A/C works great. Went to defrost the windows this morning but no hot air would come out only cold. Tried the heater again when the truck was at warm and again no hot air only cold. Whats the deal, any ideas or help is appreciated.
Thanks

 

Check the coolant level. If you haven't had the truck long, the previous owner may have done an a.c. mod. by putting in a cutoff valve in one of your heater hoses so the a.c. would work better. Check under the hood for any valves in the heater hoses. I have to go to work but maybe someone else will chime in also.

 

You needed the heater in Belton today?? Up here in Dallas, I drove with the windows open the whole way to work for the first time in a while.

My truck seemed to take FOREVER to heat up last winter -- this was right after I bought it. The dealer changed the stat & temp sender (needle never moved off "C" even after I did get somewhat warm air). I think it was stuck open and it was VERY cold up here when I got it...

Joe

 

its not cold down here, just needed to get that dewy haze off the windshield. the heater worked last year just didn't work today and was wondering why. i've had the truck for little over 2yrs and heater has worked fine but not now. could it be in the switch or something?

 

Do you have the fancy Climate Control or the standard one? In my case, it was the 'stat being stuck open that caused the truck to not warm up. With standard controls, the heat is controlled by the blend door. It simply closes off the heater core bypassing it when you want less heat and opens it when you want more. I had the issue with defrost because the AC compressor is on and all the air always goes through the evaporator. When I tried to run defrost it was very cold because it was already very cold outside, the compressor was on, and the thermostat in the engine was stuck open. You may have the same problem. Try the heat only or vent after it's warmed up -- if it's any warmer, that may be it. Also check the hoses going to the core and the radiator. The radiator on our trucks is very over-sized to handle towing and such. Unloaded with stuck open 'stat it will probably never warm up fully.

If you're going to replace it, you might consider going with the 203* 'stat & billet housing (Bob has them on his site: http://www.dieselsite.com). That's what's going in mine when I install the coolant filter.

Joe

 

i just have the standard a/c, not the fancy one. i don't know if the 'stat is stuck open the engine warms up, needle on the gauge is in the middle so i assume its working.

 

That temp gauge is a joke. I happened to have both a bad sender and a stuck stat, so mine didn't move. The temp gauge reads "normal" once the temp gets over a certain point, but that doesn't mean it's fully warmed up. It's just like the tranny & oil pressure gauge where it reads "C" when cold (or low when below some really low number for the oil pressure gauge), normal in a HUGE range of temps or pressures in the exact same spot, and doesn't show hot until it's almost too late, if not too late already.

Check the hoses and see if they're as hot as they should be. It sux that Ford did that to us on the gauges -- pretty much makes them 3-stage idiot lights. GM at least puts real gauges in. I plan on adding a real coolant or oil temp gauge in the near future just to be able to keep an eye on that.

Joe

 

didn't realize the gauges were that bad, guess another gauge will be in the near future for me too. i'll check everything over today and get back with ya. thanks joe

 

You got it man!! Hope it works out to be something nice & easy.

BTW, unless you have a different filter than the rest of us, check your sig -- should be 6637, not 6636.

 

good typo catch...lol

 

well the hoses seemed to be hot when touched. when i felt them this weekend after about a 30 mile trip and outside temp around 90, i tried the heater and cool air came out. what else should i look for that would not allow heat to come out when heater is selected.

 

Well, it could be the control going to your blend door. I haven't gotten into mine, but I would try following the cable from the **** to where the blend door is to see if it's actually moving. I'm not sure if you can see it in there anywhere or not. Are the hoses going to your heater core hot as well? Especially up where it goes through the firewall? I would guess yes, but just making sure...

If it ends up being your blend door, I don't envy you because it may require pulling the entire plenum out, which means pulling the dash. Yuck...

Joe

 

well really not what i wannted to hear, but i'll give it a try and look to make sure. hopefully i don't have to take her to the stealership.

hey thanks for you input Joe!!!