Question about 1999 Cadillac DeVille
I have an overheating problem when driving at highway speeds (55mph+). I can let car idle for long periods of time and no problem, drive 40mph or less, no problem. I recently replaced a cracked radiator, put on new hoses, replaced thermostat and surge tank cap (16#). Upper radiator hose heats up fine, thermostat opens around 195', plenty of heat, no white smoke from exhaust, no visible leaks or puddles, purge line flows. I revved engine up to 2500 rpm for several minutes to warm engine up with temp set at max hot. Symptoms: I put a cup under surge tank overflow line and captured coolant escaping from NEW Surge tank cap. If system is building pressure when hot, blows out coolant through surge tank cap/overflow line, then overheats-probably from low coolant, is this an indication of a blockage, trapped air, a blown head gasket or something else?
Could be a air pockets in the coolant system that have top bled out
it is a simple exercise to have a compression test done to check for head gasket or cracked head
Posted on Mar 14, 2017
Hi,
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!
Posted on Jan 02, 2017
SOURCE: my 1999 cadillc deville delegance
IF COOLANT SYSTEM BEEN BLED AND PLENTY COOLANT IN COOLANT SYSTEM. THE IGNITION TIMING LATE OR VALVE TIMING LATE TIMING CHAIN WORN WITH A LOT OF SLACK JUMPED A TOOTH ON CRANKSHAFT GEAR TEETH OR ENGINE CYLINDER BLOCK WATER JACKETS CLOGGED ENGINE BLOCK NEED FLUSHING. IF ENGINE OVERHEAT WHILE SITTING IDLING LONG TRAFFIC LINE COOLANT FANS NOT TURNING ON.COULD HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR FAULTY COOLANT FANS RELAYS OR BLOWN FUSE.PCM FAULT.CHECK ENGINE OIL IF IT LOOKS LIKE MILK SHAKE YOU HAVE BLOWN HEAD GASKET.
Posted on Jun 05, 2011
SOURCE: my 1999 cadillc deville delegance
Buy a block tester. It hooks up to your radiator and lets u know if exhaust gasses are mixing with your coolant wich would mean u have a (blown head). Do this before you spend anymore money.
Posted on Dec 10, 2012
Nov 01, 2016 | Cars & Trucks
Apr 17, 2016 | Ford Cars & Trucks
Aug 04, 2015 | Kia Sedona Cars & Trucks
May 06, 2014 | 1999 Cadillac Seville STS
Jul 14, 2012 | 1998 Plymouth Breeze
Apr 18, 2011 | 1997 Oldsmobile Silhouette
Jul 25, 2010 | 2004 Dodge Intrepid
Jul 07, 2010 | 1999 Jeep Cherokee
Aug 06, 2009 | 1998 Cadillac Seville
61 people viewed this question
Usually answered in minutes!
×