View Full Version : eldo running hot

03-24-14, 07:24 PM
Hello Everyone, Tonight on the way home my '99 eldo base model Y engine ran hot steaming
like a locomotive. I tightened a hose clamp, refilled the reservoir, put the cap on, started it and
instead of it cooling down it went a little higher. The water pump is turning it has 40k on it
from GM dealer garage. Here is a short history. It had HG at 63k and exhaust valves/cams/lifters at 105k and has 140k now
Ok calm down ( to myself ) after a cool down I started it up and so far it has maintained a
normal temperature. A drive to work in the AM will probably tell me if its going to me OK or
not. Im going to look at alldata after here at the WP belt tensioner. Is it adjustable or get
replaced if its weak? thanks Ed:gg:

03-24-14, 08:40 PM
check the PURGE LINE -

03-24-14, 08:51 PM
The WP drive tensioner pulley - tension - is not adjustable: it uses a spring-loaded arm to maintain fairly constant belt tightness during power application, steady cruise and belt stretch conditions. Remove the safety shroud and check the "springiness" by levering the arm with either a small crescent wrench on the lug cast into the arm or a 1/4" socket drive in the provided square hole in the arm. Pictures in my albums.

03-24-14, 09:01 PM
Maybe it was just a stuck thermostat. Keep your fingers crossed.

When the HG's where done, did they insert all 20 bolt holes? If so, do you know which inserts they used?

03-25-14, 11:11 AM
At the 63k it was serted next size up ,at 105k it went to GM's ('new' they told me) 5/8 sert, they did all of them. N*
did not overheat this morning. 6 miles at 65- 6 at 45- then 6 miles at 70...Tonight it will be 18 miles of 65 to 70.
I'm getting ready to check the belt tensioner and the purge line. Thanks for the crossed fingers. Hey Sub , would you
give me directions to your albums? please and thank you.

03-25-14, 01:09 PM
The Community tab ^^^, Albums, the red Seville.

2 albums, 6 pages of Northstar stuff.

03-25-14, 02:29 PM
purge line is in good shape, tensioner (since I don't have the correct tool) with a 1/4 "by 5"long ratchet had pressure
equal of about 8 to 10 ft lbs of torque. That measurement is probably a crapshoot but it wasn't bottomed out even
though its all in the spring
Maybe it was all in the clamp. Have not driven home yet but I did check your suggestions. thank you all

03-25-14, 02:36 PM
purge line is in good shape
How did you check it? You can't tell by looking at it. You need to pull the line from the surge tank (engine cold). Stick it in the open filler neck and start the engine. You want to, and should see, coolant flow.

03-25-14, 03:32 PM
Thanks Ranger, the coolant doesn't look as to be under pressure and the volume would seem to be enough to go
through the brass inlet of the tank. seems like it should come out faster than it does. What do you think, or anyone else also..

03-25-14, 08:37 PM
On a cold start the coolant is not under pressure and at idle the flow is small. The important thing is that there IS flow and the line is not clogged. Flow will increase with RPM.

03-26-14, 06:55 AM
If it was steaming like a locomotive, then there was a massive coolant leak to any of the hot parts on the engine. You mentioned that a hose clamp was tightened, was that the leak point? The overheating might have been due to loss of coolant. After introducing air in the cooling system (by significantly low coolant level), the air needs to be purged through the purge line, that's probably why you saw the temp jump a little.

03-26-14, 11:49 AM
Thank you everyone, Yes the steam was coming out of the loose clamp connection, upper rad hose. With it tightened
up ,filled up and warmed up it seems to be doing ok, if you can call 3 tests of 18 miles each at 65& 70mph a true test.
I am so HG failurephobic, I know that the re-sert with the 5/8 is the N*'s last chance. My last daily driver I had for 17 years and looked brand new, with 257k miles, my point I suppose is I buy a car that looks sharp and keep it maintained
knowing it will take me where I want to go and back, although nothing is certain the HG's freak me out.
Thanks again to every one...Ed:usflag:

03-26-14, 09:19 PM
It's too early to jump on the HG bandwagon. Since you are having no symptoms as of now, I would not worry about it. Just keep your eyes on the coolant level so you don't run low again, and that's everything it needs now. Enjoy the car! :burn: