Car won't start when outside temp higher then 75 degrees

Tiny
CALVIN MCCOY
  • MEMBER
  • 1996 CADILLAC SEVILLE
  • V8
  • AUTOMATIC
  • 170 MILES
My 1996 Cadillac Seville sts. Won’t start when the outside temp reaches 75 degrees or higher. If the car is being driven when the out temp goes past 75 degrees, it will start running rough. If you turn the car off, it won’t restart until outside temp goes down to around 72 degrees and lower. No warning lights or indicators read out. The temp gauge read normal operations. Is there a sensor or something that’s reading the out temp as the car is overheating and shutting it down?
2nd problem. Car will run fan on hwy but, will over heat when in stop and go traffic. I can't find any leaks once car over heats it won't restart for 3 to 4 hrs later. Replace thermo stat and coolet level is fine car will take about a qt after overheat.
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Monday, April 25th, 2011 AT 1:27 PM

11 Replies

Tiny
CADIEMAN
  • MEMBER
PUSH THE OFF AND WARMER BUTTONS ON THE INFORMATION PANEL. WHEN ALL SEGMENTS LITE RELEASE AND WRITE THE CODES DOWN. WE WILL BE HERE.
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Monday, April 25th, 2011 AT 4:42 PM
Tiny
CALVIN MCCOY
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Here are the codes.(H)equal History. PC0113H - PC0131H - PC0151H - PC0171H - PC0174H PC0300H - PC1111H - PC1381H = PC1599H - PC1626H -NO IPC - AC1340H - AC1341H - AC1348H - RS0015H - IR1740H. NO SDM CODES - NO TCS CODES - NO PZM CODES - NO CCP CODES - NO RFA CODES AND PCM?
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Monday, April 25th, 2011 AT 5:35 PM
Tiny
CADIEMAN
  • MEMBER
You will have to clear the codes to narrow it down. The low fan button is no and the high fan button is yes. After it cycles through the computers its going to stop on pcm?You want to hit the high button to enter the pcm. Then hit the low button till you see clear pcm codes. Then push off and high buttons and u will see it flash repeat through all computers. The hard codes you cant clear.A history code started as a hard code. Then come back kk
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Monday, April 25th, 2011 AT 6:23 PM
Tiny
CALVIN MCCOY
  • MEMBER
Cadieman: I have cleared the codes.2 wouldn't clear. RS0015 Current and IR1740 History.
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Monday, April 25th, 2011 AT 7:07 PM
Tiny
CADIEMAN
  • MEMBER
Go to cadillac obd11 codes and reserch those codes ill do the same and get back to u.
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Monday, April 25th, 2011 AT 9:03 PM
Tiny
CADIEMAN
  • MEMBER
Those codes are body codes when the car wont start is it turning over?Does the coolant bubble in the jug with the engine running?
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Monday, April 25th, 2011 AT 10:07 PM
Tiny
CALVIN MCCOY
  • MEMBER
Yes it spins hard and may catch for a sec and may give a small back fire. Sometimes I can get it to start by spraying a quick burst of starter fluid. The jug seems to knock sometime so I think it may bubble. What are Body codes? I looked up the codes and it seems to be problems related to those codes going on. I replaced the 02 sensor twice. If you look at pc 131 and 151.131 says bank 1 sensor1 and 151 says bank 2 sensor1 but they state the location as the same place just before the converter. This is the one I've replaced twice and still getting the same reading the converter is only one yr old.
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Monday, April 25th, 2011 AT 10:21 PM
Tiny
CADIEMAN
  • MEMBER
Those 2 codes wont make it overheat. You need a hydo carbon test because its poss. You have blown head gaskets can cause the overheat and make the overflow jug boil. Check the oil and see if it looks like cream. If your driving the overheated till it quits u probally have cracked the heads.
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Monday, April 25th, 2011 AT 11:29 PM
Tiny
CALVIN MCCOY
  • MEMBER
I thought I may have had blown heads and used Dura Seal. The car runs fine on the hwy. I thought if the heads were gone you would run bad at higher speeds not lower? Could it also be clot purge line or something else stopping good circulation of antifreeze?Also how must does a carbon test cost?
Thanks Calvin
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Monday, April 25th, 2011 AT 11:39 PM
Tiny
CADIEMAN
  • MEMBER
You said the car is overheating and the gauge reads properly. This is impossible. Go to engine data on the information panel, to get coolant temp. Test is cheap at most parts outlets. It sniffs your coolant. If your blowing any type of smoke this is a good sign. You cant driveim till they die with alum. Heads they crack. Ck. Your oil for coolant and your coolant for oil, you will need a rebuilt pair of heads and gaskets. The reason it runs bad because your burning coolant in the cylinders
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Tuesday, April 26th, 2011 AT 12:07 AM
Tiny
CADIEMAN
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I think they call the kit a block test kit under 50 bucks. Google it. Gl
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Tuesday, April 26th, 2011 AT 12:35 AM

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