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2015 200c 3.6 running hot

155 Views 2 Replies 2 Participants Last post by  BrianP, 
B
Been fighting this problem for awhile, temp gauge goes up to the mid 230’s comes down to the teens and repeats. Checked everything and had it at the dealer who replaced fan and radiator and said it was fixed, didn’t help and they ended up refunding my money. Water pump okay, thermostat okay, temp sending unit okay, belt tensioner okay, not losing coolant, replaced fuse block(internal fan relay), replaced ECM since it controls the fan.
Went out today and unplugged the fan and ran the car, temp got up to 222 and I plugged the fan back in, it ramped up to high speed and within 30 seconds you could definitely hear the fan slowing down to low speed even though the temp was still over 215. Why would the fan slow down like that even though the temperature hadn’t dropped back to “normal”, bad program on the ECM? That’s my thought since it controls the fan speed.
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200_S_AWD
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Has it had a coolant flush yet? An OAT coolant meeting Chrysler MS-12106 mixed 50/50 with distilled water is best.
Concentrations that vary from 50/50 can lower the boiling point & reduce heat-absorbing efficiency. The radiator fan is only used for lower speeds & stops. At road speeds over 30 MPH (48 KPH) enough air should be pushed through to maintain cooling.

Does this 'over-heat' occur at highway speeds or in stop & go traffic?
Note on the Radiator Fan Control table below, that the radiator fan doesn't turn on until 220℉ (104℃). It doesn't turn back off until 214℉ (101℃).

Air trapped in the system can cause gauge fluctuations. These aren't the easiest cooling systems to burp. See the Coolant Fill procedure below.
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B
Hopefully I can answer all your points, first off I bought this vehicle new and it always ran at 203 degrees no matter what. Several years ago I had a quick release radiator hose fitting break after having a leaking water pump replaced. Since then the temperature readings have been all over the place getting as high as 251. System has been flushed and checked for flow, proper coolant has been used by me and the dealership. The temperature fluctuates both highway and stop and go but tends higher in stop and go. The test with the fan today was with the car parked in the driveway.
200_S_AWD said:
Has it had a coolant flush yet? An OAT coolant meeting Chrysler MS-12106 mixed 50/50 with distilled water is best.
Concentrations that vary from 50/50 can lower the boiling point & reduce heat-absorbing efficiency. The radiator fan is only used for lower speeds & stops. At road speeds over 30 MPH (48 KPH) enough air should be pushed through to maintain cooling.

Does this 'over-heat' occur at highway speeds or in stop & go traffic?
Note on the Radiator Fan Control table below, that the radiator fan doesn't turn on until 220℉ (104℃). It doesn't turn back off until 214℉ (101℃).

Air trapped in the system can cause gauge fluctuations. These aren't the easiest cooling systems to burp. See the Coolant Fill procedure below.
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