2004 Silverado running to cold??????
#1
2004 Silverado running to cold??????
Here is something that has VERY confused, here is the info first:
2004 Silverado 1500 4x4 Z71 5.3L 240,000 miles
Yesterday, went out of town to visit family 6 hours away, I had it on cruise control at 75. About 4 hours into the trip, the engine like "stalls", but it did like a fast stop and start. I started looking at my gauges and notice that my temperature was below 210.
I started watching it and noticed it would go up and down and when it would hit 160, the engine would like "restart" and the temperature would shoot back up to normal at 210.
So then every time I would see it go down, i would let go of the gas and it would crawl up to 210 again.
Has anyone seen this before? water pump AND thermostat were replaced 2 years ago when it had 192,000 miles. The truck is not overheating. The temperature was 41 degrees outside, could it be that the fan clutch won't turn off? water pump not flowing water?
I've never seen this before, I am at a loss here. I have included the pictures when the temp started to go down and another back to normal.
2004 Silverado 1500 4x4 Z71 5.3L 240,000 miles
Yesterday, went out of town to visit family 6 hours away, I had it on cruise control at 75. About 4 hours into the trip, the engine like "stalls", but it did like a fast stop and start. I started looking at my gauges and notice that my temperature was below 210.
I started watching it and noticed it would go up and down and when it would hit 160, the engine would like "restart" and the temperature would shoot back up to normal at 210.
So then every time I would see it go down, i would let go of the gas and it would crawl up to 210 again.
Has anyone seen this before? water pump AND thermostat were replaced 2 years ago when it had 192,000 miles. The truck is not overheating. The temperature was 41 degrees outside, could it be that the fan clutch won't turn off? water pump not flowing water?
I've never seen this before, I am at a loss here. I have included the pictures when the temp started to go down and another back to normal.
#2
CF Active Member
Your Thermostat is sticking.
Just because it was replaced a couple years ago doesn't mean it won't malfunction...Also looks like the wrong one was installed.
Should be a 195* degree thermostat and if your gauges are reading correct it looks like you got a 205* thermostat...or it is sticking closed and sticking open.
The 40* ambient temps at freeway speeds will reveal any flaw with the Stat trying to do it's job.
Additionally,the Computer is "seeing" these temp fluctuations and probably going from closed loop to open loop repeatably and freaking out trying to stay running correctly.
Just because it was replaced a couple years ago doesn't mean it won't malfunction...Also looks like the wrong one was installed.
Should be a 195* degree thermostat and if your gauges are reading correct it looks like you got a 205* thermostat...or it is sticking closed and sticking open.
The 40* ambient temps at freeway speeds will reveal any flaw with the Stat trying to do it's job.
Additionally,the Computer is "seeing" these temp fluctuations and probably going from closed loop to open loop repeatably and freaking out trying to stay running correctly.
Last edited by 67Motorcat; December 28th, 2012 at 6:09 PM.
#3
I will replace thermostat
Thanks for the info, I will replace it, this makes sense.
I looked at the thermostats and see two different ones:
1. OE recommended is 187 degrees AND
2. Alternate Temperature 160 Degrees Fahrenheit
Which one of these do I need? The 187?
I looked at the thermostats and see two different ones:
1. OE recommended is 187 degrees AND
2. Alternate Temperature 160 Degrees Fahrenheit
Which one of these do I need? The 187?
Last edited by jamesdal7; December 29th, 2012 at 1:55 AM.
#5
new bolts?
where can i get longer bolts? the threads in the beginning are gone, but towards the back, they still grip, but i need longer bolts, any recommendations? or do i need a "tap" thread maker?
#6
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Join Date: Jul 2012
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First thing I would check is the coolant level. I had a similar problem and I was low on coolant.( I have the same truck)
As far as the threads...............if a longer bolt wont work, then you need a heli-coil kit. They work great.
As far as the threads...............if a longer bolt wont work, then you need a heli-coil kit. They work great.
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#8
new thermostat in
OK, got a helicoil and fixed the threads. new thermostat is in, drove around town and got on the highway for about 15 miles. Temperature did not budge from 195. I will travel back Wednesday, a 6 hour trip, I will report if all went good or not.
#9
CF Senior Member
I don't know if it is possible on newer vehicles, but it was not uncommon for drivers of 1970s GM vehicles to install the termostat upside-down. I doubt that is your problem, but it might be worth investigation.
More likely than not, you do have some kind of thermostat issue.
More likely than not, you do have some kind of thermostat issue.