Having problems with your 2000 Chevrolet Blazer ?
Has little heat could it be thermostat - 2000 Chevrolet Blazer
Would be a good place to start, as well as a flush, but if temperature gauge is reading the same as before, take a minute and check (by feel), the heater hoses going into the firewall, (careful may be hot) and see if they both feel hot, or one is much hotter than the other. If they feel same, but not too hot to touch, I'd do thermostat. If one hot, and one noticeably cooler, I'd do some checking on why flow is restricted to heater core. May be faulty flow valve, or partially clogged core. Have a look at My tip. Below is link, it may help in this case.
Repair Help & Product Troubleshooting for 2000 Chevrolet Blazer
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