Q: 1999 Jeep Wrangler overheating at highway speeds
What could cause Overheating at highway speeds. Already replaced radiator, thermostat, water pump and hoses
My car has 97000 miles.
My car has an automatic transmission.
Recommended Services
| Car is overheating Inspection | $94.99 - $114.99 | Get a Quote |
Hello. If this only occurs at highway speeds, then you may have pressure build up in the cooling system. This is typically caused by a leaking head gasket. If there is a slight leak, then combustion pressure will build up in the cooling system and cause this to occur. A block test would need to be done to verify this. If you want to have this looked at before throwing on any more parts, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the overheating issue and verify what needs repair.
The statements expressed above are only for informational purposes and should be independently verified. Please see our
terms of service
for more details
Get an instant quote for your car
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
What others are asking
How can I get a replacement key?
You can get a key for the vehicle at a dealer or a locksmith, just be sure that it's a PASS-key III+ which is denoted by a plus symbol in a circle. These keys are coded and must be learned...
AC blowing warm air
Hi. The problem your described is an indicator that the coolant fan for the condenser is not working properly. If the fans are working properly, I suggest having the refrigerant pressure check by an EPA certified technician. If you need...
Gear shift lever broke
This is something that would need to be looked at in-person to see what is broken on the gear shifter, and scan the transmission to see what code is stored in it. You may have a complete shift linkage that...
Transmission died
When a transmission fails, the vehicle will seem as though it is in neutral. Sometimes if you rev the engine high it might move slowly. If this is the case of if the vehicle does not move at all, yes...
Car overheats while idling
It sounds like you may have a problem with rust an scale build up in the engine. This build up may have worn the impeller on the water pump and this is why it only overheats at low engine RPMs....
Check Engine Light codes. 2006 Mercedes Benz E55 AMG
Since you are getting many different codes from different areas of the engine, you may need to have the system hooked up to a factory scanner since most of these generic codes do not cross over in my repair software....
brake are making a metal loud noise when I brake.
Hello. The price to replace all 4 rotors, calipers, and brake pads is very close to the price quoted when I used the estimating guide that I use for repairs. The calipers are listed at $246 each, rotors are about...
Spark plug replacement on 2011 BMW 328xi
Your vehicle was equipped with 100,000 mile spark plugs. The first recommended change is at 100,000 miles. If a Diagnostic Trouble Code has led you to test the ignition system and you find that an individual plug over coil tests...
Clunk, Clank, and Throttle.
Check the suspension and steering (https://www.yourmechanic.com/services/brakes-steering-and-suspension-inspection) around the driver side and see if there is anything that could be loose. Look for any bolts or bushings that may be loose or broken. For the engine revving up on the freeway...
Related articles
How to Buy a Good Quality Cooling System Flush
Your Your radiator does the important job of helping to keep the engine cool. Overheating can cause serious, expensive damage like a blown head gasket (which typically requires complete engine replacement) or warped cylinders. The radiator circulates and cools the...
Symptoms of a Bad or Failing Radiator Drain Cock
Common signs include leaking coolant, especially around the radiator drain cock, and threads stripping on the drain cock.
How to Replace a Vacuum Hose
A vacuum hose is failing if the Check Engine Light comes on, the engine does not run smoothly, or the engine loses power and does not start.
Browse other content
Estimates
Cities