Medium and Heavy Trucks

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Related Medium and Heavy Trucks Questions
I have a 1996 model 379 peterbilt with a cat 3406e in it.
I have a 1996 model 379 peterbilt with a cat 3406e in it. The cruise control has started not working intermittently. I thought it had to be the on/off switch so I changed it and it still does the same… read more
BrentR718
BrentR718
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Cummins x15 runs hot loaded never gets below 200 unless on
Cummins x15 runs hot loaded never gets below 200 unless on down hill grade … read more
cumminsdr
cumminsdr
Mechanic
High School or GED
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I got a 3406E with a 208 thermostat and its been about
I got a 3406E with a 208 thermostat and its been about 80s-90s and temp has been running 205-210 and fan hasnt been kicking on till 212-213 and was wondering if that was normal or bad sending unit or … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,220 satisfied customers
I have an O7 Freightliner where is a C15 acert twin turbo at
I have an O7 Freightliner where is a C15 acert twin turbo at 475 horse I've driven it over 300,000 miles recently I had an overheating issue and it cos they had to crack and I had it in the shop and I… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,220 satisfied customers
2207 Pete w/ 2006 ISX 475.. 2007 Pete 386 W/2006 ISX 475.
2007 Pete 386 W/2006 ISX 475. After warming up truck and driving 3 miles empty truck will heat u to190. When arriving to get loaded after 3 miles and While idling it heats up to 200.. Sometimes drops slowly to 195 sometimes fan has to kick on. Once loaded and I drive maybe 2 blocks at 20 miles an hour heats up to(###) ###-####and fan kicks in and brings temp down will do this non-stop until I hit highway. Once on highway after another climb of to 200-205 I can drive for about 3 miles and temp will come down to 180 maybe even 175 by itself... As soon as I get off highway and start slowing down. Temp will start to rise all over again... NOW! Even when empty sitting still temp will be 180 and I start driving temp climbs right away.. even on Highway empty it will do same thing as when loaded.. I did not think that my temp should climb while empty.... If I ride empty or loaded with a/c on temp never moves it stays 180-193.. Cooling Fan cycling maybe every couple of minutes... I have new clutch fan, new coolant, new therm, new low temp sensor and new temp sensor new EGR.. Let me add... I have never seen temp drop by itself with out assistance of fan or driving 70. miles hour down highway... I fill tank until it is past glass. and never have to add.. but lately I have been filling to very top and it will kick it out of overflow until it is above sight glass... Radiator need to be purged? Clogged Radiator Fins? New radiator? No codes … read more
Eddy
Eddy
HD Truck Tech
GED
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I have a 2003 379 c15 6nz. My oil tempos at 220 with a new
I have a 2003 379 c15 6nz. My oil tempos at 220 with a new teltek gauge and sensor. My water temp shows around 220-225 when working the motor is working hard. I thought it sounds high. Have new thermo… read more
Cat Man
Cat Man
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Vocational, Technical or Trade Scho
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I have a cat mbn 525 hp c15 and engine fan is not coming on
i have a cat mbn 525 hp c15 and engine fan is not coming on by itself . it will come on with manual switch and with a/c . tested harness and have 4 volts at sensor and also replaced sensor . also have… read more
Cat Man
Cat Man
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Vocational, Technical or Trade Scho
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Have a 2017 International Prostar VIN 3HCDJAPR7JL528506 with
have a 2017 International Prostar VIN 3HCDJAPR7JL528506 with an ISX15 Cummins in it.... driver is telling me this winter it normally ran around 210-215 degrees,, on warm days it jumps to 230 then drop… read more
Wayne
Wayne
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Vocational, Technical or Trade Scho
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I have a 2009 cascadia dd15, temp,. fan comes on at 220
i have a 2009 cascadia dd15, hi temp,. fan comes on at 220 -225 replace coolant 2x in a week, water pump, water temp sensor, fan sensor solenoid, thermostat all this in one week, and still fan wont st… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
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Freightliner fl 112 is overheating changed thermostat changed
Freightliner fl 112 is overheating changed thermostat changed coolant fan seems to be blowing fast from moment I turn truck on but doesn't seem to be cooling engine down… read more
Roy Belding
Roy Belding
7,517 satisfied customers
I have a 1996 cat engine 5ek51876 3406e engine fan does not turn on @ hig temp.ECM is
HI I have a 1996 cat engine 5ek51876 3406e engine fan does not turn on @ hig temp.ECM is on. no signal from ecm to fan solenoid.Wand works with a/c on and manual switch. high temp blew head gasket can… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,220 satisfied customers
i have a acat engin ser no mxs48916 when it reatch 220 the
i have a acat engin ser no mxs48916 when it reatch 220 the fan clutch dont kick in in when i go down hill the fan clutch dont kick in when i start the ac the fan clutch kick in in i change the intake … read more
Cat Man
Cat Man
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Vocational, Technical or Trade Scho
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Hi I'm Bob. I have a 2005 FREIGHTLINER Columbia WITH A 7.2
Hi I'm Bob. I have a 2005 FREIGHTLINER Columbia WITH A 12.7 DEISEL ENGINE. THE AC SYSTEM CYCLES FROM HOT TO COLD ON ITS OWN CYCLES… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
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Hey spanky, I am working on a 2001 volvo vnl air conditioner
Hey spanky, I am working on a 2001 volvo vnl air conditioner system, the compressor will cycle on and shuts off at 250 lbs head pressure. takes forever to come back on i have replaced both the pressur… read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
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i have a 1988 fld freighliner 3406 cat model need ans. on
i have a 1988 fld freighliner 3406 cat b model need ans. on temp sensors that control fan cluth . what do all the wires control on the swith with 2 termial that set on top side of thermostate housing?… read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
420 satisfied customers
1999 international 4400 low pro 4 door hauler e530 engine
1999 international 4400 low pro 4 door hauler e530 engine towing a load constant temp of 210 fan kicks in every 1/4 mile changed radiator, water pump, thermostat any suggestions… read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
420 satisfied customers
hi, my name is XXXXX XXXXX recently did a engine swap with a 3406e
hi, my name is XXXXX XXXXX recently did a engine swap with a 3406e cat from a 98 international to a 97 pete, I reused my old ecm with the international harness left untouched, everything works great, … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
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I have a series 60, 2002 egr equip. Pierce fire engine. ddec
Hi, I have a series 60, 2002 egr equip. Pierce fire engine. ddec 5. it has an over heat condition. Situation, idle is fine, fan clutch (air) works with override controls via pump engage and hi-idle sw… read more
FIX-IT
FIX-IT
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Vocational, Technical or Trade Scho
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Meet the Experts:

Daniel Wilson

Daniel Wilson

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Owner at DJ Wilson

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Cat Man

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I am ASE Master Truck Certified.

Wayne

Wayne

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worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

Certified Truck/Bus Technician

2,740 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

cumminsdr

cumminsdr

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All types of Cummins applications

Curtis B.

Curtis B.

Technician

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Technician turned service manager on multiple lines of trucks and engines, used in industry.

Chris (aka-Moose)

Chris (aka-Moose)

Technician

353 satisfied customers

24 years of experience diagnosing & repairing

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