No heater operation?

When running my heater on the highway my temperature gauge will start going towards cold. When it gets to the C mark the heater starts blowing cold air and the ETC light comes on. I can pull over and stop and let the car idle for awhile and the temperature needle moves back to normal and the air is warm again. But the light doesn't go off until I turn the car off and back on again. It will run OK for awhile and then does it again. Do you know what is going on and what to do about it? Signed cold and confused.

Hi there, my heator stoped working about a week ago and my air conditioner as well, I went and bought a fix it manual and checked the fuses and all seems to be ok, only that no heat and cold air comes out when I turn it on. Its winter and I need the heator but don't want to go to anyone without knowing if it could be an easy fix or at least what I could be looking at with costs! I have been riped off before so at least I want to get an idea. Thank you

My 2007 dodge caravan has no heat. All five speeds on the fan work properly. The heater core has been checked and opened and is ok. Thermostat has been changed. The selector switch for the level of discharge works at all levels. Any ideas

The heater does not work, it blows but does not get warm

I have a 2005 Dodge Grand Caravan, and the heater recently stopped working. It will sometimes work for about 5 minutes or so, but will then blow cold again. Fans are working fine. I also noticed that the engine temp gauge will max out every once in a while. If I turn on the blower for the interior heating system, it will bring the engine temp gauge down very quickly.

Are these two system interrelated? Is it possible that I just need a coolant system flush or does it sound more involved than that. I'd like to try the simple fix that I can do myself before taking it to a shop if possible.

Any advice is appreciated.

I have the identical vehicle and problem. What was the fix? Was it the thermostat?
Thanks.
Jon

Mechanic says the water pump is leaking coolant. So, I'm getting it replaced tomorrow.

Thanks. They filled it w/ coolant so I could drive home. I do now have heat. I only filled the reservoir, not from the top of the radiator. It was near the max level when I did that, but might have dripped out before the next time I drove it. I'll do the flush, but will do the thermostat myself. They also said the serpentine belt had coolant on it and suggested that be replaced. I bought a new one at Napa and will do that myself too. YouTube video shows how to do it. Doesn't look too tough.

Thanks.
They quoted me $323 total to do the water pump. $94 for the water pump, $193 labor plus coolant. I bought a new water pump (lifetime warranty) at Napa for $40.82 that they agreed to install for the labor. That labor is a little higher than other places I called, but they took the time to diagnose the problem and put some coolant in so I could drive home. And, any separate coolant cost is removed b/c I'm doing the radiator flush ($84), which includes the coolant.
I bought a serpentine belt for $23 at Napa. Their quote is $70.91 for the belt and $96.50 to install it ($167.41 total). I'm looking at their printed quote now that details everything. Based on what you just told me, that seems ridiculous. And, if they are taking off the serpentine belt anyhow and putting it back on, it makes me even more skeptical if not ****ed that they quoted $167.51 for a new one.
I specifically spoke to the mechanic who said he didn't see any problems w/ the tstat. I haven't bought that yet and don't plan on replacing it unless a new problem happens.
They've done some work, so I don't want to walk away w/out anything for their time, but they also seem high so I'm minimizing my cost and experience w/ them. They have 3 service centers in this area, have been around for awhile, and are reputable. They're entitled to make a profit, but the price differences on the belt and water pump are too big. The Dodge dealership even quoted me a lower price on the water pump ($84) and labor ($170). I told them and they were surprised the dealership was less than they were, but they weren't willing to lower their price. I also told them the price of the Napa water pump. They thought it must be remanufactured, but it's not and I told them that too.
Again, thanks.

Joe.
I innocently asked about the serpentine belt if they took it off to clean it when they replaced the water pump. The service advisor at the front desk said no that they had a small tool that clamps or wraps on it to clean it. But, maybe he was wrong. I'll give him the benefit of the doubt. He didn't do the repair.
When I watched the YouTube video to replace the serpentine belt, it looked like it took about 10-15 minutes total w/ explanation and everything. So, yeah, $96 to replace it when they were already working on the van in that same area of the vehicle seemed way too high. And, $70 for a belt that was $23 at Napa?
Boulder, CO, is generally a more expensive place to live, but this was out of whack regardless.
Thanks.