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Sounds to me like your thermostat may be stuck open. When your going slow or idleing the motor will warm up and more hot water will be circulated through the heater core. When you are running at a higher rpm, the motor is cooler(because the water is circulated faster by the water pump) and the heater core gets cooler water instead of warmer water. I would guess that the thermostat is either stuck in the open position or is missing all together. So, does your temp guage show you at about 196 degrees all the time or does it drop as you speed up? The only way to check the thermostat is to pull it out and place it in a pan with water and heat it on the stove. Put a thermometer in the water and as the temp reaches about 195, the thermostat should start to open. Of course if it is bad, it may be open and stay that way through all this. Since they don't cost that much, its easier to just replace it. .
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Exactly where is heater blower resister on 1988 Ford Laser?
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your motor resister is bad or might be called the climate control module
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You have to remove the wipers and the cover that's underneath them. There is a hole on the passenger side that allows access to the resistor from under the hood.
