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container/site/content/posts/2026-01-06-replace-thermostat-housing/index.md

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+categories = ["vehicle"]
+date = 2026-01-03T16:00:00Z
+description = ""
+draft = false
+slug = "2026-01-06-replace-thermostat"
+title = "🌡️ Replacing Thermostat Housing Assembly"
+author = "nicholas"
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+
+The engine coolant temperature gauge reports temperatures that are too low. The engine never reaches the proper operating temperature. The cabin air heating system produces only slightly hotter-than-ambient air. The upper radiator hose begins to warm immediately on starting the car. These are all symptoms of a thermostat that is stuck in the open position.
+
+## 🛠️ Parts and equipment
+- Murray Plus 221 Degree Thermostat Housing - 73021
+- car ramp (2)
+- wheel chocks (2)
+- torx E10 socket
+- hex 10mm socket
+- flat head screwdriver
+- phillips head screwdriver
+- wrench
+- clamp pliers
+- hook pick
+- drain pan
+- DEX-COOL engine coolant
+
+## ⚙️ Process- drain coolant system
+| step | tool(s) |
+|---|---|
+| position car on ramp | car ramps, wheel chocks |
+| remove negative battery terminal clamp, disconnect | hex 10mm socket, ratchet |
+| remove air filter hose | flathead screwdriver |
+| remove bottom hose | hook pick |
+| unscrew bleeder valve completely | phillips screwdriver |
+
+
+## ⚙️ Process - replace thermostat housing assembly
+
+| step | tool(s) |
+|---|---|
+| remove negative battery terminal clamp, disconnect | hex 10mm socket, ratchet |
+| remove air filter hose | flathead screwdriver |
+| remove sensor connector |  |
+| remove positive crank ventilation hose |  | 
+| remove upper radiator hose | hook pick |
+| remove thermostat housing assembly | torx e10, ratchet |
+