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I would just go with the directions on the flush bottle.Due to not knowing the age of the current t-stat, I would go ahead and replace it with a new Toyota one, and not a parts store one, most end up with coolant temp issues running a parts store t-stat.
I just spent a week flushing out the cooling system on a Ford Focus..............First 3 flushes I captured and just did a idle warm up. (Then took anti-freeze to hazardous waste)Then I'd fill with water, drive a day, drain at night; for 3 days. (I'd just dump the 'water' on a bush)Then I added the flushing chemicals and did 4 hours of driving.Then 4 more water flushes.Then compute how much full strength anti-freeze I need to get 50/50 mixture given cooling capacity. (there's always water left in the block, so 50/50 will be diluted). Top off with water.
models? Also mine has the paper gasket so do I need to just order that gasket or will I also need to order the rubber as well?
It looks like Toyota offers just the one now, 90916-03078 replaces 90916-03076, which I believe is the original part number for your '82.Based on the diagram here, it looks like your '82 uses both gaskets.https://toyotaparts.mcgeorgetoyota.com/oem-parts/toyota-engine-coolant-thermostat-9091603078$30+ shipped is about right from the dealer, I think I paid about $20 for just the T-stat alone for the last one I bought from my local dealer, and $4 for the rubber gasket. It looks like RockAuto now sells AISIN parts as well, might order one and see what it looks like.https://www.rockauto.com/en/catalog/toyota,1982,pickup,2.4l+l4,1277153,cooling+system,thermostat,2200
The first three flushes I take it you only used water?
YesLeave the thermostat in. Hot water cleans better. Flush with old thermostat (and water pump if you'll be changing that too)
Found the t-stat for $19 on Walmart.com, with free shipping.Not sure what issue the upgraded one is meant to resolve, haven't ever had an issue with the oem one in 115* CA valley heat or single digit temps in the winter, it looks like it has a mini-T stat built in.
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