Cel Po128

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Mar 6, 2008 | 07:16 PM

shadows4

Thread Starter

Tuned

Joined: Jul 2002

Posts: 462

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From: Kansas City, Mo

Cel Po128

I usually post in the Excursion forum but need help with wife's Expy. 2004 5.4, 203,000+ miles. Got this code for the second time today after about an hour to hour and a half drive. Code reader says (Coolant temperature below thermostat regulating temperature). Could I need a new thermostat? Thanks in advance for any help. John

Mar 6, 2008 | 08:44 PM

sbclemens

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Joined: Aug 2004

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Likes: 1

Does it take longer for the engine to heat up when first started? It could be the thermostat or the temperature sensor.

Mar 6, 2008 | 09:11 PM

shadows4

Thread Starter

Tuned

Joined: Jul 2002

Posts: 462

Likes: 5

From: Kansas City, Mo

Quote:

Originally Posted by sbclemens

Does it take longer for the engine to heat up when first started? It could be the thermostat or the temperature sensor.

There appears to be no change in how long it takes to heat up.

Mar 7, 2008 | 06:30 AM

projectSHO89

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Joined: Jan 2004

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From: St Louis

Replace the thermostat.

Mar 7, 2008 | 08:13 AM

Eddie Hudson

5th Wheeling

Joined: Aug 2006

Posts: 35

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Quote:

Originally Posted by shadows4

I had been driving in the mountains for about 1 hour when the ses came on. When I got home I pulled a P0125 - Insuff Cool Temp code. The temperature gauge looked normal but when I hooked up the scan tool and drove around for a couple of days, the engine temperature stayed at 161 - 163 degrees. After replacing the thermostat my crusing temperature stayed at 192 and my gauge rose about 1/16" - 1/8".

Like the man says, change the thermostat