Heater problem

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Mar 9, 2018 | 05:45 AM

Nieratko79

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Newbie

Joined: Mar 2018

Posts: 6

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Model: Cherokee(SJ)

Heater problem

I have a 97 Cherokee sport, for some reason at higher rpm and speed my heater fan starts messing up. I only get heat coming out of the vents at low rpms. Does anyone know why this would be happening?

Mar 9, 2018 | 09:08 AM

RegularGuy

Seasoned Member

Joined: Apr 2014

Posts: 494

Likes: 4

From: Ohio

Year: 98

Model: Cherokee(XJ)

Engine: 4.0L

How do you mean, "messing up"/ as in, it only blows heat at lower RPM, and if you give it gas less heat comes out/it stops blowing?

Mar 9, 2018 | 09:31 AM

Nieratko79

Thread Starter

Newbie

Joined: Mar 2018

Posts: 6

Likes: 0

Model: Cherokee(SJ)

You can hear the fan is still going but at higher rpms it’s like it diverts and get stuck in between positions

Mar 9, 2018 | 10:22 AM

firebane

Senior Member

Joined: Dec 2017

Posts: 622

Likes: 9

From: Calgary, AB

Year: 1998

Model: Grand Cherokee (ZJ)

Engine: 5.2

Quote:

Originally Posted by Nieratko79

You can hear the fan is still going but at higher rpms it’s like it diverts and get stuck in between positions

Check all vacuum connections to ensure you have no leaks.

Mar 9, 2018 | 10:23 AM

Nieratko79

Thread Starter

Newbie

Joined: Mar 2018

Posts: 6

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Model: Cherokee(SJ)

Okay where do I start lol

Mar 11, 2018 | 05:15 PM

RegularGuy

Seasoned Member

Joined: Apr 2014

Posts: 494

Likes: 4

From: Ohio

Year: 98

Model: Cherokee(XJ)

Engine: 4.0L

does it blow out any air at idle? does it change where it comes from if you turn the selector ****?

I know on my 98, it still has the manual cable blend door, which i was very thankful to find. I'm not sure if the selector for where the air comes from is vaccum operated or not, but if its a cable, it might have Just come out of the lever like mine did.

Mar 11, 2018 | 06:47 PM

BillyBoy

CF Veteran

Joined: Aug 2009

Posts: 1,126

Likes: 30

From: Detroit, Michigan

Year: 1998

Model: Cherokee

Engine: 4.0

Open the hood. Idle the engine. Spray short bursts of starter fluid at the hard black plastic hoses that run around the firewall. Listen for the engine to rev up. Found your leak. Pay attention to the joints. And the ball in the front bumper passenger side.

Heater problem

Heater problem

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