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1995 Eldorado Touring Coupe
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9 Posts
Discussion Starter #1
Hi, I just joined!
I was googling for some info, and here I is!
I got a Touring Coupe I've been patiently restoring for a number of years.
Now, my problem:
I noticed the temperature is rising. Normal is usually around 192/4.
Now it will climb to 228...+. It will go down to 221, or so when I get back to speed.
I checked the antifreeze, the overflow tank was about half full.
I checked the oil, it is ok, which I thought so, but is an easy check.

I added about a quart of antifreeze, but thought this is unusual since I replaced the radiator & cap& hoses about 1 year ago, and it had remained constant.
The LOW COOLANT light went on the other day, The overflow tank still looked half full, but it took almost the whole gallon. Now the light is off, but the engine is still getting hot.
I replaced the radiator cap just in case, but this had no effect. I don't see a leak, and testing the system under pressure it doesn't show a leak. However I only checked it at idle.
I checked the carpeting if it is wet from the heater core, it is not.

Any suggestions on my next step?
 

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Registered
'94 Eldorado '83 Fleetwood
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223 Posts
If it were my problem I would check the water pump drive belt. If that is OK I would replace the thermostat, both items are easy to replace. If that doesn't fix the problem I'd seek the advice of someone who knows more than me.
 

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Registered
1994 Cadillac Eldorado Touring Coupe
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821 Posts
Exhaust gas test from your local AutoZone.
If it stays blue, then investigate further.
Good luck!
 

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Registered
1995 Eldorado Touring Coupe
Joined
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9 Posts
Discussion Starter #4
I noticed I made some grammar errors and spelling, only one was on purpose.
Sorry about that.
Thanks for your replies.
Checked out the prices on eBay for a pump and temp sensor, very reasonable.
I'll go to AutoZone this AM and see what diagnostic tests they have available.
Oh..and pick up some more antifreeze and likely a thermostat.
Thanks again.
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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86,626 Posts
DO NOT throw any more parts at it until you do the block test mentioned above.
 

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Registered
1995 Eldorado Touring Coupe
Joined
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9 Posts
Discussion Starter #6
I dropped by AUtoZone early this morning.
I asked them about the block test, they didn't know what I was talking about.
I started to go to another one, but thought, "I'm here now".
When I replaced the radiator and hoses, I did not replace the thermostat.
This was not acting like a bad thermostat from my experience with chevy short block engines. But a motors is a motor.
I bought a thermostat they are pretty cheap and some antifreeze, heck it cost more than the thermostat.
1st I did check the most common overheating w/northstar engine a blocked purge line. It is ok.
When I removed the old thermostat I could see the rubber gasket was deformed.
When it was originally installed it got pinched on one side, rather than fit cleanly in its pocket. This pulled that gasket a bit to the side, I assume after years of deterioration it started to leak/bypass a little antifreeze, like the thermostat out completely but not so severe.
She's happy now, staying at 201/2 at idle with the air on max.
It is blistering hot today too.
After a shower I'll run it on the highway to make certain, it should go down to 192 at speed.
I really luv this car. I've had a lot of cars, but this is one of my favorites for sure. For such a big rascal it gets 30mpg on the highway. Good enough for me. With the extra large sway bar on this touring model she stays flat on the turns, rock steady in a cross wind.
A pleasure to drive.
Thanks gentlemen for your replies.
I'll be back!
 
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