Question about 1988 Dodge Dynasty

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Hello I have a 1988 Dynasty and the cooling fan does not cut in. I checked the volts in at the plug by the fan motor and there is only 5.4 volts at that point. I checked the ground connection and that is secure. I also hard wired the fan motor to the battery and it works fine. I do not know where the relay or switch is or if there is a resistor somewhere in the system. Can you help me out. Thanks Murray

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  • robin wheeler Oct 29, 2012

    My heater blower does not work. From what I understand from your comment, I can direct wire the fan motor, assuming it is good, to the battery. Did you install a toggle switch? In my dodge, the heater blower is located behind the glove box instead of in the engine compartment. I'm tired of having to scrape the frost off the inside of the windshield every time I have to sit for minutes in the winter.

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  • Dodge Master
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Check the wire sensor screwed located next to the thermostat housing.
If sensor checked ok,check the radiator fan relay.Its located in inner fender well on driver side.Check the other relays and fuses too.If any of them checked out faulty replace that also,. Check fig:--- Hello
I have a 1988 Dynasty - helpmech_7.gif

Its as per the service manual :-----------It says:----Conditions related to the radiator fan relay that may result in the radiator fans not turning ON or not turning OFF as designed:

CONDITION #1:---The screws that mount the relay to the left front frame rail may break -- Causing the relay to overheat and turn OFF because it no longer has heat sinking capability to the frame rail. If broken radiator fan relay screws are found, they must be replaced with revised screw P/N 06035202.Also the relay may have been damaged because of overheating (it may still seem to function normally) caused by the lack of heat sinking and should be replaced.
CONDITION #2:--Some vehicles may have an intermittent interference condition between the radiator fan blades and the fan shroud -- This causes a high current draw that will fail the radiator fan relay.
* The relay can fail in an open condition preventing the fan motors from running and causing the engine to overheat.
* The relay can fail in a closed position causing the radiator fans to continue to run with the ignition switch turned OFF. If a failed radiator fan relay is found, it must be replaced with revised relay P/N 04886288AA AND screws P/N 06035202.Revised relay P/N 04886288AA has a higher current capacity that is able to handle the extra current draw related to the intermittent radiator fan/shroud interference.
CONDITION #3:--A small number of vehicles may have corrosion develop in the radiator fan relay connector. On vehicles with this condition, the radiator fan relay connector should be replaced using pigtail service package P/N 04897034AA.You can get this relay and parts from local auto part store or from dealer.

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To check the relay follow this procedure as per service manual:---

Cooling Fan Relay:--Turn the ignition OFF. Then remove the relay.
Locate the two terminals on the relay, which are connected to the coil windings. Check the relay coil for continuity. Connect the common meter lead to terminal 85 and positive meter lead to terminal 86. There should be continuity. If not, replace the relay.
*
Use an ohmmeter to check for circuit continuity of the coil in the relay .Check the operation of the internal relay contacts. Connect the meter leads to terminals 30 and 87. Meter polarity does not matter for this step. Apply positive battery voltage to terminal 86 and ground to terminal 85. The relay should click as the contacts are drawn toward the coil and the meter should indicate continuity. Replace the relay if your results are different. If the relay functions properly during this test, inspect the coolant temperature sensor and the cooling fan system wiring for defects. The sensor is located next to the thermostat housing.

This should help.Thanks.Helpmech.

Posted on Jan 01, 2011

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  3. Disconnect the fan motor and motor connector.
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  5. Disconnect and plug the automatic transaxle cooling lines at the radiator, if equipped.
  6. Disconnect the coolant reservoir overflow hose.
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  14. Connect the upper and lower radiator hoses.
  15. Connect the fan motor and thermo-switch wire connector.
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