The best way I've read and done is to "burp" the system. Jack the front of the car up as high as you can, remove the cap, and turn the car on. You'll see air bubbles slowly escaping, and you'll need to keep adding coolant as necessary. This process is long (many hours usually), but necessary. You have to do it this way because the Heater Core is located in a spot that makes it higher than the top of the radiator when the vehilce is level, and air gets trapped in it because of this.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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