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Hello Everyone, new to the forums here. My Fiance's 04 Auto TSX's radiator was having the classic seeping between the plastic and the aluminum. Ordered a Denso one and had the job complete in about 45 minutes. This is where I am stumped, I bled the system (I think) but heat never came out of the heater and the car temp started quickly creeping up. I have changed several radiators in BMWs over the years, Mazdas and stuff, and this is the first time I have been this stumped. The cap was left open while watching it bubble and such and I know there is flow as it started to steam and the level kept dropping as bubbled started to pop out like a jacuzzi. Definitely getting air out but not even the smallest bit of heat. Put the cap back on, drove it around her family's property and the temp started creeping up quickly so shut it down, popped the hood, and it is just steaming, I am thinking it is just spilled coolant from the bleed procedure burning off, have seen that several times before. I am just confused on the heat/overheating situation. Any pointers? Heat worked fine literally last night in it. Also, the fans were not coming on either during these sessions, did not check it with the A/C on. Going back there tomorrow with my pressure tester to make sure I took care of all possible leaks. I am thinking just trapped air maybe making the temp on the gauge creep up. I know the temp switch for the fans is in the radiators like my E36 BMWs are, but no dice.
 

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Check thermostat if that checks out start testing for head gasket leak. Hope that helps
Hey there. I went back the next day, radiator was low again. Filled it up and the ET and the heat worked fine thereafter. After like 20 minutes idling it started overheating again and I noticed the cooling fan wasn’t running. Jumped it to the battery and no dice. Went to advance real quick and popped a new one in. Issue is resolved now. It seems the fan issue was unrelated to the initial one but the trouble led me to the separate fan issue. I also pressure tested it when it was stone cold and it held 15 psi for like an hour so no leaks. She drives with the AC on 99.99% of the time and the AC fan works so that was probably keeping it from overheating for however long the fan was bad. Plus she has been working from home since last March so only drives the car around to shop not far from home. Probably never sits idling for any period of time without the AC on so never knew until bleeding it that the fan didn’t come on.
 
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