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1999 jeep wrangler heater blows warm, but not hot. Thermastat new,water pump new, water temp at 190.

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Flush the system

Posted on Oct 15, 2010

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1998 jeep wrangler blows out cool air


you can answer the valve question your self. just look, at the 2 hoses
to the heater core. its there, or not.
the 1998 is here.
see cooling and HVAC sections, as i see , (no engine stated)
there is no valve in the engine bay.
page 7-2 , see that?
then see HVAC page.
if hot water flows thru the core. then the dampers are stuck (why takes tests)
car has 3 vacuum servos, they can be watched to see if each works
page 24-38 (chapter 24 hvac, end)

in an emergancy you can force any vacuum servo to do what you want with bailing wire or tie wraps.
force dampers to heat max. no recirc, and what ever direction you want. on cars with no hot water valve, (this car)
they have a heat damper, yours is stuck closed.
the H/C lever, moves this damper, open and closed.
make it so.

Jan 26, 2014 | 1998 Jeep Wrangler

1 Answer

1999 Jeep wragler heater blowing cold air why?


Could be different problems.
The blower uses a resistor to regulate fan speed, the resistor could be faulty.
You would need to know if the radiator is full of coolant and if both heater hoses are getting hot. There may be a temp control valve in one heater hose that is not opening up to allow flow thru the heater core.

Jan 24, 2013 | 1999 Jeep Wrangler

1 Answer

1999 Jeep Wrangler - 4cyl - 5 speed. Where do I start if my heater is not getting hot. Really doesn't get warm. Just blows out cool air. Side note: This is my 3rd winter with this Jeep and it's never...


The temp reading on the dash is a very big clue... Likely the thermostat (at the end of the large top radiator hose inside the metal housing) is stuck open. When that happens, the coolant in the engine never reaches full temp. Not only can that result in a low heat condition but it can also give you poor fuel mileage as the computer always thinks the engine is cold and therefore it adds extra fuel to keep it running.
Replace with a 195 degree(f) thermostat, run the engine (with the heater on full heat) to nearly normal temp, turn it off and wait about three minutes, then re-start and continue filling. Once full, add whatever is necessary to the recovery bottle and close it up and check for leaks.

Dec 09, 2010 | 1999 Jeep Wrangler

3 Answers

I put a brand new heater core, radiator, water pump an thermastat but it still takes forever to blow heat out an then it doesn't get that hot.. what's the problem? my vehicle is a 1995 jeep wrangler 2.5 4...


Could be the heater bypass valve is stuck or the heater core is blocked.
I'd check the heater core first.You may have trapped air in the cooling system or the heater core may be partially plugged up. Engine coolant is delivered to the heater core through two heater hoses. With the engine idling at normal operating temperature, set the temperature control knob in the full hot position, the mode control switch knob in the floor heat position, and the blower motor switch knob in the highest speed position. Using a test thermometer, check the temperature of the air being discharged at the HVAC housing floor outlets.
Temperature Reference
Ambient Air Temperature 15.5° C (60° F) 21.1° C (70° F) 26.6° C (80° F) 32.2° C (90° F)
Minimum Air Temperature at Floor Outlet 52.2° C (126° F) 56.1° C (133° F) 59.4° C (139° F) 62.2° C (144° F)
If the floor outlet air temperature is too low, Both of the heater hoses should be hot to the touch. The coolant return heater hose should be slightly cooler than the coolant supply heater hose. If the return hose is much cooler than the supply hose, locate and repair the engine coolant flow obstruction in the cooling system.
OBSTRUCTED COOLANT FLOW
Possible locations or causes of obstructed coolant flow: Pinched or kinked heater hoses. Improper heater hose routing. Plugged heater hoses or supply and return ports at the cooling system connections. A plugged heater core. If proper coolant flow through the cooling system is verified, and heater outlet air temperature is still low, a mechanical problem may exist.
MECHANICAL PROBLEMS
Possible locations or causes of insufficient heat: An obstructed cowl air intake. Obstructed heater system outlets. A blend door not functioning properly.
TEMPERATURE CONTROL
If the heater outlet air temperature cannot be adjusted with the temperature control knob on the A/C Heater control panel, the following could require service: The A/C Heater control. The blend door actuator.
The blend door. Improper engine coolant temperature

Dec 04, 2010 | 1995 Jeep Wrangler

1 Answer

98 TJ 4.0 Heat and defrost blow cold air


put some card in front of rad ,do you not watch ice road truckers

Jan 09, 2010 | 1998 Jeep Wrangler

1 Answer

Heater blower motor working but not getting any heat, has new radaitor,water pump,thermastat and belt


heater unit needs a flush out with the hose ,reverse flow as well ,if it still doesnt get that hot remove it and fill with a caustic solution .if its that cold outside try the old truckers trick ,put some card in front of the rad 2/3 cover but leave the fan area open

Jan 08, 2010 | 2000 Jeep Wrangler

1 Answer

Overheat and no heat


try either heater core or the fluid needs to be flushed and replaced with new

Jul 20, 2009 | 2001 Jeep Grand Cherokee

1 Answer

The heater will not blow hot or even warm what could it be?


thermastat is bad best way to find out is to put it a pan of boiling water and see if it opens

Mar 16, 2009 | 1998 Jeep Wrangler

1 Answer

1999 jeep wrangler 4.0 liter sport heater problem #2


Make 100% sure before you go and spend more $$$ that (1) you have good coolant flow through the heater core; get engine to operating temp,then with heater fan on high and temp control on full hot carefully grasp heater in and out hoses(i use a in-fared heat gun to diagnose). They should be very close to same temp, if not, core is plugged or if equipped with a flow control valve, its not opening or there is an air lock in system.(2) If coolant flow is good, suspect the hot/cold blend door being stuck in cold position assuming you have good air flow. Its very rare for engine cooling to be ok and heater core coolant flow be bad , caused by a failed water pump! Hope this helps! Please rate me,Thanks!

Jan 18, 2009 | 1999 Jeep Wrangler

3 Answers

Heater blows cold air when idle


Sounds like you may have a partially plugged heater core. You could flush this out separately, from flushing radiator & engine block. Diconnect heater hoses going to your heater core and clamp off, so not to loose coolant from engine. Now hook up separate hose to one side of heater core pipe and flush out with typical garden hose. Repeat procedure on both heater core inlets. Reconnect original heater hoses and test difference. You may have to add an additional litre of antifreeze. If this don't work i suggest changing heater core. Good luck.........Ron.

Jan 03, 2009 | 2000 Jeep Grand Cherokee

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