasket, thermostat & gasket, serpentine belt and this last weekend the coolant temperature sensor. The engine temperature gauge on the dash runs hot (betwen 210-260). Sometimes when idling, the needle will dart into the redzone (260) and then immediately retreat back to between 210-260. The Jeep is not leaking coolant. I'm puzzled what the problem could be. Please help.
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Re: Engine Temperature Guage on Dashboard indicates...
Hi and welcome to FixYa,
Offhand, your described condition indicates a sticking thermostat, that is there is considerable delay before the thermostat opens. It is also possible that there is some restriction wherein the thermostat is not opening completely when the triggering temperature has been reached. As a test and to confirm, you could try temporarily removing the thermostat and operate the engine without one; observe temperature. The side effect of this test is that it would take some time to warm-up the engine, but operationally should not cause anything untoward. Of course, care has to be exercised that the gasket would still be intact.
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Well Michael put your hand on radiator upper hose and then the lower hose right after car warms up and just starts overheating is there a temperature difference if so one of two things is going on thermostat not opening even though it is new or there is still an air bubble in the cooling system if nthere is no difference and still overheating might have to explore headgasket being blown
check, temperature of upper radiator hose vs. lower radiator hose, also if there are any cold spots in radiator usaully indicates bad thermostat. all hoses and surface of radiator should be hot in order to keep engine cool
Boiling over, of just running Hot? If running hot, leave the rad cap off, let the engine come up to operating temperature. Put a probe into the rad, check the temperature. If temp is ok. I would lean toward a failing temp sending unit.
Check restriction in the rad, make sure it isn't plugged.
Is there loss of power? maybe the exhaust system is restricted.
Hope this helps.
Do you think that it's overheating because the temperature light is on? If so, then it's possible that you have a bad temperature sensor and not an overheating engine. Look for other signs of engine overheating : 1.Sluggish engine operation. 2. Detonation upon acceleration (pinging). 3. Rough, uneven engine idle. 4. Coolant boiling in overflow tank. If your vehicle is experiencing these symptoms, then overheating is indicated. One of the most common cases of overheating is a bad thermostat. Another common problem is a faulty cooling fan or fan circuit. The cooling fan can be checked by running the engine at operating temperature and turning on the AC control. if the fan does not come on, then a problem with the fan circuit is indicated. The thermostat can be checked by placing a cooking thermometer on the motor near the upper radiator hose where it attaches to the motor. the temperature should not go above 225deg. If it does, then replace the thermostat. If the temperature stays at or below this rating, then replace the temperature sensor. I hope that this information helps you with your problem and thank you for using Fixya.com.
WARNING : Be very careful when working around cooling systems when the engine is at operating temperature. DO NOT open the radiator cap (if equipped) or even the overflow tank cap when the system is hot. Always wear safety glasses. Remember that electric cooling fans can operate at any time, even after the engine is off. Keep hands away from fan when working in the engine compartment.
First check if you have any leaks in the cooling system , then check if level is correct(radiator and expansion tank , check level when car is cold , never open radiator when it's hot).
Then verify operation of radiator fan , if it's electrical fan it should comes on when temp. goes over normal,
if it's a clutch fan- it should pick up a speed and be more loud. If fan is not on and engine is starting overheating , check upper and lower radiator hoses.
If upper hose hot and lower hose cold or warm then you might have stuck close or prtially closed thermostat , difference between lower and upper hoses when t/stat works ok is about 10-15 degrees,
not really noticeable for hand.So if you don't feel a lot of difference between hoses temp. , and fan is not on , check fan or fan clutch itself.
If lower hose cold , replace thermostat and purge system.
If everything above is working properly , and it's still overheating , you may have bad water pump or head gasket.
Tools: 1. Combination Wrench Set 2. Screwdriver 3. Flashlight 4. Cooling System Pressure Tester 5. Needle Nose Pliers 6. 3/8 in. Drive Ratchet 7. Socket Set
Supplies: 1. Coolant
Steps: 1 Open the hood and locate the vehicle’s radiator. o Tip: Safety Tip:Always wear safety glasses when working on your vehicle. Wear other personal protective equipment (PPE) when necessary, for example latex gloves or safety shoes.
2 With the engine off and cold, remove the radiator cap.
3 Place a drain pan under the radiator. Remove the drain plug or remove the lower radiator hose to drain the cooling system. o Tip: Twisting the hose or using a screwdriver may allow easier removal. o Tip: Lifting the vehicle will give better access to the lower radiator hose.
4 Remove the upper radiator hose.
5 Remove the radiator fan shroud or remove the electric cooling fan assembly. o Tip: Transmission cooler lines will need to be removed when replacing the radiator.
6 Remove the radiator. o Tip: Some older metal radiators can be taken to radiator repair shops for repair.
7 Install the new or repaired radiator. Make sure it is aligned.
8 Install the lower radiator hose and clamp. o Tip: Replace the hose and clamps if necessary.
9 Install the radiator fan shroud or electric cooling fan assembly.
10 Install the upper radiator hose and clamp.
11 Fill the radiator and radiator reservoir with a 50/50 mix of coolant and distilled water.
12 Install the radiator pressure tester and check for additional leaks.
13 Re-install the radiator cap and start the engine.
14 Monitor the engine temperature. o Tip: DO NOT allow the engine to overheat.
15 Road test the vehicle, maintaining supervision over the temperature gauge.
16 Verify repair by inspecting for leaks or overheating.
When you mention the radiator having a hot upper in pipe and a cool bottom out pipe tells me that the coolant is not moving around the engine. This could be down to a water pump not working, blocked radiator, thermostat not opening. The bottom hose should be cooler than the top hose but once the engine is up to working temp which is around 85/90 degrees c for an audi the bottom still should be farly hot to touch. Hope this helps