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short-throw dipstick
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Isn't that the water pump weep hole? If it's leaking from there, the water pump shaft seal has died. What brand of water pump did you have them put in, and what type of coolant?
 

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short-throw dipstick
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^+1, Gates pumps are still junk, long after Honda abandoned them due to excessive failure rate.

I would seriously caution against using parts store green...it's usually an old-school silicate coolant that doesn't play nice with aluminum engines. I do a helluva lot of timing belt jobs on Toyotas (each job includes water pump), and cars running green always have sediment coming out of the block drain, which is what you get when silicate coolants attack aluminum engine components. In fact, I'm in the middle of an '03 Sequoia today, and guess what I find in the thermostat housing, and guess what color the coolant was. Also, the OEM Aisin water pump I took off is 100K old and the shaft seal went, causing dripping out the weep hole like you have - non-spec coolants will accelerate this.

Suitable, spec coolant isn't expensive. Zerex Asian Vehicle Red is a great substitute for OE, and is cheap as hell at Walmart.
 

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cars running green always have sediment coming out of the block drain, which is what you get when silicate coolants attack aluminum engine components.
is that really so?
New G13 coolant has silicate and its used for all aluminium engines and its really longlife coolant.

Made to self destruct?
 

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short-throw dipstick
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is that really so?
New G13 coolant has silicate and its used for all aluminium engines and its really longlife coolant.

Made to self destruct?
Euro coolants are low-silicate and have different additive packages, not like old-school high-silicate green or universal yellow. G12, G12++, G13 have carboxylates, maybe that and whatever else they put in staves off problems, or maybe the low-silicate does, I'm not an expert (@tedmich). I use G48 in BMWs and Mercedes and I know that's a low-silicate coolant...the Zerex stuff says 5-year, but the official BMW stuff says max 2 years. I've just seen a lot of Toyotas and Hondas that had sediment and pitting after use of green coolant, even ones that were changed in regular intervals.
 

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イリジウム
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Are you still under warranty with the shop?

A new water pump and coolant, if the timing belt didn’t get wet. Looks like rust in the system killed the seal. Of course Gates pumps have a bad rap (I’m a big fan of their belts and hoses and newer OE timing kits with genuine bearings, but I don’t use their pumps which they decided to get into).

Ask the shop to put in an Aisin pump and Zerex Asian or Pentofrost A1 (Toyota Red) coolant. Zerex coolant is premixed, so any water flushed into the system will dilute the ratio, if you flush you have to use a concentrate.

Makes me wonder if the shop got the ratio right last time. It’s too soon to have corrosion with new coolant last year.

In your case get full concentrate and distilled water (Rockauto has Pentofrost A1 concentrate $20/gallon) . I think the cooling system could use a flush with Prestone radiator cleaner (find at Walmart). Make sure to flush the chemical all out or you’ll have faster corrosion.

I don’t use the red Asian Prestone coolant - it’s just a Dexcool clone (sebacic acid and 2EHA last checked) with red dye, unlike the good Zerex Asian or Pentofrost.

Imo Prestone coolant is a real joke. Besides their radiator flush (only brand around it seems) I wouldn’t use any of their stuff.

2000 Camry 4 banger. Finally found my coolant leak. Had a front main seal go bad last year. Had a mechanic replace water pump, timing belt, and front main seal. Not sure what else was done. It’s the orange spot in the circle. What is this and how hard is it to fix? Thanks for any help.
 

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イリジウム
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That’s the Supertech Dexcool clone. Members have used it (and Prestone all makes), and in most cases seemed to be fine. But I stick with the Red!
 

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short-throw dipstick
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Walmart 5 year green. Never a problem.
This is good data, changed every 5 years?

That’s the Supertech Dexcool clone. Members have used it (and Prestone all makes), and in most cases seemed to be fine. But I stick with the Red!
Hm, I gotta start asking and tabulating what customers have used in the past, now I really want to get to the bottom of this.

EDIT: I remember doing intake manifold gaskets and finding pitting on the heads on several GMs, there was a TSB for that IIRC, attributing it to Dex-Cool.
 
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