If it's running fine, I would try flushing the heater core. Look under the hood, find the hose from the water pump that goes to the heater core near the firewall. Also find the return line for the heater core. With them both unhooked, attach a garden hose to one end (clamps, duct tape, whatever holds it) and turn it on. You should only be flushing the heater core and not the block. You may get wet, and with some coolant. If you can't get a good flow, the core may be severely blocked. Possibly try flushing the other way. If still no succcess, try pouring in some CLR and waiting for the substance to take effect. If still no avail, buy a heater core. But only do any of this if your car is running just fine but you have no heat. Thanks!
Monday, October 22nd, 2018 AT 6:59 PM