Chrysler & Jeep Cooling System & HVAC Service: Every car make has its quirks, and Chrysler and Jeep vehicles are no exception. In researching this article, we found several examples of heater problems in these vehicles that seem to be fairly common.
On 2001 and 2002 Sebring Sedan, Sebring Convertible and Stratus Sedan, plus 1993 to 2002 Chrysler Concorde, LHS, New Yorker and 300M, Eagle Vision and Dodge Intrepid models with V6 engines, customers may complain their engine is overheating, or the heater is putting out little or no heat.
Chrysler Technical Service Bulletin 07-002-02 says the problem can be caused by a low coolant level in the cooling system. On these vehicles, air trapped inside the cooling system can displace coolant when the system is refilled. The radiator and coolant reservoir may appear to be full, but there still may be air inside the heater core and heater hoses. This will create a low coolant level that may lead to overheating and low heater output. The bulletin provides a special fill procedure to eliminate the trapped air so the cooling system can be completely filled.
The procedure goes as follows:
1. Obtain Chrysler special tool 8195
(Cooling System Filling Aid). The tool looks like a funnel and attaches onto the filler neck (just as a regular pressure cap does). But it also has a hose clip.
2. Attach the filling aid tool to the cooling system filler neck. Use the clip to pinch off the overflow hose attached to the fill neck. Attach a 4-6' long 1/4" ID clear hose to the bleed valve. Put the end of the hose into a clean container (to prevent coolant from spilling onto the accessory drive belts).
3. Open the cooling system air bleed valve before any coolant is added. If you do not do this, air can remain trapped inside the system and you won't get all the air out. On 1998 and later models with 2.7L engine, the valve is located on the water outlet connector at the front of the engine. On 3.2L and 3.5L engines, the valve is located on the lower intake manifold, left of center under the upper intake manifold. On 1993-'97 models with 3.3L and 3.5L engines, the valve is on the thermostat housing.
4. Pour a 50/50 mixture of coolant and water into the large side of the filling aid funnel. Use distilled, deionized or reverse-osmosis purified water, not ordinary tap water, which may contain salt or minerals that could contaminate the coolant.
5. Slowly fill the cooling system through the large side of the filling aid. Watch the hose connected to the bleed valve. When a steady stream of coolant comes out of the hose, close the bleed valve and continue filling to the top of the filling aid.
6. On 1993-'97 models, place a small, clean container below the end of the overflow hose. Then remove the clip from the overflow hose. Any excess coolant in the filling aid will now drain into the overflow section of the coolant bottle or into the container.
7. On 1993-'97 models, remove the reservoir and recycle the excess coolant.
8. Remove the filling aid from the fill neck. Make sure the filler neck and cap are clean, then replace the pressure cap on the coolant bottle.
Note: 1998 and later coolant bottles have two chambers. Coolant will normally only be in the inboard (smaller) of the two. The outboard chamber is only to recover coolant in the event of an overheat and should normally be empty - except for the coolant drained from the filling aid. This coolant will be drawn back into the pressurized side of the cooling system over time.