: 1999 deville almost overheating



delatorre1986
06-19-09, 12:14 AM
Well a friend of mine purchased a 99 deville 169,000 miles on it, it's not losing coolant or slimey tail pipes, checked the purge line flows steady but I noticed that the car will run 196 -199 for about 15 minutes driving, then the temp starts climbing to 222 -226 and goes back down to 213 and starts climbing again. I noticed when he got on the freeway the temp was 192 and he gunned it up the ramp and it and it climbed to 196 and stayed around there. Well we left the car off about maybe 5 hours and I took off the radiator cap and had him idle the car, and stood there for about 15-20 minutes and it didn't overflow until it hit about 217 the coolant started to rise slowly so I put the cap back on. Is this normal? it should boil over within a couple of minutes right? maybe a sticky thermostat or something?

delatorre1986
06-19-09, 12:58 AM
I'm thinking it might not have a thermostat, going to check it out tommorow.

Talamant3z
06-19-09, 01:49 AM
sounds normal to me. n* run warm

delatorre1986
06-19-09, 01:35 PM
It has a thermostat I didn't take it out, but shouldn't the car boil over within minutes without the cap on? not 15- 20 minutes. We went back on the freeway and it was at about 196 he stepped on the gas on a little hill and went up to 213 doesn't sound right.

Talamant3z
06-19-09, 01:57 PM
It has a thermostat I didn't take it out, but shouldn't the car boil over within minutes without the cap on? not 15- 20 minutes. We went back on the freeway and it was at about 196 he stepped on the gas on a little hill and went up to 213 doesn't sound right.

i can tell you from my experience that the temp can jump quick when under load. sounds normal to me maybe ranger or sub can tune in and help out more. overheating would be 255 plus my n* runs 230 in traffic 196 highway. but as far as the coolant not boil over that i dont know 15-20 minutes is a long time haha

Ranger
06-19-09, 03:42 PM
Without the cap on, I would expect it to boil sooner than 20 minutes. Overheating under a load is a head gasket symptom, but 213 is FAR from overheating. In fact, that is normal operating temperature.

tateos
06-19-09, 03:45 PM
Sounds as normal as it gets to me

delatorre1986
06-19-09, 04:10 PM
Well thanks for the help guys I have to go back to his house to help him now because the dummy took out the thermostat out and replaced it. It probably has a big air bubble in the system now.. Yea it is wierd it took that long to boil over.