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Old 02-01-2018, 06:06 PM   #1
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Default 150k coolant change - what else?

I'm coming up on 150,000 miles on my '03 T1N, so I'm going to change the engine coolant as recommended by this maintenance schedule. I'm also going to replace the serpentine belt and alternator pulley (I sometimes hear a high-pitched 'chirp' when shutting off the engine). While I'm in there, what else should I replace as preventative maintenance? Some contenders:
main water pump
belt tensioner
idler pulley(s)
fan clutch
coolant hose(s)
I would say the cooling system is working properly, although I've had one experience driving I-15 toward Las Vegas last summer, 100 outside, front and rear A/C on, the temp needle got very close to the red zone on the climbs. Turning off A/C kept it under control. I know the electric coolant pump has failed (doesn't come on with REST function), so I'll be replacing that as well.
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Old 02-01-2018, 06:15 PM   #2
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Default Re: 150k coolant change - what else?

Do a "B" Service?


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Old 02-02-2018, 06:22 PM   #3
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Default Re: 150k coolant change - what else?

I think that's just for the 2nd gen. the form says MY2015.

Anyone have an opinion on replacing the water pump specifically?
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Old 02-02-2018, 06:43 PM   #4
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Default Re: 150k coolant change - what else?

I actually recommend a full cooling system change at 100K. Everything but replace the radiator unless theres an obvious need.
Water pump, fan, fan clutch, serpentine belt, pulleys, belt tensioner, thermostat, coolant and any suspect hoses. While you have the radiator swung away and access to everything, it's a good time to take care of it all so there are no surprises down the road. Can those items last longer than 100K? They sure can. But 100K is what I have seen recommended and what I recommend to keep my customers' vans on the road and out of my shop prematurely.
Also, dont' forget the transmission service! If you didn't change the fluid, filter, pan seal and electrical socket at before now, it will need a full pan/valve body dissasembly and cleaning to get it back to its proper functioning.
*as far as the water pump goes, I have seen them start leaking as early as 120K and others that have gone 200K+. It's a gamble and a HUGE pain to replace them when you aren't ready.
Again, if you already have the radiator swung out and away, everything in there is easy to get to and replace. Just do it once, as long as you have the cash and the time.
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Old 02-02-2018, 06:58 PM   #5
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Default Re: 150k coolant change - what else?

Quote:
Originally Posted by bcman View Post
I think that's just for the 2nd gen. the form says MY2015.

Anyone have an opinion on replacing the water pump specifically?
I respectfully disagree. Preventive maintenance applies to all vehicles regardless of make/model year. Besides, majority of the items on a "B" service are visual inspections.

Last edited by Bobnoxious; 02-02-2018 at 07:07 PM.
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Old 02-02-2018, 07:20 PM   #6
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Default Re: 150k coolant change - what else?

Here you go, 2005 service manual 8th from the top. Can't be much different then a 2003. Refer to maintenance section. 15-year-old vehicle? I'd change the radiator much cheaper than a tow.


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Old 02-02-2018, 09:04 PM   #7
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Default Re: 150k coolant change - what else?

Your chirp is probably telling you that the alternator free running clutch is no longer up to spec.

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Old 02-02-2018, 09:12 PM   #8
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Default Re: 150k coolant change - what else?

'03 is OM612:

High pressure pump rebuild
pressure control valve new seals
maybe clear fuel lines, especially if the Voss connectors are damaged
Check crankshaft sensor - only in the sense of making sure that it will come out in the event that it fails at an inconvenient time
Clean the radiator fins on the whole cooling package (coolent, AC, transmission and steering)

Last edited by hkpierce; 02-02-2018 at 09:18 PM.
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Old 02-03-2018, 10:02 AM   #9
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Default Re: 150k coolant change - what else?

I would also recommend what Type2Teach and hkpierce are recommending. You may also want to replace the viscous fan clutch, especially if you're experiencing "unusual" heat build up on up hills. And certainly try your best to clean out any build up of crap between the radiators...seen some nasty pictures here on the forum.

I have an 04, so not the same, but I had to replace my water pump at 170k. I then replaced my viscous fan clutch a year later. AND THEN at 200k just recently had to pull the high pressure fuel pump to re-tighten the bolts holding it together--different design than 03, but similar problem. If I had known these were all issues, I might have just done it all at once since it all involves getting in the same area with the fan off. It's not hard, just annoying to get in there.
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Old 02-03-2018, 12:06 PM   #10
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Default Re: 150k coolant change - what else?

It is my understanding over time, radiator's cores become clog from the center radiating out. Have the radiator BOILED AND RODDED.
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