For 1990-2009 cars

# No Heat after Replacement of the Heater Water Valve or Water Pump - kw cold cool coolant core hose HVAC low no temperature

Subject: | No Heat after Replacement of the Heater Water Valve or Water Pump

Models: | .

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in the PI.

### Condition/Concern:

Neither SI nor the printed service manuals indicate the orientation of the three hoses that connect to the heater water valve. The following information should aid in proper connections of the hoses.

### Recommendation/Instructions:

The heater water valve has three connections. There is a single port on one side and dual ports on the other. The two, on the one side, are stacked vertically. The port on the single hose side is the hot water inlet from the engine. The upper port on the dual side is for output to the heater core. The lower port on the dual side is for bypass back to the engine.

THE VALVE AND THE HOSES ARE SHOWN IN THE FOLLOWING LOCATIONS:

YEAR | SI DOC. No. | SVC. MANUAL BOOK 1
--- | --- | ---
2001 | 602117 | PAGE 1-83
2000 | 602117 | PAGE 1-77
1999 | 399284 | PAGE 1-159
1998 | 256514 | PAGE 1-163
1997 | N/A | PAGE 1-222

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

### Models:

(97, 98, 99, 00, 01 Cadillac Catera)

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