2003 Jeep Heater blows hot and cold air
 

I have a 2003 Jeep Grand Cherokee. Sometimes my heater blows hot air and
sometimes it blows cold air.
Sometimes it only blows hot air on the passenger side and not the drivers
side. Sometimes I have more heat than I can stand.

We have replaced the fan relay in the front bumper, thermostat and radiator
cap. What do we check next? I have 99,000 miles on it.

Re: 2003 Jeep Heater blows hot and cold air
 

i will bet u have the atc system and u are going to have to pull the dash and
replace the blend air doors housing and motors there is a tsb for this issue

jeepowner wrote:

> I have a 2003 Jeep Grand Cherokee. Sometimes my heater blows hot air and
> sometimes it blows cold air.
> Sometimes it only blows hot air on the passenger side and not the drivers
> side. Sometimes I have more heat than I can stand.
>
> We have replaced the fan relay in the front bumper, thermostat and radiator
> cap. What do we check next? I have 99,000 miles on it.

Re: 2003 Jeep Heater blows hot and cold air
 

i will bet u have the atc system and u are going to have to pull the dash and
replace the blend air doors housing and motors there is a tsb for this issue

jeepowner wrote:

> I have a 2003 Jeep Grand Cherokee. Sometimes my heater blows hot air and
> sometimes it blows cold air.
> Sometimes it only blows hot air on the passenger side and not the drivers
> side. Sometimes I have more heat than I can stand.
>
> We have replaced the fan relay in the front bumper, thermostat and radiator
> cap. What do we check next? I have 99,000 miles on it.

Re: 2003 Jeep Heater blows hot and cold air
 

i will bet u have the atc system and u are going to have to pull the dash and
replace the blend air doors housing and motors there is a tsb for this issue

jeepowner wrote:

> I have a 2003 Jeep Grand Cherokee. Sometimes my heater blows hot air and
> sometimes it blows cold air.
> Sometimes it only blows hot air on the passenger side and not the drivers
> side. Sometimes I have more heat than I can stand.
>
> We have replaced the fan relay in the front bumper, thermostat and radiator
> cap. What do we check next? I have 99,000 miles on it.