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2003 EXT / 1976 Eldorado
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Discussion Starter #1
I just noticed a tablespoon size puddle of coolant under the truck. 2003 EXT with 91k miles. It has the original water pump as best I can tell and that seems to be where the coolant is coming from. I am going to replace the thermostat while I am in there and also the smaller belt for the A/C. The main belt looks new (I have only had the truck for a month) so I am going to leave it be. While I am under the hood, I will also do plugs and wires. I sometimes get a rough patch or stumble while idling.

Anything else that I should replace or evaluate while I am at it. If there are parts that are known failures, I would rather replace them on my schedule versus having them fail while on the road. I did a search and saw where some replace the idler pulley and tensioner, but is that needed? I plan on owning the truck for another 100,000 miles and want it to be reliable.
 

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03 cadillac escalade
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11,902 Posts
90limited said:
I just noticed a tablespoon size puddle of coolant under the truck. 2003 EXT with 91k miles. It has the original water pump as best I can tell and that seems to be where the coolant is coming from. I am going to replace the thermostat while I am in there and also the smaller belt for the A/C. The main belt looks new (I have only had the truck for a month) so I am going to leave it be. While I am under the hood, I will also do plugs and wires. I sometimes get a rough patch or stumble while idling.

Anything else that I should replace or evaluate while I am at it. If there are parts that are known failures, I would rather replace them on my schedule versus having them fail while on the road. I did a search and saw where some replace the idler pulley and tensioner, but is that needed? I plan on owning the truck for another 100,000 miles and want it to be reliable.
I suggest doing both belts and tensioners as I did my ac belt and tensioner only to find the main belt needed replacing also and I think I need new plugs and wires soon as I have 158,000 roughly on my truck and it don't idle smooth

I haven't had a problem with the idler pulley so far but I keep a check on this for any noise which is a sign the bearings are worn(that was what was wrong with mine on the tensioners)
 

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2003 EXT / 1976 Eldorado
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184 Posts
Discussion Starter #3
can you buy just the thermosat $5.50 or do you need to get the one that includes that housing $15.00.
 

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'05 ESV Platinum, 250,000 still looking fine, really fine!
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90, that was me that replaced the idler and belt tensioner when I did the water pump a few months ago. Its up to you as far as what you want to replace but for a couple of more bucks I like the preventative maintenance route. BTW I had somewhere around 162k on the clock when our (original) water pump went, so that why I replaced all the front end of the motor stuff.
 

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2003 ESV
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326 Posts
Clean the throttle body. That is most likely the cause of the rough idle or stumble. At least it is very cheap to do and will rule it out.
 

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03 cadillac escalade
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11,902 Posts
smelly$cat said:
Clean the throttle body. That is most likely the cause of the rough idle or stumble. At least it is very cheap to do and will rule it out.
I replaced my throttle body not too long ago and yet my truck still idles odd I am going to put new plugs in as I don't know when they(or if) they were replaced
 

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08 Escalade ESV awd, 05 Yukon Xl Denali awd, 06 SRX sold
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the cadillac man said:
I replaced my throttle body not too long ago and yet my truck still idles odd I am going to put new plugs in as I don't know when they(or if) they were replaced
Dont forget the idle learn procedure as well
 

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2003 Escalade AWD 6.0L
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I have a 2003 that was a little rough in running and seemed a bit short on power. When I pulled the plugs I was horrified with what I saw. On every one of them the center electrode was so worn that it looked like a broad dome instead of a nice little point. I replaced those, the wires, and the ignition coils. I noticed an instant improvement in engine power and the idling was smooth. The truck will now push me back in the seat when I floor it. Such a good feeling!

My Escalade has 213,000 miles on it, but i have no idea if the plugs have ever been replaced.
 

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03 cadillac escalade
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Airdorn said:
I have a 2003 that was a little rough in running and seemed a bit short on power. When I pulled the plugs I was horrified with what I saw. On every one of them the center electrode was so worn that it looked like a broad dome instead of a nice little point. I replaced those, the wires, and the ignition coils. I noticed an instant improvement in engine power and the idling was smooth. The truck will now push me back in the seat when I floor it. Such a good feeling!

My Escalade has 213,000 miles on it, but i have no idea if the plugs have ever been replaced.
You describe how my truck is doing exactly (after I get my shocks replaced I am getting a set of new plugs (do I need really need new coil packs? The truck don't throw any codes for them)
But my 03 is like a dog compared to the 02 that my dad got lately(and it hauls butt almost like new)
 

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2003 Escalade AWD 6.0L
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You describe how my truck is doing exactly (after I get my shocks replaced I am getting a set of new plugs (do I need really need new coil packs? The truck don't throw any codes for them)
But my 03 is like a dog compared to the 02 that my dad got lately(and it hauls butt almost like new)
Only reason I replaced my coil packs is because I had a weird power loss problem once not long after I got it and I panicked. So I threw a little bit of $$ at it and bought plugs, wires, and coil packs.
 

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03 cadillac escalade
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Airdorn said:
Only reason I replaced my coil packs is because I had a weird power loss problem once not long after I got it and I panicked. So I through a little bit of $$ at it and bought plugs, wires, and coil packs.
Ok I will get new plugs and wires after I get my rear shocks took care of
 

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03 cadillac escalade
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Pitbull14218 said:
You're just talking about the ECM needs to relearn how to idle after having the battery disconnected?
You have to do that when you replace certain things ( replacing the battery makes the PCM do the relearn) but I am replacing the spark plugs and will be doing the relearn afterwards(to be sure it idles smooth)
 
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