Lumina L4-151 2.5L (1991)
5. Loosen clamp and remove hose from dash side heater inlet.
6. Temperature switch electrical connector and remove switch from lower intake manifold.
7. Use a open end wrench to remove heater inlet nipple from engine.
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To obtain more wrench access to the inlet nipple, it may be necessary to loosen the clamp bolt which retains the throttle body heater inlet pipe.
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The heater inlet nipple will rotate around the pipe.
Inspect
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O-ring sealing surface on pipe.
Adjust
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If replacing heater inlet nipple, remove retainer from pipe and discard, as new nipple is equipped with retainer.
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If replacing pipe, remove retainer from pipe and reinsert in nipple.
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If reusing pipe and nipple, retainer can remain in place on pipe.
Install or Connect
1. Heater inlet nipple to engine.
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If reusing nipple, coat threads with sealant, GM P/N 1052080 (or equivalent).
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Tighten the clamp bolt with retains the throttle body heater inlet pipe if removed or loosened.
2. Push pipe into nipple until retainer tabs lock.
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Pull back on pipe to check for proper engagement.
3. Temperature switch to lower intake manifold and electrical connector.
4. Hose to dash side heater inlet, and tighten clamp.
5. Pipe bracket block stud nut.
6. Pipe bracket transaxle stud nut.
7. Refill coolant.
8. Air cleaner.
