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Why will the heater blow hot then start blowing cold then back to hot on your 2002 Lincoln LS V8?
Wiki User
∙ 15y ago
If the car temperature comes up to operating temperature remains stable. If the heat from the vents seems ok as long as the rpm is above 2000rpm but heat from the vents stops when the car is stopped in traffice. Then the auxilary coolant pump may be bad. The auxilary coolant pump is a pump in the heater water lines and provides most of the hot water flow to the heater cores. Some hot water flow will exist just from the main water pump but only if the motor is at 2000 plus rpm. The system may have air in it, or be low on coolant. Top off the coolant. Bleed the air out using the bleeder valve attached to the degas bottle (aka coolant expansion tank), revving engine at 2000 rpm with the heat on full blast. Open the bleeder valve until coolant flows steadily. Repeat.
Wiki User
∙ 15y ago
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