Question about 2003 Chevrolet Silverado 1500

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2003 silverado z-71, overheats when i'm towing normally runs about 210 but when i have a trailer it runs to 250 and even 260.

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Install a transmission cooler, it may help

Posted on Aug 25, 2010

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Have a 2003 silverado everything works hooh a trailer up and signal lights won't work even tow lights with magnetic bases that work with other trucks won't work with mine


check the wiring in the trailer connection as they tend to corrode off the copper wires or the wires tend to get pulled out on disconnecting

Mar 15, 2014 | 2003 Chevrolet Silverado 1500

3 Answers

Tail lights on trailer not working f250


did you check the trailer /tow fuse under hood in truck? located lfet side rear near firewall top. should be fuse for towing / trailer.DW Mylin

Dec 01, 2012 | 2008 Ford F 250 Super Duty 4WD

1 Answer

My 2001 2500HD Silverado overheats while towing my travel trailer when crossing mountains. I was told that you can install a "remote" add-on electric fan that has a switch in the cab. When the...


in some cases yes. also you can get a lower temp thermostat that keeps the motor
running at lower temperature also i would check to see at wat temp the fan comes
on that is ware you start. the heavy load will always run your temp up higher

May 29, 2011 | 2001 Chevrolet Silverado 2500HD

1 Answer

I have a 2003 ford F150 and I bought a factory plug in trailer harnes but the only light that work now is the running light I got back under truck and tried the harnes with a tester and it seem the trailer...


The fuses for the trailer tow adapter are in the normal fuse panels.

Engine Compartment fuse panel
101 - Is the battery charge circuit ( hot in run position )
20 - Left Stop / Turn fuse
19 - Right Stop / Turn
5 - Trailer tow reversing lamps & Trailer Tow parking lamps

Cab Fuse Panel
23 - fuse for the relay for the trailer tow battery charge circuit

All of these are in the owners manual

If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

Oct 04, 2010 | 2005 Ford F-150

1 Answer

2000 Chevy Silverado normal operating temp is 210 , recently temp rises to 250. Its been this way for a few days, common operating temp is around 240-250 now, but does not overheat. Coolant levels are...


250 TOO HOT FOR ENGINE AND TRANSMISSION. SOUND LIKE COOLING FAN CLUTCH BAD ITS FREEWHEELING NOT LOCKING UP TO DIRECT DRIVE TOO COOL ENGINE OFF BECAUSE THE FAN CLUTCH THERMOSTAT NOT WORKING THE HOT SILICONE OIL CAUSE IT TO EXPAND TO PUT RESISTANCE ON CLUTCH TO PUT DRAG ON FAN CLUTCH CAUSING IT TO LOCK IN GIVE IT DIRECT DRIVE.I WOULD STILL REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP IF TEMPERATURE STILL 250 DEGREES YOUR RADIATOR AND COOLANT SYSTEM NEED FLUSHING.

Aug 17, 2010 | 2000 Chevrolet Silverado

1 Answer

Brake lights


If you have an aftermarket trailer towing plug on it, that's where i would look first. Something is shorting out in there, or you have a broken wire or ground somewhere. Proabably near the back where gravel stones can hit.

Oct 07, 2009 | 2003 Chevrolet Silverado 2500HD

2 Answers

I have a 2003 Silverado Z-71 4 wheel drive. When towing trailer in 2 wheel drive and the "tow" switch is engaged it does not seem to make any difference in the way the transmission shifts. If the...


When you engage the "tow" button, all that does is stop it from going into overdrive and putting a strain on the clutch packs inside. The transmission shifts the same whether its towing or not.

Jun 22, 2009 | 2003 Chevrolet Silverado 1500

1 Answer

2000 chevy silverado normal operating temp 210 , recently temp rises to 250. water pumps no leaks therm. appears OK .


With the truck running at operating temperature, squeeze your upper radiator hose. You may have to check it a couple times allowing time for your thermostat to open. Are you able to compress the hose a little when you squeeze it or does it remain stiff/solid? Your thermostat may be stuck open or even stuck closed.

Jun 10, 2009 | 2000 Chevrolet Silverado

2 Answers

Trailer towing fuses


Battery junction box (BJB) fuse(s):
  • 5 (30A) (trailer electric brake controller)
  • 34 (25A) (trailer tow turn relays)
  • 42 (30A) (trailer tow parking lamps)
  • 44 (30A) (trailer tow battery charge relay switch side)
  • 63 (15A) (trailer tow reversing lamps

Mar 20, 2009 | 2008 Ford F 250 Super Duty 4WD

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