robfg67 Posted May 11, 2024 Share Posted May 11, 2024 I have a '90 MJ with the 4.0L & factory ac. With the ac on and the compressor running the electric fan will come on and run for 8-10 seconds and then stop for about 15 seconds. Shouldn't it run continuously if the ac is on? Thanks Link to comment Share on other sites More sharing options...
87MJTIM Posted May 11, 2024 Share Posted May 11, 2024 It should run with ac on. Is your ac working properly? Is it fully charged? Link to comment Share on other sites More sharing options...
RG67MA Posted May 11, 2024 Share Posted May 11, 2024 So the fan should run continuously with the ac on? I'll check the charge level with gauges the next warm day. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted May 11, 2024 Share Posted May 11, 2024 Check the fan relay while you’re at it. Could just be the relay starting to go bad. Link to comment Share on other sites More sharing options...
RG67MA Posted May 12, 2024 Share Posted May 12, 2024 I'll do that tomorrow and report back. Link to comment Share on other sites More sharing options...
cruiser54 Posted May 12, 2024 Share Posted May 12, 2024 Whenever the AC clutch is engaged, the fan comes on. If your system is low on freon, it will cycle a lot. Link to comment Share on other sites More sharing options...
RG67MA Posted May 12, 2024 Share Posted May 12, 2024 Started with the easier test first... I replaced the relay and the fan continued running with no interruption. Who knew that a 34 year old relay could go bad? Thanks to all. Link to comment Share on other sites More sharing options...
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