Question about Jeep 2003 Liberty Sport 3.7 V6

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2003 jeep liberty sport overheating and no heat is coming from heater

My husband was driving my 2003 Jeep Liberty Sport around 65 mph and noticed that the heater was not working, he then noticed that the temp was indicating that the engine was overheating. He reduced his speed to around 50 - 55 and the engine temp dropped to about center of the guage but the heater was still not working. He stopped and checked the fluid in the radiator and it was almost empty. He put a 50/50 mix of coolant and water in, started it back up and left the heater on. Again the engine temp started rising as he accelerated. He turned the heater off and kept the Jeep at about 50 mph and got it home, but the engine temp continue to creep to the hot side of the guage. I can discern no leaks in the hoses or radiator which leads me to believe that the thermostat is bad. Does this seem to be a logical conclusion?

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If it is just a fluid issue, the problem is that there is air in the system, and every time air gets to the water pump, it can't pump anything. You need to pull it up on a sharp incline (as close as you can find to 45 degrees, run it for a bit and then turn it around on the hill to force the air out of the system.
HOWEVER, I'd bet that it's the water pump. The water pumps used at that time had plastic impellers, and they disintegrate and little chunks get all through the coolant system. The dealership wanted almost $1,200 to replace it and I had to leave it for a week. I limped down the street to Firestone Auto Care and they did it for $450 in four hours. 50,000 miles later, no problems.

Posted on Mar 16, 2017

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Posted on Jan 02, 2017

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SOURCE: 2003 3.7L Liberty Jeep overheated - no leaks in

thermostats are fairly reliable considering how cheap and simple they are.
They can and do sometimes fail (nothing is perfect). the cause is pretty much that they just stop working, usually because the internal movable part jams.
I believe a company called robertshaw makes what they claim is a "lifetime" thermostat...I doubt if it actually will last that long but may be a slightly better unit to use as a replacement.
I would use the opportunity to check the fan(s) to make sure they are working properly, that the radiator is not externally or internally obstructed and to replace your coolant.
if the overheat condition persists, check (or have checked) to make sure that there are no hydrocarbons in the radiator (indicates a cylinder head gasket leak) If your gasket has failed, it needs immediate service or it will cause serious secondary damage to the engine.

Posted on Apr 30, 2010

perkins48
  • 14333 Answers

SOURCE: 2003 jeep liberty

You may have blown head gasket.

Posted on Oct 31, 2012

leighp123
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SOURCE: how do i know if my ignition switch in 2004 Jeep Rubicon is broken?

It is probably the starter motor wiring not making good contact (either the thick wire from the battery or the ground wire on the solenoid. Clean up the contact areas and try again! If you still don't get the solenoid to push the starter gear into position, the solenoid needs to be replaced ormaybe just lubricated with CRC or WD 40 spray!

Posted on Jan 01, 2013

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