My 1999 jeep wrangler is over heating, smoking and losing coolant , I replace the heater core, replace radiator, replace thermostat and thermostat housing still over heating

SOURCE: No heat 1999 Jeep Cherokee

...You need to make sure you have the correct thermostat! Usually, there are 160, 180, and 195 degree therms for this jeep. 195 degree therm should be used no matter what the season. If you have a lower temp therm., you will not get good heat (or any at all) in cold weather. Also, You should flush and fill your cooling system to get any contaminants and/or debris out. Check the heater core...it may be **** at this point!

Paul W

• 404 Answers
• Posted on Feb 05, 2009

SOURCE: The heat in my 1992 Jeep Wangler is not working.

Hi!
It appears we have an Air lock scenario and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.
If persistent boil ups/over attention must made in the cylinder head
or gasket area, or possibly water pump?
Please press the Blue button to appraise my FREE Efforts, Thank You!
Paul 'W' U.K.

SOURCE: 1999 jeep wrangler leaking coolant from short tube

Heater core nozzle is broken off and you will need to replace heater core most likely.

SOURCE: 2000 Jeep Wrangler heater core

When I drive my 2000 Jeep Grand Cherokee I can hear water. I was told to blow out the lines of the heater core with a compressor. Where is the heater core located?

SOURCE: 1996 jeep grand cherokee blower works but no heat

Since your blower is working and it is a heat issue,thats where we'll start,First thing is have you checked the coolant level in the radiator when engine is cold,make sure it is filled to top,next verify you have coolant in reserve ,Start your van and get it up to normal operation temperature,If your heat gauge on the dash works correctly it should be 190 degrees,Now lift the hood and locate the two heater hoses going into the heater assembly at the fire wall,Both hoses should be hot to hold on to,if both are hot and no heat inside your problem will be the blend air door in heater assembly.
if neither hose is that hot you need to replace the thermostat in the engine to get it up to 195 degrees.
if one hose is hot and one is luke warm then the heater core is blocked and to blame. hope this helps you.

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