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My new farm-fresh 2005 Chevy Silverado has obtained 130k miles and is in require of some coolant mechanism TLC. I made decision to go ahead and do a coolant flush. After ~ some virtual reading, I found that about 2 gallons of liquid is recovered after ~ draining (which then also needs to be replenished). This formed the basis because that my purchases. I gained 6 gallons the distilled water, 2 gallons that Dexcool (1 extra gallon pictured for various other use), 1 qt Prestone flush and also a brand-new thermostat. I likewise picked-up one antifreeze tester come ensure I’ve done it right.

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Step 1: drain the coolant. This is excellent by removing the reduced coolant hose from the radiator (passenger side). The share clamp is a pain to work-related with, yet doable v some channel locks. I had a large plastic container prepared to catch whatever flowed down.

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Be warned, this deserve to all be quite messy. When the gushing turned to a trickle, ns then eliminated the thermostat and also housing making use of a 10mm socket to eliminate two bolts holding that on. Together I walk this, a bunch an ext coolant started to leak out and once again gushed top top removing the thermostat. In ~ this point, every the coolant I can remove has actually leaked out. Onwards…

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This just shows after having actually removed the thermostat and also housing. Notification the black color gasket product still grounding to the manifold… this will must be cleaned off before installing the new thermostat (to be done last).

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The fruits of my labor thus far. Around two gallons worth of fluids. The color is in reality not too bad, yet we did recently add about 1/2 gallon of Dexcool and fresh water due to the coolant being so low (due to some various other undiagnosed leak… to be tackled later).

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I left the thermostat linked to the reduced coolant hose. The goal here is to leave the housing connected, however remove just the thermostat. This will allow the coolant to circulation through the whole system the moment the engine is running, quite than having actually to wait 10+ minutes because that the fluids to get up to temperature. The thermostat will stay out of the system until I’m all set to do the last fill.

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Here’s a clear watch of the thermostat. It can be removed just by pulling it out. That took virtually no effort at all.

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Once the thermostat is out, I very closely removed the rubber gasket in ~ its base, then placed it ago into the thermostat housing. Without the gasket going earlier on, it would certainly leak.

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Here is the gasket installed ago into the housing, all all set to go.

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The following step to be to hook everything ago up and pour the Prestone do the washing up solution into the overflow container, then filling the mechanism using two entire gallons that distilled water. You have the right to use insanity water at this point, yet our water is so difficult here, plus ns was buying distilled water anyway, i just got a couple extra gallons and avoided insanity water all together. Next, v the overflow cap still off, I started the engine and also ensured the device was topped-off, then put the cap back on and ran the engine for 20 minutes. While ns was waiting, ns poured the an initial two gallons of drained coolant into the two currently empty gallon jugs for proper disposal.

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After around 20 minutes, my temp gauge verified the engine hadn’t also gotten approximately the typical operational temp (just listed below 210). But, this is normal and not an issue.

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I then drained the device again, refilled it through two an ext gallons that distilled water add to a bit more from a third gallon, climate ran the engine for one more 20 minutes. At this point it was getting later and also the sun had currently set, temperature was dropping. Out come my job-related light. Oh, and also it was beginning to rain. Yay.

The water to be drained out, completing the last drain for this flush. I gotten rid of the thermostat real estate again and removed the real estate from the hose this time. Brand-new thermostat+housing installed. Every little thing put ago together and also I poured in 2 gallons that Dexcool (yes, you desire a 50-70% Dexcool-to-water ratio, however with all the undrainable water in the system, at the very least 2 gallons worth, i would finish up with the preferred ratio). The engine to be started and I topped it turn off with few of the remaining distilled water.

Done!

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The next day i tested the coolant through the antifreeze tester i got. Every looks good! The yellow arrowhead points to the indicated measurement.

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Now to track down that coolant leak… (I would have actually done that first, however below-freezing temps space upon us).