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Old 02-13-2022, 03:32 PM   #1
Mfee2079
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Default Overheating with cold radiator

Trying to help a friend with his 2002 LW 300
I just did his timing belt and water pump but he now has an overheating issue
Thermostat is opening, fans are kicking on, upper and lower hoses are hot but radiator is cold as is the air being blown out from the fans
I'm leaning towards a clog in the radiator but anything I might be missing in this assessment pointed out to me would be helpful.
(3.0 V6)
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Old 02-13-2022, 05:56 PM   #2
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Default Re: Overheating with cold radiator

Are you sure the cooling system was refilled, engine started, allowed to idle as air remaining in the cooling system self purged with or without the coolant container cap on? On level ground, the cooling system will self purge any air in the system into the coolant container. A brief drive around the block will do the same. Then top off. Saturns do not have heater core shut off valves. Coolant always flows for immediate heating as the engine warms up, regardless of t-stat operation. Approximately 7 qts needed.

Last edited by fdryer; 02-13-2022 at 06:04 PM.
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Old 02-13-2022, 06:16 PM   #3
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Default Re: Overheating with cold radiator

Yes. Put in almost 2 gallons. Even if it was a little low the radiator should still get at least warm to the touch.
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Old 02-13-2022, 08:12 PM   #4
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Default Re: Overheating with cold radiator

How do you know the t-stat is opening? Temperature gauge needle moving from cold to ...? Can you connect a reader/scantool to monitor coolant temperatures from startup to overheating? It's rare for t-stats to stick closed when most open sooner, resulting in cooler running. Sometimes an error code points to the engine temperature being lower. L300s should be running 195F.
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Old 02-14-2022, 10:04 AM   #5
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Default Re: Overheating with cold radiator

Don't have a scanner with that capability. Needle goes from cold to over 3/4 mark with fans kicking on just below 1/2 way point.
Radiator fill bottle fills up completely when t-stat opens so I know that is working which happens when about time fans kick on.
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Old 02-14-2022, 10:27 AM   #6
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2002 L-Series 3.0L Sedan
2003 L-Series 3.0L Wagon
Default Re: Overheating with cold radiator

Possibly an issue with the water pump, or the installation
...
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