Wong Posted December 9, 2017 Share Posted December 9, 2017 Need to drain the cooling system, but am having trouble finding the drain on the radiator- do they all have them, or do I need to remove the lower hose? Quote Link to comment https://www.bigmacktrucks.com/topic/51916-easiest-way-to-drain-radiator-on-1969-mack-fire-engine/ Share on other sites More sharing options...
carlotpilot Posted December 9, 2017 Share Posted December 9, 2017 3 hours ago, Wong said: Need to drain the cooling system, but am having trouble finding the drain on the radiator- do they all have them, or do I need to remove the lower hose? can`t imagine a radiator without a drain somewhere welcome to the site Quote Link to comment https://www.bigmacktrucks.com/topic/51916-easiest-way-to-drain-radiator-on-1969-mack-fire-engine/#findComment-387026 Share on other sites More sharing options...
fxfymn Posted December 10, 2017 Share Posted December 10, 2017 Welcome to the site. If you put the specific model on here someone will tell you where it is. One thing to be especially careful with on a fire truck is to ensure that the engine cooling line running from the radiator to the pump is drained. This line contains raw water, not anti-freeze, and is notorious for freezing. If it freezes in the internal heat exchanger it can ruin the radiator. When you open the pump drains do not assume the pump is dry just because water does not flow out of the drains. If it does not the chances are that the drain is plugged with dirt and needs to be cleaned out. Do not open the "master" drain under pressure or you will blow the "O" ring out of it and it will leak. Quote Money, sex, and fire; everybody thinks everyone else is getting more than they are! Link to comment https://www.bigmacktrucks.com/topic/51916-easiest-way-to-drain-radiator-on-1969-mack-fire-engine/#findComment-387106 Share on other sites More sharing options...
Wong Posted December 10, 2017 Author Share Posted December 10, 2017 Thanks alot, the truck overheats, then the water gets pushed out the overflow tube, one shop said probable blown head gasket....am thinking of using block seal, is there anything I should check, before attempting this? Quote Link to comment https://www.bigmacktrucks.com/topic/51916-easiest-way-to-drain-radiator-on-1969-mack-fire-engine/#findComment-387119 Share on other sites More sharing options...
KKERGALL Posted December 10, 2017 Share Posted December 10, 2017 Do a pressure test. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/51916-easiest-way-to-drain-radiator-on-1969-mack-fire-engine/#findComment-387121 Share on other sites More sharing options...
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