darinfreed Posted January 8, 2013 Share Posted January 8, 2013 (edited) I've got a 2002 MR with 400hp E-tec. Antifreeze pushes out of the expansion tank cap. I recently had a hose leak and in the process replaced the thermostat and radiator cap. It had been fine for a while however recently we noticed the antifreeze disappearing. I put a pressure tester on the system and it did not lose any pressure. Upon filling it we noticed the antifreeze pushing out of the cap on the expansion tank. The truck does not over-heat (only when it pushes too much antifreeze out). There is no indication that there is antifreeze in the oil. I noticed the antifreeze in the reservoir looked like it was a little foamy, but I didn't see big air bubbles. After further analysis, it is pushing the cap open and pushing fluid out of the overflow hose. Edited January 8, 2013 by darinfreed Quote Link to comment https://www.bigmacktrucks.com/topic/29260-antifreeze-blowing-out-of-expansion-tank/ Share on other sites More sharing options...
rsb502 Posted January 8, 2013 Share Posted January 8, 2013 on an 02 this could mean the water pump is going out, the weep hole will get clogged and when it wants to go it will pop the seal in the rear and then over pressurize the system and pop the coolant tank had it happen on my 04 Granite and know a guy with an 01 RD had the same issue. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/29260-antifreeze-blowing-out-of-expansion-tank/#findComment-155977 Share on other sites More sharing options...
staxx Posted January 9, 2013 Share Posted January 9, 2013 Or could be air compressor head cracked . Quote Link to comment https://www.bigmacktrucks.com/topic/29260-antifreeze-blowing-out-of-expansion-tank/#findComment-156056 Share on other sites More sharing options...
57 bcr Posted January 9, 2013 Share Posted January 9, 2013 Had a bad head gasket do that to me,a few years back.Was on a 3208T Kitty Cat. Same symtoms,different truck,I know! Quote IF YOU BOUGHT IT, A TRUCK BROUGHT IT..AND WHEN YOU'RE DONE WITH IT, A TRUCK WILL HAUL IT AWAY!!! Big John Trimble,WRVA Link to comment https://www.bigmacktrucks.com/topic/29260-antifreeze-blowing-out-of-expansion-tank/#findComment-156063 Share on other sites More sharing options...
staxx Posted January 9, 2013 Share Posted January 9, 2013 I like checking easy stuff first check air tanks for anifreeze or intake piping to air compressor for antifeeze unhook discharge line check there too. Quote Link to comment https://www.bigmacktrucks.com/topic/29260-antifreeze-blowing-out-of-expansion-tank/#findComment-156077 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.