Question about 2005 Nissan Pathfinder

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When I turn on the air only hot air blows out. was diagnosed and found that the electric fan mounted on the condenser won't turn on. Fuses and relays check out ok as does coolant. What controls the fan?

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  • alrt08 Jul 29, 2009

    Thanks Thundergod for your help. The fan was working just fine. We ran a second pressure check through the system at a higher pressure and found out there was a small leak. Now fixed hopefully but if not, the problem was found.

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  • Nissan Master
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Hot wire the fan to the battery...If it fails to go on, the fan itself is bad. You sure the compressor is engaging? Generally even if the fan isn't on, there is enough air going through the grille to keep a/c cool.

Posted on Jul 28, 2009

  • Richard Scordino Jul 29, 2009

    The coolant sensor on your engine feeds info to the computer as well as the temp light/gauge. the computer sends signal to relay to turn the fan on. When a/c is engaged, part of the system is bypassed, sending signal to fan relay either from the dash control or blower relay. If ac relay is working (a/c engaging) and fan relay is good, the fan signal is passed directly to the fan. If the fan motor has failed it will not come on. To check that, the easiest way is to unplug it from the harness and run a direct line (hot lead and ground) and attach it directly to the fan. Even if you attach the leads backwards the fan motor should come on. If it does not the motor itself is bad. While driving at highway speed, the air flow through the front grille is actually sufficient to keep the a/c condenser and engine radiator close to normal and therefore the engine will not overheat and the a/c should operate normally.Of course that will change at low speeds and city driving where air flow is limited.

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