Wrangler heater blows cold air at stop light

Maintenance/Repairs
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1

I have a 92 Jeep Wrangler. When the heater is on and the Jeep is moving it blows hot air.

But when I stop at a stop light, the heater eventually starts to blow cold air and the temp. gauge starts to creep up.

When I start to move again, everything goes back to normal.

And sometimes it does it when I am going really slow (5mph) but will stop when I speed up.

Any ideas and is this going to be super expensive?

2

Check your coolant level. If it is low refill and you may need to burp the system. That means removing any trapped air. Hope this helps.

3

Yep, check for low coolant!!