Cadillac Owners Forum banner

1 - 6 of 6 Posts

·
Registered
1999 Cadillac Deville
Joined
·
5 Posts
Discussion Starter #1
Where is the Drain Hose (the one coming out of the coolant cap) suppose to go? Is it supposed to lead back into the coolant system? or is supposed to just overflow and hit the road.

Tonight when I got home I noticed a line of coolant that followed me up the road and driveway, im not sure how far the line is... Also, after driving my car for about 40-50 miles my car overheats, before it overheats the A/C turns off, or at least the dash says it is, and then the it tells me to idle the engine, when i do, i immediately get out of my car and notice coolant not leaking but flooding the road, looks like maybe a half a gallon of coolant. I then need to replace the lost coolant before driving again.

The radiator was replaced recently, so what's going on?
 

·
Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
Joined
·
70,751 Posts
The hose from the cap is an overflow and it drains to the ground. If you had coolant coming from that hose, then there are two possibilities - Either the cap pressure relief spring has failed or (more likely) your system was overfilled during the radiator job. The proper coolant level is halfway up in the reservoir, COLD. Never check coolant level with the engine warm/hot.

Do a thorough search for other coolant leaks.

Make sure the water pump drive is functioning properly - the pulley and belt under a shroud at the driver's end of the engine.

Your engine cooling system has a purge line which runs from the top side of the reservoir over to a hollow bolt nipple at the water pump cover area. With the car cold, remove the line from the side of the reservoir, hold it in the open neck, and have an assistant start the engine normally. Does the purge line flow water into the reservoir ??? If not, it or the hollow bolt/nipple is clogged and the system cannot purge itself of air and gases, so it's possible that your water pump is cavitating, causing the overheat.

BUT, if the purge line is clear and you continue to experience coolant loss and "boilover", then you need to get one of these kits, do a test for exhaust gas in the coolant, and cross your fingers. A Northstar will not put oil in the coolant due to a blown head gasket. 1999 is the worst year for this gasket failure.

www.sjdiscounttools.com/lis75500.html
 

·
Registered
1999 Cadillac Deville
Joined
·
5 Posts
Discussion Starter #4
Okay, well on my way home the coolant reached 248 degrees and climbing, so i put my hazards on and drove 50 on the freeway until i got home. The coolant temperature dropped slowly going at 50, but as i was making my final turn onto my street, i noticed white smoke coming out of the dashboard, through the steering wheel. Im scared to get into my car again.
 

·
Super Moderator
2010 DTS
Joined
·
87,448 Posts
That smoke is just grease burning off of the turn signal contacts. Somewhat common, but you have much bigger fish to fry right now.
 
1 - 6 of 6 Posts
Top