Question about Jeep 2002 Liberty SPORT

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Why, in warm/hot weather only, does temp gauge reads hot when accelerating?

Newer radiator and thermostat. Heat and A/C work fine. Gauge returns to center when car is idling

Posted by Anonymous on

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Posted on Jan 02, 2017

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SOURCE: 1998 jeep grand cherokee cooling problem

Your thermostat is stuck closed. It needs to be changed right away. By the way the operating temp on that motor is 160 degrees so you are running hot you have just been lucky so far. Good Luck

Posted on Dec 01, 2008

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SOURCE: Temp gauge goes to full hot while at Idle

Check the auxiliary cooling fan for operation. As the engine temp rises, it should kick on to bring the temp down. U may have a bad motor on the fan, or more likely a bad fan switch.

Posted on Dec 22, 2008

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SOURCE: How do I diagnose a bad thermostat or temperature

You can remove the thermostat and put in a pot of water and boil it.(should open near the stamped temp on yours, 195f) From what you have posted, ti seems that you have a partially obstructed radiator core and at present, it's just bad enough for the electric fan to deal with it. (you can actually see that the temperature fluctuations happen when the fan is on and off) If you do not clean out the radiator, eventually the fan will not be enough to lower the temp and it will begin to actually go into overheat.

Posted on Jun 07, 2009

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SOURCE: Temp gauge goes high. Radiator leak just the

It could well be a faulty thermostat- test or replace same.
Could also be a blocked radiator core, - check coolant or airflow is not restricted,
Ensure any radiator leaks are repaired,
Ensure coolant level is correct, without airlocks - bleed as necessary on re-fill,
Check operation of cooling fan - ensure fan runs at appropriate engine temperature - if not check sensor switch and associated relay operation.
Thermostat is located at the end of top radiator hose where it connects to engine housing.

Posted on Aug 11, 2009

  • 19 Answers

SOURCE: the temp gauge on the instrument panel was

Sounds like the radiator is clogged, have the cooling system flushed, the water pump pumps water into the engine and it comes out the top hose to return to the radiator to circulate through it to cool, if the radiator is clogged the water pressure will build on the top hose, also look at the bottom radiator hose, if it collapses when you rev the engine the radiator is clogged, although sometimes the bottom hoses are reinforced with wire to prevent them from collapsing so just because they do not collapse it does not mean the radiator is not clogged.

Posted on Mar 01, 2010

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Temp/gauge not reaching normal working temp-richer

the first thing to check is to feel if the radiator is hot, if the radiator feels hot and the engine is also hot the coolant is circulating ok then the problem is more than likely electrical, the temp gauge gets its signal from the engine control module the coolant temp sensor sends coolant temp signal to engine control module for engine managment purposes then passes it to instument pack/gauge, if the sensor was at fault you would have engine running problems also,with poss fault codes logged, if the engine and rad are cold/only warm after the engine has been run for 15 mins or so it sounds like the thermostat is stuck open but you have changed that. i have had faulty new ones in the past and have had to test them in a pan of boiling water, hope this is some help to you.

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is your fan working for the radiator? you will have to make sure it's coming in, a next factor could be your radiator needs to be service.

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My air conditioner blows warm air when stopped and idleing

Possible problems.

Air conditioner blows warm air?
Possible solution, system may need to be recharged.

You also wrote, temp light come on, gauge reads hot.
First check coolant level, always check this first.
Next, check your radiator hoses.

Next, have your thermostat checked, or change it. Their rather inexpensive.

Good luck.

Jun 20, 2012 | Air Conditioning and Heat for Pontiac...

1 Answer

My 1991 volvo740 bertone coupewater temp. gauge doesn"t move at all after the engine is warmed up. The upper hose is hot. The water in the resevoir is cool as is the bottom radiator hose. There was...

The thermostat is on top of the engine, just aft of the upper radiator hose. The temperature sensor (first one, closest to the front of the engine) is the one responsible for the coolant temperature gauge. It's an NTC with two resistors in it - one for the sensor gauge, one for the ignition computer. There is a second one for the Luftmassenmesser Hidtstraht system, bottom right side under the intake manifold.

If you have a drop of anti-boil on the water pump - it is coming from the weep hole and this is indicative of failure of the internal seals on the pump and it must be replaced.

There is a possibility that the thermostat is stuck closed, which can be easily verified in cool weather by cool air coming out of the vents at normal operating temperature. Check the heater core hoses - one should be warm.

Be careful when working on the cooling system - it can scald when hot! Always work on it with the engine cool to the touch and never put cold anti boil in a hot engine.

Checking the temp sensor is easy - remove the connector and place a 68 ohm resistor across both terminals (or one to ground if it is a single spade connector). The temp gauge should read approximately 3/4 across the scale. Don't short it to ground as this could destroy the sensitive coil inside the sensor. If no reading occurs, then the gauge or wiring is broken.

Jan 07, 2011 | 1991 Volvo 740

1 Answer

Are there problems with the thermostat gauge not show proper temperture readings. 1999 vw jetta 2.0 gauge shows no temp reading. Is it a bad thermostat and needs to be changed. And can you harm the...

If you are not getting a signal to your gauge, your car can still run. You just won't know if your car is overheating until it is too late. A bad thermostat won't keep your gauge from working. The temperature sensor that sends the signal to the gauge will keep it from working.

The thermostat helps your car in extreme weather. It helps your engine warm up in extreme cold so your heater will work sooner. And it helps you car cool itself off in extreme hot weather. As your engine water temp rises, the thermostat will open allowing the water in the radiator (that has been cooling) to flow into the engine block. The water that was in the block will go into the radiator to begin cooling.

In fair weather, you don't need a thermostat.

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