Question about Cadillac STS
Re: Where is the lower radiator hose?(99)
Stand in front of the car, open the hood, and face the engine.
Where is the lower radiator hose 99
On the left hand side of the radiator, at the top, is the upper radiator hose; which goes to the upper water pump connection.
On the right hand side of the radiator, from the bottom, is the lower radiator hose; which goes to the lower water pump connection.
It is a forum and goes on about draining the radiator.
Posted on Mar 31, 2015
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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.
Here's a link to this great service
Posted on Jan 02, 2017
Same problem with my 96 cadillac, don't be a fool like me, or anybodyelse and replace things such as RADIATOR, THERMOSTAT, WATER PUMP, HEATER CORE, HOSES, RADIATOR CAPS, RADIATOR FANS, And don't waste all of your money on coolant like i did. It is either Head Gasket, or Head Bolts pulled. I have replaced everything above and more, and still overheats, just as other people said and told me HEAD GASKET and i did not listen, now i wasted all of my money on stuff that did not need to be replaced. I'm sure you have a Northstar? Like me? One of the worst engines ever built in my book. Sell it quick if you do not have the money to fix it with, which is very costly. Or get a 4.9 which is more stable.
Posted on Aug 12, 2009
90's Cavaliers are notorious for problems such as these.
I hate to be the barrier of bad news, but in this case I would suggest that your engine either has a blown head gasket, and/or a warped head.
There is also the possibility that you blew a "soft plug" or cracked the block and that the coolant is leaking out through the base of the engine.
To find out of you have a blown head gasket, you can remove the oil cap from the valve cover and inspect it. If it has a yellow-brown-ish goo that is the consistency of paint, then you definitely have a blown head gasket and coolant has mixed with your oil. Meaning that you likely need an overhall.
You can also check by removing your radiator cap and checking to see if little tiny bubbles come up while the car is running. That is a sign of a compression leak, meaning that you most likely have a crack somewhere in either the cylinder head or the block.
Also, those cars have many very small radiator hoses that are in the middle of the engine and hard to see, find or replace.
In this instance, it sounds like your car has over heated more than 4 times, and once you get to that point you are likely to have fried the engine. This is because the newer engines are mostly aluminum and can't stand that much heat that often.
I would suggest seeking either a new car, or seeking a used engine to replace in your car. A used engine for those is fairly cheap compared to the price of fixing the problems that are likely to have occurred from excessive over heating.
Posted on Nov 11, 2009
The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.
Posted on Jun 19, 2010
SOURCE: My radiator fans will not
They will only come on if the engine is over 225 degrees or the ac is on.The fans are controlled by the pcm. There are three fan relays located in the relay center under the hood on driver side. The puller fan (radiator side) is controlled by the PCM and relay B which is the first relay on the right side of the relay center counting from the front of the car (nearest driver side headlight).
Posted on Jun 02, 2011
Tips for a great answer:
Nov 18, 2016 | Cadillac Cars & Trucks
Jan 11, 2016 | Cadillac Cars & Trucks
Feb 14, 2015 | Cars & Trucks
Nov 27, 2014 | 2008 Cadillac STS
Sep 24, 2012 | 2001 Cadillac Sts
Jul 18, 2011 | Cadillac STS Cars & Trucks
Dec 21, 2019 | Cadillac Cars & Trucks
93 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: