Question about 1999 Saturn SL
A vacuum leak would appear at all times. If this happens when the weather gets cold, you should be looking at your thermostat and/or temp. sensor. I had to replace both on my car, which solved the high idle problem. First, the temp would take FOREVER to come up, which was caused by a bad sensor. Second, it'd never go above 1/4, which was due to a bad thermostat. The stock thermostats in these cars have an unnecessary rubber gasket that goes bad on the little valve that opens and closes. When it cracks and falls off, it makes for holes where the coolant can leak past. Aftermarket thermostats do not have this unnecessary gasket. Also, replacement thermostats come pre-mounted in a new housing, so there's no need to remove the old thermostat from its housing (difficult--press down on STRONG spring and turn..somewhat dangerous, too).
To diagnose your car, get a meat thermometer. Drive around for at least 15 minutes, if not longer (longer is better). Park car with engine running. Place meat thermometer in overflow tank. Dash gauge should be reading between 1/4 and 1/2, and meat thermometer should read at or above 180 degrees. If thermometer is above 180, but dash gauge doesn't go above 1/4, then sensor is bad. If meat thermometer is below 180 degrees, then thermostat is bad. Also, if dash gauge takes a really long time to come up (longer than 10 minutes), then sensor is bad. Meat thermometer should read above 180 degrees and dash gauge should read between 1/4 and 1/2. Idle won't come down completely until the gauge registers somewhere between 1/4 and 1/2. If the gauge never gets above 1/4, idle will stay quite high.
Posted on Dec 10, 2008
Sounds like you have a vacume leak
Posted on Sep 11, 2008
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Mar 13, 2015 | 1991 Saturn SL1
Dec 10, 2012 | Saturn SL Cars & Trucks
Sep 19, 2009 | 1996 Saturn SL
Jun 13, 2009 | 1996 Saturn SL
Jun 07, 2009 | 2001 Saturn SC
Apr 24, 2009 | 1999 Saturn SL
Feb 01, 2009 | 1993 Saturn SL1
Nov 13, 2008 | 2002 Saturn L-Series
1,930 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: