Radiator water level

Submitted: Saturday, Jul 05, 2003 at 23:27
ThreadID: 5834 Views:6836 Replies:5 FollowUps:1
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Does anyone know how full a radiator should be of water. Should it be filled to the brim or should I leave some breathing space.
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Reply By: Truckster (Vic) - Saturday, Jul 05, 2003 at 23:32

Saturday, Jul 05, 2003 at 23:32
Start car, run it for 20 secs with cap off, fill, leave running until themostat opens, and fill, put cap back on. turn off
AnswerID: 24296

Reply By: zigglemeister - Saturday, Jul 05, 2003 at 23:37

Saturday, Jul 05, 2003 at 23:37
The radiator itself should be completely full. If you have a plastic overflow bottle that should have a breathing space - should have max-min lines on it somewhere - but the radiator should be full. The radiator will "breathe", if necessary, by causing the radiator cap to lift up a bit and let some water out, if the pressure reaches that point. If you have an overflow bottle, the excess water goes in there, if you don't, it just runs onto the ground. Either way, as long as your radiator cap is in good nick, the cooling system can't become over-pressurised.
AnswerID: 24299

Reply By: Simon - Sunday, Jul 06, 2003 at 00:06

Sunday, Jul 06, 2003 at 00:06
If you have the overflow bottle radiator should be full, if not, as long as the water covers the core in the top tank.
Dont keep filling a radiator without an overflow tank cos it will just blow out the excess and find its own level anyway.
If it is regularly down below the core start lookn for leaks.
AnswerID: 24302

Reply By: Mick - Tuesday, Jul 08, 2003 at 00:14

Tuesday, Jul 08, 2003 at 00:14
The radiator should be full. All vehicles have an overflow bottle and rises and falls occur in that.
AnswerID: 24442

Follow Up By: Simon - Wednesday, Jul 09, 2003 at 18:43

Wednesday, Jul 09, 2003 at 18:43
Umm, not ALL cars have overflow bottles.
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FollowupID: 16514

Reply By: Brian - Saturday, Jul 12, 2003 at 08:47

Saturday, Jul 12, 2003 at 08:47
Heres a little aside to the question. Check manufacturer specs on what coolant, if any, should be used in the radiator and USE IT!! I had one of the first series water-cooled VW Transporter vans and because it didn't have the correct coolant, the motor corroded from the inside out!!! Many thousand dollar repair!!!!!!!!!!!! There are other cars that this applies to as well. So when I bought my GQ, the first thing i did was have my mechanic change ALL the oils and make sure the right coolant is in the radiator!!! Good advice people, can save you $$$$$$$$'s!
AnswerID: 24764

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