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Worried about engine temp

jdelrizzle

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suprdav2 Enthusiast

suprdav2

Posted
Posted

I have a 2007 4.8 that I noticed doing the same thing the other day while waiting in a long line at school to pick my kids up. It's the ONLY time I have noticed it do that. Engine temp got up to about 230, then I would hear the fan kick on, and it would go back down to 210. Same thing with the tranny temp.

jdelrizzle Enthusiast

jdelrizzle

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I spoke to the dealer (haven't gone in to get it checked out made an appointment ) they told me it was normal, I'm about to take in for the second time (different dealer), but like yours it got to about 220 and very quickly got back to 210, I guess my best bet would be to get an external Trans cooler, that way the Trans fluid would be taken away from the radiator.

GPSilverado Enthusiast

GPSilverado

Posted
Posted

Unless things have changed in the last few years, the transmission lines do connect to the radiator, even with an external cooler. The external cooler is an auxiliary cooler.

 

My tansmission has never reached 200 degrees, even towing a 6500lb boat in 95 degree weather. I will say though, I haven't let my truck idle that long either.

jdelrizzle Enthusiast

jdelrizzle

Posted
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My friend has a 2010 Silverado sL 4.8 very similar to mine and I helped him install his external cooler, the tranny lines connect to the radiator, top and bottom, the cooler sits inside the radiator, it's in there with all the coolant. As far as the idling, you maybe on to something, this is my first brand new vehicle and I've never been one to let my vehicles idle for so long.

txab Senior Enthusiast

txab

Posted
Posted

Auxiliary coolers are installed in series with the cooler that is in the radiator. You can have your fan activation temperature adjust lower if needed

markw8 Enthusiast

markw8

Posted
Posted

Looking at my 08 FSM the low speed fan comes on at @220F or the ac refrigerant pressure exceeds 210psi. The high speed fan comes on @225F. Remeber the OP is talking long idle times. No air moving unless the fans are on.

 

Mark

jdelrizzle Enthusiast

jdelrizzle

Posted
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^thats good stuff, how would you adjust your fan activation? Can the dealer do that? You can also by pass the radiator all together, but I hear that's not recommend.

jdelrizzle Enthusiast

jdelrizzle

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Posted

Markw8, so that's what the factory service manual says, makes since. I guess I'm just jumping the gun.

txab Senior Enthusiast

txab

Posted
Posted

^thats good stuff, how would you adjust your fan activation? Can the dealer do that? You can also by pass the radiator all together, but I hear that's not recommend.

 

Some aftermarket tunes can adjust the setpoints. Doubt if the dealer will make a change.
travis73 Enthusiast

travis73

Posted
Posted

I use mine for reading meters so it sits idling all the time,they have to rely on the fans to get the air moving,your tranny temp and engine temp will climb a little in these situations.It is perfectly normal,my tranny temp sometimes climbs to 200 and the engine temp will go up a little untill the fan or fans kick on and quickly bring them back down.I think your dealer is correct in saying it is normal.I would not worry these trucks will tell you in the DIC display if something is overheating and will cut engine power untill it is resolved.

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