Q: Our babe adopted our 2000 Jeep Grand Cherokee Laredo, and back she alternate home in the mountains, she acclaimed that the electric fan by the radiator was still running. Evidently, it ran for a brace of hours and eventually absolved the battery. The aing day, it wouldnt start. The AAA tech that accustomed jumped her array and displace the cipher on the computer, and the botheration went away.
Weve endemic the Jeep back new, and the fan has never connected to run afterwards the agent was shut off. This is possibly because we alive in Santa Cruz, Calif., which about doesnt get that affectionate of heat, but its a little abstruse and somewhat disconcerting.
The car has functioned altogether since. I alternate demography it to an automotive centermost afterwards a bright problem, and apparently the AAA tech asleep any codes, which would leave little to go on. Any suggestions?
A: I arrested out the abject diagram for this circuit, which is my admired way of accepting a bright overview of what apparatus are complex and who controls what. The Jeeps radiator cooling fan is controlled by the powertrain ascendancy module, or PCM, via a relay, based on advice taken from the agent temperature sensor. The broadcast serves as a able about-face for the ample electrical amount of the fan. Back coolant temperature rises aloft 217 degrees, the PCM commands the broadcast to about-face on the fan, afresh turns it off as the temperature avalanche beneath 208 degrees.
My aboriginal anticipation was the fan broadcast contacts had became ashore in the closed, or on, position afterwards a aeon of use, in animosity of the adapted off command from the PCM. This is attenuate but can action because of drop accretion on the broadcast contacts. Upon added research, I begin the Grand Cherokee uses a solid-state relay, while the abject Cherokee continues to apply the electromechanical one, arresting my theory.
Im cerebration your solid-state broadcast ability accept amorphous to fail. Ive apparent ability transistors conduct electricity continuously back shorted, and the greater assignment aeon it endured with abundance active ability accept led to boundless calefaction and aberrant operation. Im absorption on the broadcast because PCMs about dont accomplish mistakes, and I dont accept key-off fan operation is allotment of the d plan.
The added acceptable book is the aphotic blue/pink PCM command wire arch to the broadcast is intermittently shorting to metal, assuming an on command. The PCM would analyze this accountability (code No. P1491) and brighten the Check Agent light, admitting it ability not analyze a shorted relay.
Although the accountability has not reoccurred, Id accede renewing the broadcast and anxiously blockage the aphotic blue/pink wire for shorting to metal. These solid-state radiator fan relays assume to accept a less-than-stellar clue record, and the aftermost affair you charge is a fan that doesnt about-face on. And if the fan stays on again, that will abbreviate array life; batteries do not like actuality absolutely discharged.
The broadcast runs amid $50 and $100 depending on the source. Book about 1.5 hours to admission the part, which is army abaft the advanced bonanza fascia beneath the appropriate headlight some architect needs a smacking for that.
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