Question about 2005 Chevrolet Silverado

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05 Silverado, overheats when in 4-wheel drive under strain. Fixed once(so I thought) by replacing the water pump and thermostat. Happened a few months later. Again, 4-wheel, under strain. Wound up replacing heads also. Now can't drive anywhere without overheating. Have determined the fan is not coming on until it is past 210 degrees( too late I think) and by this time it wont cool it down. I'm thinking something in electronics. Can this cause me to overheat if a sensor or module is out? Told it is not showing anything on computer now, but it has not been to a pro shop. Oh yeah, now the overheating is during normal anytime driving. Still thinking fans but really stumped.

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  • Chevrolet Master
  • 11,022 Answers

Instrument cluster - GM had problems with a part inside the cluster , Stepper motor , These faulty step motors caused the gauges to act erratically . 2003 to 2006 ! ALL GM vehicles . Just replaced a cavalier instrument cluster for what customer thought was a over heating problem .The fans come on low speed when engine temp. reaches 220 degress
The PCM commands the low speed cooling fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 104.25°C (220°F).
• A/C refrigerant pressure exceeds 1447 kPa (210 psi).
• After the vehicle is shut OFF if the engine coolant temperature at key-off is greater than 101°C (214°F) the low speed fans will run for a minimum of 60 seconds After 60 seconds, if the coolant temperature drops below 101°C (214°F) the fans will shut OFF. The fans will automatically shut OFF after 3 min. regardless of coolant temperature.
The PCM commands the high speed fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 107.2°C (225°F).
• A/C refrigerant pressure exceeds approximately 1824 kPa (265 psi).
• When certain DTCs set.
At idle and very low vehicle speeds the cooling fans are only allowed to increase in speed if required. This insures idle stability by preventing the fans from cycling between high and low speed.

Posted on Mar 31, 2017

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Posted on Jan 02, 2017

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SOURCE: cooling fan not coming on. 1985 chevy cavalier 2.0L

I'm not familiar with your exact car but a friend of mine had a similar problem the solution was to replace the electrical relay for the cooling fan. Consult a wiring diagram to see if there is a relay (there should be) and replace it.

The other possibility off the top of my head is a short in the wiring somewhere. Power the fan directly and ensure it works fine. If the fan is OK then the problem is likely in the wiring or wire connectors somewhere. That should help narrow down the problem. Good luck!

Posted on Dec 14, 2008

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SOURCE: cooling fans not working on 1995 camaro z28

you have a burnt fan relay...if it were my car i ould run a jumper to the fuse panel so that when you turn the key on the fan will also come on and run.its not hard to do and it will stop the car from overheating

Posted on Jan 24, 2009

  • 38 Answers

SOURCE: 2003 impala is it a temp sensor or cooling fan switch

Maybe your radiator is clogged flush it out.

Posted on Aug 11, 2009

  • 176 Answers

SOURCE: i have 04 chevy blazer v6,was overheating,I 1st

I hate when this happens, had it happen to me also on my Silverado, I bet you didn't change out the sending unit, if that doesn't fix it, you have to remember that just because a thermostadt comes in a box that says it's new...it's a man made object..even the new can be broken.

But, I'd go with the sending unit first.

Thanks for letting www.FixYa.com , fix ya


Terry

Posted on Sep 03, 2009

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SOURCE: My 99 Cavalier keeps steaming and overheating. I

90's Cavaliers are notorious for problems such as these.

I hate to be the barrier of bad news, but in this case I would suggest that your engine either has a blown head gasket, and/or a warped head.

There is also the possibility that you blew a "soft plug" or cracked the block and that the coolant is leaking out through the base of the engine.

To find out of you have a blown head gasket, you can remove the oil cap from the valve cover and inspect it. If it has a yellow-brown-ish goo that is the consistency of paint, then you definitely have a blown head gasket and coolant has mixed with your oil. Meaning that you likely need an overhall.

You can also check by removing your radiator cap and checking to see if little tiny bubbles come up while the car is running. That is a sign of a compression leak, meaning that you most likely have a crack somewhere in either the cylinder head or the block.

Also, those cars have many very small radiator hoses that are in the middle of the engine and hard to see, find or replace.

In this instance, it sounds like your car has over heated more than 4 times, and once you get to that point you are likely to have fried the engine. This is because the newer engines are mostly aluminum and can't stand that much heat that often.

I would suggest seeking either a new car, or seeking a used engine to replace in your car. A used engine for those is fairly cheap compared to the price of fixing the problems that are likely to have occurred from excessive over heating.

Posted on Nov 11, 2009

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