DemonElf Posted April 26, 2016 Member ID: 2691 Group: **- Inactive Registered Users Followers: 11 Topic Count: 42 Topics Per Day: 0.01 Content Count: 170 Content Per Day: 0.04 Reputation: 155 Achievement Points: 1459 Solved Content: 0 Days Won: 0 Joined: 07/25/11 Status: Offline Last Seen: November 21, 2017 Birthday: 04/18/1991 Share Posted April 26, 2016 Hello fellow gear head idiots. I have a 1998 Olds Aurora, 4.0L DHOC V8 Northstar engine. Just had my coolant change and thermostat. Before it would sit at 250° according to my temp gauge on the dash, when i drive it drops to 200. Now its the same but when i start the engine after driving it would jump to 270°. Advice on if my temperature sensor is bad or do i have overheating issue? One guy said that my head gasket is leaking but my fluid level never changes, no coolant out the exhaust, none in the oil, no oil in the coolant tank. Thanks Link to comment Share on other sites More sharing options...
codpiece Posted April 26, 2016 Member ID: 5470 Group: *** Clan Members Followers: 52 Topic Count: 371 Topics Per Day: 0.09 Content Count: 2482 Content Per Day: 0.61 Reputation: 3552 Achievement Points: 22894 Solved Content: 0 Days Won: 7 Joined: 02/04/13 Status: Offline Last Seen: Tuesday at 08:24 PM Birthday: 09/17/1968 Device: Windows Share Posted April 26, 2016 @@ldoz might be able to help you. He is a mechanic. Link to comment Share on other sites More sharing options... Awards
Damage_inc- Posted April 26, 2016 Member ID: 2048 Group: ***- Inactive Clan Members Followers: 0 Topic Count: 294 Topics Per Day: 0.06 Content Count: 6689 Content Per Day: 1.37 Reputation: 4709 Achievement Points: 48999 Solved Content: 0 Days Won: 5 Joined: 12/15/10 Status: Offline Last Seen: November 29, 2023 Birthday: 05/30/1967 Device: Windows Share Posted April 26, 2016 (edited) your coolant fans should be comming on around 200-220 to kool engine.id look into that-maybe 2 fans .relay and sensor .check if fans working .if not fix that first-id guess a dead high speed fan love this guy this is a basic .may or maynot pertain to your car- Edited April 26, 2016 by Damage_inc- Link to comment Share on other sites More sharing options... Awards
Slackernet Posted April 26, 2016 Member ID: 23498 Group: ++ Minecraft Admin Followers: 12 Topic Count: 106 Topics Per Day: 0.03 Content Count: 700 Content Per Day: 0.23 Reputation: 229 Achievement Points: 5750 Solved Content: 0 Days Won: 1 Joined: 11/12/15 Status: Offline Last Seen: Monday at 07:22 PM Device: Linux Share Posted April 26, 2016 (edited) The coolant system is all about flow. The fans only help at idle when there is no air flow from driving down the road. Yes the northstar design is prone to head gaskets going bad. The head bolt threads pull out of the alum. block from expansion and contraction over the years. To verify the coolant temp sensor CTS is reading right, you will need a meter and a way to check temp. to check temp this is the cheapest way to do so..... Non-contact Infrared Thermometer Temperature Gun with Laser Sight http://www.amazon.com/Nubee-Non-contact-Infrared-Thermometer-Temperature/dp/B00JA3BMDW/ref=sr_1_10?ie=UTF8&qid=1461672264&sr=8-10&keywords=pyrometer Here is the resistance table for the CTS. you need a digital meter set to ohms to check this. ohms can only be checked with no power to the sensor. it has to be unplugged. it will set a code while testing as the circuit will be open. not to worry once you plug it back in an run the car a few times the code you created from testing will clear itself PS: If you would rather roll the dice on a new CTS they are only 15.00 and are easy to install.Its literally one plug and if you are quick you will not loose to much coolant at all Here is an OEM AC Delco sensor on amazon http://www.amazon.com/ACDelco-213-928-Equipment-Multi-Purpose-Temperature/dp/B000C9I038/ref=au_as_r?_encoding=UTF8&Make=Oldsmobile%7C51&Model=Aurora%7C567&Year=1998%7C1998&ie=UTF8&n=15684181&newVehicle=1&s=automotive&vehicleId=1&vehicleType=automotive Edited April 26, 2016 by Slackernet Link to comment Share on other sites More sharing options... Awards
7Toes Posted April 27, 2016 Member ID: 87 Group: ***- Inactive Clan Members Followers: 57 Topic Count: 98 Topics Per Day: 0.02 Content Count: 3789 Content Per Day: 0.71 Reputation: 3589 Achievement Points: 27249 Solved Content: 0 Days Won: 7 Joined: 09/02/09 Status: Offline Last Seen: March 18, 2022 Birthday: 04/02/1871 Share Posted April 27, 2016 if your head gasket is leaking then exhaust is blowing into your coolant making the high temp Link to comment Share on other sites More sharing options... Awards
JohnnyNashville Posted April 27, 2016 Member ID: 25938 Group: ***- Inactive Clan Members Followers: 21 Topic Count: 343 Topics Per Day: 0.14 Content Count: 1493 Content Per Day: 0.59 Reputation: 284 Achievement Points: 13299 Solved Content: 0 Days Won: 0 Joined: 05/17/17 Status: Offline Last Seen: December 25, 2022 Birthday: 08/08/1961 Share Posted April 27, 2016 Sounds like you have some sort of blockage....flush your system and refill with new antifreeze, go ahead and toss on a new thermostat...let us know if that works aj Link to comment Share on other sites More sharing options...
BUDMAN Posted April 27, 2016 Member ID: 800 Group: *** Clan Members Followers: 152 Topic Count: 135 Topics Per Day: 0.03 Content Count: 6940 Content Per Day: 1.32 Reputation: 4486 Achievement Points: 58192 Solved Content: 0 Days Won: 6 Joined: 11/27/09 Status: Offline Last Seen: 1 hour ago Birthday: 05/29/1957 Device: Windows Share Posted April 27, 2016 (edited) If it cools down as you drive, it is an air flow concern. (electric fans) note .. engine always gets hotter after being shut off !! Edited April 27, 2016 by BUDMAN Damage_inc- 1 Link to comment Share on other sites More sharing options... Awards
DemonElf Posted April 27, 2016 Member ID: 2691 Group: **- Inactive Registered Users Followers: 11 Topic Count: 42 Topics Per Day: 0.01 Content Count: 170 Content Per Day: 0.04 Reputation: 155 Achievement Points: 1459 Solved Content: 0 Days Won: 0 Joined: 07/25/11 Status: Offline Last Seen: November 21, 2017 Birthday: 04/18/1991 Author Share Posted April 27, 2016 The mechanic ive been talking to said to try taking a pressure nozzle to the radiator to clean the exterior of it. If still overheating, then need to get a new radiator due to possible blockage. He ran through step by step things to fix that are the lowest cost. Already replaced the thermostat with a fail safe thermostat that will fail in the open position if it overheats. He told me off the bat my water pump is a bitch to get to since it is cam driven and not belt. Oh and learned about the GM pills for my radiator and engine. GM knew about the warping of the heads and just made a solution to the heads leaking by a sealant that is constantly running through the system. Thanks all for the suggestions. Will keep you posted. @@Slackernet the mechanic tested my cts and read the temp of the bottom of the heads of the engine. Temp gauge is reading right. Slackernet 1 Link to comment Share on other sites More sharing options...
bds1961 Posted April 27, 2016 Member ID: 1213 Group: *** Clan Members Followers: 19 Topic Count: 172 Topics Per Day: 0.03 Content Count: 5349 Content Per Day: 1.04 Reputation: 13963 Achievement Points: 47128 Solved Content: 0 Days Won: 174 Joined: 03/04/10 Status: Offline Last Seen: 4 hours ago Birthday: 10/11/1961 Device: iPad Share Posted April 27, 2016 Warm the car up. Then run your hand up the radiator. If there is any blockage the bottom section of it will be cool and it will get warmer as you slide your hand up. Most cars use a cross flow radiator with the tanks on the sides. Sediment as it builds up plugs the tubes that run from side to side on the bottom first. If that turns out to be the case it is usually best just to changes it out. A lot of manufactures went to plastic tanks on the ends that are hard to remove and replace for cleaning them out. The cost to have it rodded out is close to the same price to change it out if you do it yourself. Link to comment Share on other sites More sharing options... Awards
Damage_inc- Posted April 27, 2016 Member ID: 2048 Group: ***- Inactive Clan Members Followers: 0 Topic Count: 294 Topics Per Day: 0.06 Content Count: 6689 Content Per Day: 1.37 Reputation: 4709 Achievement Points: 48999 Solved Content: 0 Days Won: 5 Joined: 12/15/10 Status: Offline Last Seen: November 29, 2023 Birthday: 05/30/1967 Device: Windows Share Posted April 27, 2016 (edited) If it cools down as you drive, it is an air flow concern. (electric fans) note .. engine always gets hotter after being shut off !! correct-check the fans he said he already changed the fluid and tstat and he did not say if overheated boiled over yet so id make sure the hi speed fans kiks in-if fans not comming on to cool then fix them.first yes northstars have headgasket problems sometimes but it would boil over and if it does boil over then get a sample of coolant when it boils over and test it for hydrocarbons.to see if infact it is a headgasket issue like this Edited April 27, 2016 by Damage_inc- Link to comment Share on other sites More sharing options... Awards
DemonElf Posted April 28, 2016 Member ID: 2691 Group: **- Inactive Registered Users Followers: 11 Topic Count: 42 Topics Per Day: 0.01 Content Count: 170 Content Per Day: 0.04 Reputation: 155 Achievement Points: 1459 Solved Content: 0 Days Won: 0 Joined: 07/25/11 Status: Offline Last Seen: November 21, 2017 Birthday: 04/18/1991 Author Share Posted April 28, 2016 The fans do kick on at idle. Possibly a blockage in the radiator. Thats where I'll start and hope it fixes it. Now have to find one, the mechanic found one on ebay but i camt locate it on my searches. Least mine is easy to search for since there is only one engine made for it. Link to comment Share on other sites More sharing options...
loaderXI Posted April 28, 2016 Member ID: 252 Group: +++ COD2 Head Admin Followers: 71 Topic Count: 392 Topics Per Day: 0.07 Content Count: 6417 Content Per Day: 1.20 Reputation: 6494 Achievement Points: 54337 Solved Content: 0 Days Won: 30 Joined: 09/05/09 Status: Offline Last Seen: Tuesday at 01:37 PM Birthday: 03/22/1965 Device: Windows Share Posted April 28, 2016 @@DemonElf The water pump on these are known for taking a shit and wiping out the pulley and belt...They are not that hard to do your self but you do need a special tool to R+R as they turn in and out http://www.ebay.com/itm/RADIATOR-FOR-CADILLAC-OLDSMOBILE-FITS-DEVILLE-FWD-AURORA-4-0-4-6-V8-8CYL-/271458079864?fits=Make%3AOldsmobile%7CModel%3AAurora&hash=item3f34299478:g:8GAAAOSw9mFWL5So&vxp=mtr Short clip Link to comment Share on other sites More sharing options... Awards
KaptCrunch Posted April 28, 2016 Member ID: 389 Group: *** Clan Members Followers: 45 Topic Count: 295 Topics Per Day: 0.06 Content Count: 4459 Content Per Day: 0.84 Reputation: 3620 Achievement Points: 36445 Solved Content: 0 Days Won: 39 Joined: 09/14/09 Status: Offline Last Seen: 10 hours ago Birthday: 01/01/1970 Device: Windows Share Posted April 28, 2016 other is your timing chian is stretched, check TDC to marks other is spark timing running to late Link to comment Share on other sites More sharing options... Awards
KaptCrunch Posted April 28, 2016 Member ID: 389 Group: *** Clan Members Followers: 45 Topic Count: 295 Topics Per Day: 0.06 Content Count: 4459 Content Per Day: 0.84 Reputation: 3620 Achievement Points: 36445 Solved Content: 0 Days Won: 39 Joined: 09/14/09 Status: Offline Last Seen: 10 hours ago Birthday: 01/01/1970 Device: Windows Share Posted April 28, 2016 forgot to say the rad fins are solid to tubes and not crunchy Link to comment Share on other sites More sharing options... Awards
CW4 Posted May 3, 2016 Member ID: 2902 Group: *** Clan Members Followers: 15 Topic Count: 15 Topics Per Day: 0.00 Content Count: 229 Content Per Day: 0.05 Reputation: 213 Achievement Points: 1672 Solved Content: 0 Days Won: 1 Joined: 10/17/11 Status: Offline Last Seen: Saturday at 10:01 PM Birthday: 06/11/1952 Device: Windows Share Posted May 3, 2016 So right after starting it up after driving a while does the temp drop from 270 back to the normal range? Had a RV with a Ford 460 it it that would almost be pegged out on the gauge if I cranked up 5 minuted after driving for a bit. Always dropped back down in a minute or so to where she normally ran at. Link to comment Share on other sites More sharing options... Awards
Logan Posted May 4, 2016 Member ID: 582 Group: ++ COD2 Admin Followers: 20 Topic Count: 33 Topics Per Day: 0.01 Content Count: 361 Content Per Day: 0.07 Reputation: 389 Achievement Points: 3272 Solved Content: 0 Days Won: 0 Joined: 10/17/09 Status: Offline Last Seen: May 1, 2020 Birthday: 11/22/1956 Share Posted May 4, 2016 Your new thermostat is it the correct temp. unit? The older engines ran around 180 to 195. The newer engines run a hotter thermostat due to EGR and emission controls. Also, does your thermostat sit flat horizontal or does it sit in the engine vertical to the block, if so, check to make sure the vent hole in the thermostat is to the top of the block, so air doesn't get trapped. To check if it is a flow problem try a radiator pressure pump. It pumps air into your (full) cooling system to check for leaks (pressure drop)blown head gaskets (pressure build) plugged rads (rev engine and see if it builds slight pressure, then let it idle and the pressure should drop fast, if not, then your rad is restricting flow) These pumps are not that expensive or your garage could do it. Should give you an answer. Hope it helps. Link to comment Share on other sites More sharing options... Awards
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