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It sounds like it is low on coolant. Maybe try taking a heater hose off to let air out as you add coolant. This is just a guess, not a surefire remedy. I know dodge trucks have to be blead to let the air out of the cooling system, haven't heard of it on your vehicle. But heck, it cost's nothing to try it. If it doesn't, you may need to replace the water pump. It may be wore out and only pumping enough water when the engine is revved up. That is most likely it.
Is the issue there when using heat and air-con? If so, then check the blower motor and fan switch for fault.
Check any cabin air filter if fitted for clogging.
If only an issue with hot air flow, then check the heater matrix hasn't bunged up.
If only a cold air flow, then check the air conditioning car evaporator in the cabin for signs of clogging.
Clogging can be more of an issue in pet owner's cars as pet hair readily clogs up these two components in cars fitted with no interior air cleaner element/filter.
Heat and air conditioning are in separate systems. If you aren't getting heat, the first step is to check your coolant level. Low coolant can result in improper flow through the heater core. If you do have low coolant, be on the lookout for a coolant leak! If your coolant isn't low, then there is going to be an issue with circulation through the heater core. The heater core could be clogged in some way or another.1
This is a common problem on all Astro/Safari vans. The problem is a leak in the vaccum lines that control the vaccum switch responsible for changing air direction from the defrosters, dash vents, floor vents..etc. Many of the problems that plaque the Astro/Sarfari vans and many other "Mini-Vans" is the build up of excess heat in the engine compartment. It\'s a tight place to put a V6-4.3 Vortec engine and the heat generated bounces back and cooks everything on the engine (coils, modules, sensors, wiring, and of course plastic vaccum hoses). No need to mess with your switches or anything behind the dash -- replace those thin plastic vaccum hoses to operate the vaccum switch (located just below the A/C canisters, to the right of the heater/ac blower housing) and your dash switches will magically send heated or cooled air where you want it.
does front air work properly? for heat i mean?.. the blend doors are suspect as well as the heater hoses to the rear core and its heater valve.. possibily the control head is to blame or?, but i cant tell from here
you have the exact same problem i did. there's vacuum tubes behind the control panel (if i remember correctly the tube i had was black) and it will most likely be hiding down in your mess of wires as mine was, and you'll either need to photograph the tube and the vacuum connection hub and i'll walk you through what to do with it, or you can buy the haynes jeep manual for your specific year and style and it will be under cooling, heating and air conditioning systems (3-13) if you get the 1993 thru 2004 manual.
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