Ok im stumped - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**scotts62** · 10-20-2012, 05:54 PM

Have a friend with an '02 chevy 3/4 ton 6.0 CNG/Gas and it is having a overheating problem on long distance hauls. He changed the water pump, thermostat and flushed the system a couple times and it still does it. He brought it over for me to look at and i went and drove about 5 miles down the hwy and it runs great and temp is right at 200 until you hammer down on it and it jumps to 220 and if you do it again approx 80 mph it slowly climbs towards 260. It didnt seem like it was getting warm to me at first and i replaced the sensor and washed through the coils on the radiator and condenser and it still does it.. head gasket maybe?? Any ideas??

Thanks

clinebarger · 10-20-2012, 06:41 PM

Clogged radiator? Classic symptoms when getting hot a high speeds, Does it cool down when you slow down?

**scotts62** · 10-20-2012, 07:58 PM

Not fast but yes temp does drop a bit.
take cap of before it warms and its normal like every other truck, kind of see it flowing and both upper and lower radiator hoses feel the same temp but my thermo infared gauge at work so I can't tell exactly.
Posted via Mobile Device

**truckdude239** · 10-20-2012, 08:06 PM

we had an 03 zr-2 s-10 that would only over heat at highway speeds or pulling a tailier it was the radiator, we installed an after market rad on it and it over heated ever since installed a new dephi radiator and it hasn't over heated anymore

**scotts62** · 10-21-2012, 12:22 PM

Ok ill try that and see, thanks

10-20-2012, 05:54 PM	#1
scotts62 One day... Join Date: Apr 2008 Location: Tuttle, Ok Posts: 9,243	Ok im stumped Have a friend with an '02 chevy 3/4 ton 6.0 CNG/Gas and it is having a overheating problem on long distance hauls. He changed the water pump, thermostat and flushed the system a couple times and it still does it. He brought it over for me to look at and i went and drove about 5 miles down the hwy and it runs great and temp is right at 200 until you hammer down on it and it jumps to 220 and if you do it again approx 80 mph it slowly climbs towards 260. It didnt seem like it was getting warm to me at first and i replaced the sensor and washed through the coils on the radiator and condenser and it still does it.. head gasket maybe?? Any ideas?? Thanks __________________ Scott 93 crew cab build Project 62

10-20-2012, 06:41 PM	#2
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: Ok im stumped Clogged radiator? Classic symptoms when getting hot a high speeds, Does it cool down when you slow down?

10-20-2012, 07:58 PM	#3
scotts62 One day... Join Date: Apr 2008 Location: Tuttle, Ok Posts: 9,243	Re: Ok im stumped Not fast but yes temp does drop a bit. take cap of before it warms and its normal like every other truck, kind of see it flowing and both upper and lower radiator hoses feel the same temp but my thermo infared gauge at work so I can't tell exactly. Posted via Mobile Device __________________ Scott 93 crew cab build Project 62

10-20-2012, 08:06 PM	#4
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,238	Re: Ok im stumped we had an 03 zr-2 s-10 that would only over heat at highway speeds or pulling a tailier it was the radiator, we installed an after market rad on it and it over heated ever since installed a new dephi radiator and it hasn't over heated anymore __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

10-21-2012, 12:22 PM	#5
scotts62 One day... Join Date: Apr 2008 Location: Tuttle, Ok Posts: 9,243	Re: Ok im stumped Ok ill try that and see, thanks __________________ Scott 93 crew cab build Project 62



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