A/C makes temps climb: what is normal and what is not

Overview

A small temp rise with the A/C on is normal, the condenser sits in front of the radiator and adds heat. But if the gauge climbs noticeably, the fans aren't keeping up with the added load. A fan clutch that barely passes the basic test will fail the moment the A/C comes on. That's usually the first sign the clutch needs to be replaced.

What you need

• Basic hand tools
• Flashlight
• Optional: multimeter

Quick checks first

1. Quick check 1
2. Quick check 2
3. Quick check 3

Step-by-step

1. Step 1
2. Step 2
3. Step 3

If that did not fix it

• Next likely cause 1
• Next likely cause 2

Source links

• NAXJA: XJ Cooling System Deficiencies and Solutions
• Off Road Xtreme: Cooling problems and cures

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