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Feel the heater hoses see if one is hot and the other cold. May be airbound and have to be bled. Could be defective Thermostat that is not closing to allow engine temp to get hot enough disconnect heater hoses and run a garden hose through to make sure heater core is not plugged Check heater control cable to make is operating properly Pressure test cooling system to check for leaks

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Q: How do you get the heater to work in an 1989 Laser are there any ways of finding blockages or leaks in the heater lines?
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