Why does the temperature gauge go up when the a/c is on but cools when you turn it off on a 2005 Jeep Liberty Diesel? (Jeep Liberty Heating / Cooling Air Conditioner Diesel)

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Question Details Asked:Jun 18, 2009 - 09:50 AMStatus:Closed

rolo922	Why does the temperature gauge go up when the a/c is on but cools when you turn it off on a 2005 Jeep Liberty Diesel? After running the a/c for a few minutes the temperature gauge goes up. I turn the a/c off and it goes back down to normal. I have to make a 125 mile trip to the doctor a few times a week and this Texas heat is too hot to be without an a/c or broke down on the side of the road especially in Dallas traffic. It is not using any water. The water level is still normal. Thanks.
	In Makes & Models > Jeep > Liberty In Maintenance & Repair > Heating / Cooling > Air Conditioner In Fuel Type / Drivetrain > Diesel 2 answers - 1461 days ago
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Answers

karjunkie 06/18/09 1:53 pm PST

You may just need to top off your coolant level. Check that first. Make sure the coolant reservoir is up to the line with coolant. If it is not that, have a mechanic check the A/C system. You may just need a new engine coolant sensor or the auxilliary fan may not be engaging because of a bad relay or switch.

mr_shiftright 06/18/09 2:26 pm PST

It's possible that your cooling fan is NOT activating when the AC is turned on---there are instances where it should activate---see below for details:

Vehicles Equipped with AC: In addition to using coolant temperature and battery temperature sensor to control cooling fan operation, the cooling fan will also be engaged when the ,air conditioning system is activated. The relay is also energized when air conditioning is selected and coolant temperature is above 95°C (203°F) , or, air conditioning is selected and battery temperature sensor is above 41°C (106°F) . It will then de-energize when air conditioning is selected and coolant temperature is below 92°C (198°F) , or air conditioning is selected and battery temperature is below 38°C (100°F).

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