Why is my '99 Jeep grand cherokee only blowing cold air?

Question

My heater doesnt work at all anymore it only blows cold air. The passengers side used to work but now both blow cold air. What could the problem be

My heater doesnt work at all anymore it only blows cold air. The passengers side used to work but now both blow cold air. What could the problem be

update: ok so i popped the hood and realized almost all the hoses in my car have electical tape on them to join the tubes rather than those brackets most cars have could this have something to do with it

Answer 1

Your heater went out simple as that have some hoses looked at check your anti freeze levels but you might have to get a whole new unit ok good luck

Answer 2

I'd first look at the "door/flap" that diverts air either through the heater core or around it. Follow the linkage to the hot/cold slider on your controls -- by the way, does that feel looser than it did before?

Some cars also have a valve which turns off coolant flow to your heater core. Look for linkage to that.

As other posters said, i'd also check out vacuum lines under your dash and under your hood, and your coolant level. I'm pretty sure it's not the thermostat, but changing coolant and replacing thermostat is periodic maintenance - if you haven't done it, now's as good a time as any. Consider using non-toxic antifreeze... $2 more a gallon, but it won't kill pets, and you can dump it down the drain no problem.

Answer 3

It's your thermostat bud. It sits on the top of the motor. There is a large hose approx 2" in diameter. If you take that piece off and inspect the thermostat you will probably find that it's stuck in the open position.

Answer 4

Vacuum lines sound suspect. Older Jeeps had cables that would open and close valves on heater core lines, but I believe that the later models are vacuum controlled.

Answer 5

them a sats (climate control) about 300 www.northfloridaauto.com all of thier answers are wrong i just did twice