I'll be picking an OEM radiator today. That I reserved yesterday at my local dealership.
I also reserved: 2 jugs of red, upper & lower rad hose.
I've already have the newer OEM thermostat, Rad cap & inlet cap installed. Which I R&R last year. Due to pitting and aftermarket thermostat I found previously, while workout a running hot and other issue (created by another shop).
I'll also have on hand. A new front water bypass, it's two gasket and Throttle body gasket (98-05). As leak at upper hose to goose neck, indicates goose neck is very likely pitted.
Tip: Walmart has distilled water. Which become harder to find than OEM Radiators.
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A few points on Radiators & Coolant services & choices.
A) These days I use OEM radiators, even though we've some good aftermarket choices.
1) OEM hoses & clamps, fit perfect and never leak.
2) OEM comes with all foam air dams. This reduces labor/time to transfer foam to aftermarket.
3) High standard used in manufacturing.
B) I always "flush" by just draining Radaitor & both block drains, then blowing out engine and heater cores first. I've found I can get nearly 95% of fluid, out of the coolant system.
If I feel it warranted, I will triple flush 98-03 (which are years Toy LL Red recommended) with distilled water. Further more if I find it advisable, I'll flush with BG coolant flush, at start of service. Flushing with distilled water or chemicals, is best done while old radiator still in, in most cases (provided rad not full of crude).
In the 04- which Toyota recommends Toy SLL PINK, be flushed earlier of 50K miles or 5yr, I avoid any kind of water or chemical flush, unless condition warrant it. The reason is 04- call of premix Toy SLL PINK. Which Toyota recommends we not add water, as this alters the formula. In the cases I must chemical flush, I then must triple flush with distilled water afterwords. So I them recommend next 2 coolant services, be the soon of 2yr of 30K miles, as if a red had been used.
C) Can we mix PINK and RED? YES!, according to Toyota. But is a waste to do so. As once we mixed, we must use the more restrictive flush schedule of: earlier of 2 yrs or 30K miles. For at least next two flushes (drains).
Personally I like red the best.
First it lends itself to triple flushing with distilled water.
Second I find least damage to coolant systems, that use red. I can't say that it's due the difference in formula between Red & Pink, as IDK. But feel strongly that the more restrictive flush schedule, plays a big part of why.
D) I always replace upper & lower radiator hoses, thermostat and rad cap when replacing radiators. Unless I know they are relative new OEM already installed. If aluminum goose neck of inlet cap or water bypass joint damaged/pitted. I replace or resort them them.
Notes:
Triple Distilled water flush, if tap/river water ever put in system. Or concerns of aftermarket coolants used.
Chemical flush if excessive scale/hard deposit noted, or a stop leak add. This best done just before water pump replaced.
06-07. I work do a temp fix to front water bypass "joints'" goose neck. As they require intake manifold pulled, to remove joint.