My experiment regarding hood vents.
Junior Member
Joined: Oct 2018
Posts: 98
Likes: 22
From: Pacific Northwest
Year: 1989
Model: Cherokee (XJ)
Engine: 4.0L
Interesting! Given all the electronics that live on the firewall, I can't help but be concerned by unsealing the rear of the hood for cooling purposes. There are better ways to do it.
Senior Member
Joined: Jan 2017
Posts: 541
Likes: 70
From: Southern MD
Model: Cherokee
(2001 XJ)
The OEM setup has the ECU controlling the E fan? I assume it is via a relay?
If you add a manual control for the E fan I would assume you disconnect the ECU from controlling it,, as "backfeeding" the ECU with 12v would probably fry it ?
Asking because I may end up doing something to "extend" the E fan run time.
The OEM setup has the ECU controlling the E fan? I assume it is via a relay?
If you add a manual control for the E fan I would assume you disconnect the ECU from controlling it,, as "backfeeding" the ECU with 12v would probably fry it ?
Asking because I may end up doing something to "extend" the E fan run time.
CF Veteran
Joined: Mar 2015
Posts: 1,203
Likes: 155
From: Northern CT
Year: 1995
Model: Cherokee
Engine: Turbo 4.0
The added relay is after the factory relay output. You can adjust the fan on temp and settings with the mpvi2. Pricey unless you know someone with a module. Still costs 50 bucks to unlock the ecu, but then you can put a hot tune on it. Gettin tangential.
Mark, where is your diagram!
Mark, where is your diagram!
Last edited by Cummins93; May 26, 2021 at 04:36 PM. Reason: Mark!
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