Question about 1999 Cadillac DeVille
New thermostat, new water pump, 7 month old radiator, and the car still runs hot. i noticed my heater doesnt kick in until i;m driving as i just bought a new heater core 3 weeks ago.
If you are seeing air bubbles, then the cooling system still has air pockets in it. Loosen the overflow cap and leave it that way for a few days while you drive.Keep the heater turned on at the max heat level. Roll a window down if necessary. Check and top up the overflow bucket daily and top up as necessary. The bubbles should disappear after a few days, then you can tighten the cap. This should also solve your no heat problem. Once the bubbles are gone you can tighten the cap.
If the problem doesn't fix itself in a week, you should have the car looked at for a possible bad head gasket, which would force air into the cooling system. Hope this helps.
Posted on Feb 20, 2012
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Posted on Jan 02, 2017
SOURCE: 95' Cadillac DeVille has no heat
You have air in the system. You have to park the car on an incline so the front of the car is higher than the rear, then run the engine with the radiator cap off and let the air escape while topping off the radiatorevery now and then. I was told about the incline to get the radiator higher than the heater core so that the air bubbles could come out.
Posted on Jan 16, 2009
SOURCE: 94 cadillac loosing water
look into the coolant recovery bottle with engine running and make sure hose i end is submerged. If you see bubbles, you have a head gasket leaking. How does the car run on start up?? a little rough at first?
Posted on Jun 09, 2009
Yes coolant flows through the intake. Are you sure you didn't put the thermostat in upside down? That's about the only thing that can cause a rad or heater core to blow. It should be installed so the spring part goes into the block.
Posted on Nov 18, 2009
SOURCE: i changed the water pump
Hello! It is extremely important that you only use Dex-Cool in your Cadillac's cooling system...It is Orange in color...If you have used another coolant or the block has not been flushed in some time, flushing is needed...
Drain the cooling system...Do not remove the thermostat...Fill radiator with drinkable water...Turn heat on full...Run engine until thermostat opens...Shut down, let cool then drain...Do this several times until water comes out clean...Replace thermostat...Replace O-rings on thermostat pipe...Coat thermostat bolts with Permatex...Re-fill with Dex-Cool...
Here is Vacuum Diagram...
Posted on Jan 26, 2011
Hello: ONE OTHER THING YOU MIGHT DO IS GO TO A AUTO PARTS STORE AND PURCHASE A SNIFFER KIT TO CHECK YOUR COOLING SYSTEM FOR EXHAUST GASES WHEN THE ENGINE IS AT OPERATING TEMPERATURE. THE KIT COMES WITH INSTRUCTIONS. IF YOU DON'T WANT TO BUY THE KIT MOST GARGES CAN PERFORM THE CHECK. A PRESSURE CHECK MAY NOT ALWAYS SHOW A LEAK OF A HEAD GASKET
Posted on Apr 08, 2011
Testimonial: "THANK YOU FOR THE INFO. I WILL GO GET THE TEST DONE THIS WEEK. DO U THINK IT WILL HURT TO DRIVE IT . IT HAS NOT OVER HEATED "
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