Something to do with coolant system -
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Go Back > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > Something to do with coolant system

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Unread 06-22-2013, 10:04 AM   #1
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1989 XJ Cherokee 
Join Date: Feb 2013
Location: Bellingham, Washington
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Something to do with coolant system

I've been having this issue where if my heat inside is not on I leak coolant from this little cylinder right outside the firewall. I don't know what it is or if there's an easy fix rather than replacing the part. Summers comin up fast and it really sucks to have to have my heat on when its hot out. Any suggestions? What is that little can anyway?

89 jeep Cherokee Laredo

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Unread 06-22-2013, 11:09 AM   #2
AZ Jeff
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2014 JK Wrangler 
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Location: San Tan Valley Arizona, AZ
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Post a picture of "the little can", and we can help.
WANTED--MJ Comanche to restore. Must be solid, (relatively) rust free chassis. Send me a PM if you have a line on one that is for sale.
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Unread 06-22-2013, 02:15 PM   #3
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1995 XJ Cherokee 
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Location: Los Angeles / SFV, California
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If it's the part with 4 hoses attached to it, that is the diverter valve for the heater.
If yours is plastic, it may be cracked (I looked at mine too hard one day and it fell apart!) or the hose clamps might be loose.
(I just googled it and an 89 should be metal...)
If the clamps are tight then just replace the part.
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Unread 06-22-2013, 04:07 PM   #4
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1990 MJ Comanche 
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Location: Prescott, Arizona
Posts: 10,877
Or, just eliminate it. No ill effects to doing so. Plug the vacuum line and connect the coolant/heater hoses rogether.
Originally Posted by chris87xj View Post
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