My 03 wont reach normal operating temp - Chevy and GMC Duramax Diesel Forum

01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 11 (permalink) Old 01-27-2011, 05:29 PM Thread Starter
 
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My 03 wont reach normal operating temp

Truck cranks fine but doesnt warn up until 15-20min of driving, and only warms up to about 185 degrees. Truck has low power until warming up. Any advise would be apperciated.

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post #2 of 11 (permalink) Old 01-27-2011, 05:31 PM
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as far as low power...could be allot of things i would suppose..first things first change ur fuel filter..could have got bad fuel...as far as temp..i think thats about normal..espeacially when its cold out thats all mine runs at...and being a diesel these do take some time to warm up.

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post #3 of 11 (permalink) Old 01-27-2011, 05:31 PM
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What's the temperature there?

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post #4 of 11 (permalink) Old 01-27-2011, 05:41 PM Thread Starter
 
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temp 24-50, plug it in every night, didnt have these prob. last year

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post #5 of 11 (permalink) Old 01-27-2011, 05:43 PM Thread Starter
 
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I have changed oil, and fuel filter, resent switch to Rotella Synthic.

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post #6 of 11 (permalink) Old 01-27-2011, 05:43 PM
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any check engine lights?? could be a thermostat...u do eventually get heat though don't you?

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post #7 of 11 (permalink) Old 01-27-2011, 05:54 PM
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I would say your thermostat is stuck open

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post #8 of 11 (permalink) Old 01-27-2011, 06:04 PM Thread Starter
 
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I have heard 05s have 2 thermostats, do 03 have 2?

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post #9 of 11 (permalink) Old 01-27-2011, 06:07 PM
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I would say you are experiencing normal behavior for a diesel in the winter.

You're "only reaching 185," because you're thermostats are 180* in the front and 185* in the rear.

Your "low power" symptom is caused by cold cylinders. Diesels like cold air in the intake, but the cylinder needs to be warm for proper combustion. The heat from the air/fuel being compressed is what drives your engine. It's not like a gas engine where there is a spark plug to detonate the fuel/air mixture. It's the compression that does it in our trucks.

You are experiencing normal conditions for the ambient air temp. Plug her in at night and she'll warm faster, but she'll still be cranky.

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post #10 of 11 (permalink) Old 01-27-2011, 06:17 PM Thread Starter
 
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thankx 4 all the help!

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