Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSDODGE AND RAM1999DAKOTA SLT, 2D PICKUP, 3.9 X, 4WD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHEATER SYSTEMTESTINGHEATER CONTROL PANEL
1999 Dodge and Ram Dakota SLT, 2D Pickup, 3.9 X, 4WD, Standard
Heater Control Panel
1999 Dodge and Ram Dakota SLT, 2D Pickup, 3.9 X, 4WD, StandardSECTION Heater Control Panel
- Connect a vacuum gauge in line with Black heater vacuum supply hose (located at tee near power brake booster, in engine compartment). Position gauge so it can be viewed from passenger compartment.
- Start engine. While observing vacuum gauge, rotate mode control knob to each mode position (one position at a time). Pause after each selection. Vacuum gauge should drop then return to 8 in. Hg shortly after each selection is made. If vacuum gauge reading is as specified, go to next step. If gauge reading is not as specified, check for vacuum leak in vacuum lines or heater control panel.
- Move temperature control knob quickly to full hot and full cold positions. A distinct sound of blend-air door hitting its stops should be heard. No spring-back of knob should exist.
- If temperature control knob operates as specified, temperature control system is okay. If temperature control knob does not operate as specified, check condition, routing, installation and adjustment of temperature control cable. See TEMPERATURE CONTROL CABLE under ADJUSTMENTS.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.