|
|
94 Deville Concours - overheats, but not head gaskets...?
|
|
|
| |
|
|
ElvisLives4ever
New User
May 19, 2008, 12:38 AM
Post #1 of 8
(2132 views)
|
|
94 Deville Concours - overheats, but not head gaskets...?
|
Sign In
|
|
Ok, so the car in question is a 94 Deville Concours 4.6 with 122k miles.
One day I'm driving and get a message on my display "engine coolant hot"
I start to change lanes to pull off the freeway when I see another message "Engine Overheat - Stop Engine" so I threw the tranny into Neutral and turned off the engine as I coasted onto the shoulder on the freeway.
I popped the hood, and the coolant cap was indeed very hot. Luckily I had some coolant in the trunk, so I waited a bit before opening the reservoir cap and added the coolant, I emptied the whole thing and could've added more.
After the engine cooled down a bit, I started driving again, same thing, "Engine Coolant Hot", I pulled over and filled up the reservoir tank with water. Also got a message displayed "AC Compressor OFF", but I believe thats naturally turned off when the engine gets too hot. I pulled over and cooled down the engine/added water a few times since I was a bit of a ways from home. It seems like it took in a lot of water, although no leaks. I stopped at the parts store on the way home and bought a new thermostat. I installed it on the spot. Still overheats.
No milkshake in the oil cap. No water out of tail pipes. Reservoir tank does not "false boil/bubble" when engine is running. Does not lack power. Doesn't seem like head gasket.
One thing I noticed though is that there is no heat, when I turn on the heat it just blows room temp or a little cool.
When I finally got home, I pulled the code P039 History. Could this be from throwing it into Neutral?
-What else can I do other than a pressure test to make sure it's not head gasket?
-What else could it possibly be? (Coolant Temp Sensor? Heater Core?, etc...?
)
So how can I check to make sure that the cooling system is not clogged? or Heater core clogged?
Also how do I check to make sure my water pump and water pump impeller are functioning correctly?
How can I flush the cooling system and make sure that there is no air pockets in there?
Anyone? Thanks in advance for any input.
|
|
| |
|
|
Double J
Veteran
/ Moderator
May 19, 2008, 2:12 AM
Post #2 of 8
(2127 views)
|
|
Re: 94 Deville Concours - overheats, but not head gaskets...?
|
Sign In
|
|
First thing ...
Did you check to see if the water pump belt broke?
Water pump has a separate belt ..not driven by the serpentine drive belt.
Water pump is located on the drivers side front of the engine.
Belt is under a shield.
Water pump is inside the water pump housing.
Northstar engine are known for head bolts pulling the threads loose.
To test for the problem, do a block check (block check kit at NAPA) chemical test on the coolant recovery bottle
Just a couple thoughts...
Let us know
Jim
|
|
| |
|
|
autojoe
User
May 19, 2008, 5:50 AM
Post #3 of 8
(2122 views)
|
|
Re: 94 Deville Concours - overheats, but not head gaskets...?
|
Sign In
|
|
if you kept adding coolant/water then it had to go somewhere.....either external leak or internal leak.
|
|
| |
|
|
ElvisLives4ever
New User
May 19, 2008, 9:27 AM
Post #4 of 8
(2118 views)
|
|
Re: 94 Deville Concours - overheats, but not head gaskets...?
|
Sign In
|
|
Thank you for the input,
Yes I checked the water pump belt underneath the shield, it seems to be running well. Is there a way to determine if the impeller is not functioning correctly?
Also, how would I check the system for exhaust gasses?
and also, how would I flush the cooling system and check it for clogs?
|
|
| |
|
| | |
|
|
ElvisLives4ever
New User
May 19, 2008, 1:51 PM
Post #6 of 8
(2106 views)
|
|
Re: 94 Deville Concours - overheats, but not head gaskets...?
|
Sign In
|
|
Ok, so I haven't had a chance to buy the Exhaust Test Kit yet, I figure if I'm losing coolant that fast the Test Ki might not pick up the exhaust in the coolant since it will be so fresh in the system. Either way I will do it soon just to be sure.
I'm still waiting on my neighor to do the pressure test? are there any instances when the pressure test will pass and still have a head gasket issue?
Also, I checked more for leaks and the bottom of the car is pretty wet, but the coolant level is up exactly where I left it last. So I'm only losing coolant when the motor is running, and I think only when it gets hot because I ran it for a little while today and the coolant was all the way up in the reserve tank (no rad cap on 94 Deville) but display still says "check coolant level"
Question: What could it mean that when I turn on the heat it blows room temp/cool air?
Quesion: Should the coolant bubble up at all when I start the engine?
When I start the engine it bubbles just for a sec then its totally fine, even when I rev it. Only when I rev it really high does the coolant bubble up.
|
|
| |
|
|
Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 19, 2008, 5:03 PM
Post #7 of 8
(2103 views)
|
|
Re: 94 Deville Concours - overheats, but not head gaskets...?
|
Sign In
|
|
It sounds like it's blowing combustion gasses into the cooling system, pressures up with bubbles not liquid and overheats and blows more out the overflow. Classic head gasket! It just might hold a pressure test as that's about 15lbs on the system and combustion pressures are sky high at just the right spots. There would be fumes in the newest of coolant quickly with this and looking at spark plugs can be telling also.
Test away - this is quite a job to be wrong with. Jim would know these specifically better than I do. Some may need all new head bolts and all should have heads sent out to machine shop for resurfacing or replacement if needed,
T
|
|
| |
|
|
ElvisLives4ever
New User
May 23, 2008, 12:24 AM
Post #8 of 8
(2083 views)
|
|
Re: 94 Deville Concours - overheats, but not head gaskets...?
|
Sign In
|
|
I think I fixed it!
So far so good...
So there was a leak by the neck of the bottom radiator hose outlet. We hooked up a pressure gauge to the reserve tank and the leak started gushing which is how we found it, but even still it was very difficult to spot.
Also the lower radiator hose (which had the thermostat in it) was all swollen and gummy, replaced that.
I speculate that the leak was either from a crack in the neck of the outlet or more so that the hose clamp wasn't put on correctly. Either way, we put on the clamp, filled it with water and ran it...
The bubbling up in the reserve when I revved the engine was air that was getting sucked in by the leak.
Ran perfect, heat works, ac works...
Thanks to everyone who chimed in.
|
|
| |
|
Auto Repair Home
SEARCH
WHO'S 
LOG 
mdma pills for sale : WhatsApp +33758633852
Drive Shaft Repair
2006 Toyoto Camry XLE Driver Side Electric Window Trouble
Grounding Cable, 2017 Jeep Renegade Trailhawk
equipment
