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88 cherokee heat


 
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srinde
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Joined: 13 Oct 2007
Location: North Dakota

PostPosted: Wed Dec 05, 2007 9:01 am    Post subject: 88 cherokee heat Reply with quote

Mr. Green Hi all. i live up in sunny north dakota where i use my 88 4.0 cherokee to haul newspapers to carriers in small towns.I drive 140 miles every night and it has been -0f around here lately. I get ok heat out of my heater, but not great. Gauge stays @215-220 so i don't think the thermostat is an issue. Have cardbourd in front of grille.Like i say , i do get heat but even with it cranked all the way up it is not toasty in there and i have some frost on the windows. Have heard somewhere about reversing heater hoses, but they are different sizes, right ? Anyway any of you snow fighters out there have any ideas ?
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Franko
Member


Joined: 13 Nov 2007
Location: STL

PostPosted: Wed Dec 05, 2007 12:17 pm    Post subject: Reply with quote

Interested in this myself as my heat isn't very hot in the XJ versus my other vehicles.
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ThePhantum
Pissed-Off Admin
Pissed-Off Admin


Joined: 23 Jan 2004
Location: I knew it...I'm surrounded by Assholes!

PostPosted: Wed Dec 05, 2007 12:38 pm    Post subject: Reply with quote

The 88 has a closed cooling system...so it could be a couple of things. My first guess would be the heater valve. On closed systems, that valve has junctions that push coolant through the pressure bottle as well as the heater core. So the valve may not be pushing enough coolant to the core. The valve is also vacuum actuated....so it might be as simple as a cracked vacuum hose.

It's also possible that someone converted from a closed system to an open one and didn't change the valve. When a conversion is done the pressure bottle is no longer used, so either the valve need to be replaced with the correct one or the lines need to get plugged and spliced so that the coolant flows in the right direction.

The other possibility is some air trapped in the system. Normally when there is air present in a closed system, it causes overheating problems. So it's not a likely cause, but it is possible.

HTH
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