scanned a 1999 saturn sl1, 2 p codes came up, p1651 and p 1620. changed the cooliant temp sensor, i now have cooliant comming out the over flow, need help with thos one, thank you.


Asked by Sep 19, 2015 at 04:10 PM about the 1999 Saturn S-Series 4 Dr SL Sedan

Question type: Maintenance & Repair

first time this has happened, i have no
idea why cooliant is comming out the
over flow.

5 Answers

Paul Martin

Hi have you done a coolant flush lately because you might have a blocked coolant channel or something some kind of blockage in the system that's making it overflow where It can't go all the way through the system could be a bad water pump what's the diagnostic of your system what's your maintenance record on it


The problem is with the radiator cooling fan circuit (P1651) and the low coolant circuit (P1620). Sounds like the cooling fan isn't coming on like it should and the engine is overheating. HTH. -Jim

Paul Martin

OK I think there is a way you can bypass the fused circuit & have the fan run all the time when the key is turned on put you would have top look for the details online. Have you ever changed your thermostat Could be bad or installed backwards plus check your fuses & your wiring harness for dirty contacts etc. Paul

Paul Martin

copy and paste this and check this out this might help you ? http://www.obd- t=9470

Paul Martin

Let me know if this helps

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