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Jun 14th, 2026
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Joined: Nov 2018
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OP
L - Learner Plates On
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I want to change the antifreeze on my 1994 plus 4 (T16 engine). My question is draining the system is easy enough but with the sealed system how do I refill? There’s a header tank with convention radiator cap, and the a cap on the radiator with a “do not remove” sticker. Do I top up with the radiator cap or just use the header tank? Any tips re bleeding the system?
Last edited by Tonyh157; 27/04/19 06:49 PM. Reason: Spelling errors
Tony
1994 Connaught Green Plus 4
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Talk Morgan Sage
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Talk Morgan Sage
Joined: Apr 2014
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The "Do not Remove" may refer to when the engine is hot. I was informed by my local trusted garage man to fill up the rad, not the header. This is a Kia but I presume the same applies, possibly.
Best Regards
Lang may yer lum reek
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Simple, fill the rad when cold, then fill the expansion tank to the marker. Drive as normal, but check the expansion tank level for a few drives, top to marker if needed.
.+8 Now gone for a 1800 4/4. Duratec in bright yellow.
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Fill using the radiator. I would then run the engine with the heater on & cap off so you can top up as needed whilst the air exits. This should take a few minutes max during which it can help to flip the throttle.
Once happy the air is out, turn off the car. Put the cap on the rad & open the expansion tank. Fill the expansion tank to the level & close.
With both tanks closed go for a drive till the car is at temperature. Keep the heater open till you are happy it is working.
Then park up at home & let it all cool down. Then you can recheck the expansion tank & fill if needed.
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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L - Learner Plates On
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By coincidence I've just come in from doing mine, a good opportunity after having to change the thermostat, also flushed the rad through. My procedure is pretty well as JohnV6 describes above, everything works perfectly now! Best of luck!
1999 4/4 Lowline
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It can also help to flush the heater matrix.
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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