PA_Spike_King Posted March 27, 2010 Report Share Posted March 27, 2010 This morning when going to camp to do some turkey scouting my 01 chevy truck decided to quit blowing hot air, the temp gauge is normal and the fan works just fine but all that comes out of the ducks is COLD air!! Quote Link to comment Share on other sites More sharing options...
redkneck Posted March 27, 2010 Report Share Posted March 27, 2010 I'd be sure to check the water level pretty quick. I've had them go low enough to not supply the heater core, but still keep the engine at a decent temp. Quote Link to comment Share on other sites More sharing options...
Shaun_300 Posted March 27, 2010 Report Share Posted March 27, 2010 This happened to me a couple times a few years ago, of course in the winter when I was driving back and forth to Ottawa everyday for school and it always seemed to be -20 or colder when it did it. There was a little glitch in the HVAC module. Did you try and hit any buttons? Like A/C, recirculate? When mine screwed up they would not respond, and it would be stuck on Cold air, in the defrost position. All I did was push the clutch in turn the truck off for a few seconds, then fire it back up and keep driving. Quote Link to comment Share on other sites More sharing options...
PA_Spike_King Posted March 27, 2010 Author Report Share Posted March 27, 2010 Shaun, everything seems to be normal but I just can't get heat! Is there something I can smack with a sledge? lol Quote Link to comment Share on other sites More sharing options...
Shaun_300 Posted March 28, 2010 Report Share Posted March 28, 2010 What engine is in that? Quote Link to comment Share on other sites More sharing options...
PA_Spike_King Posted March 28, 2010 Author Report Share Posted March 28, 2010 What engine is in that? 4.8L.........And this winter my Dad's truck did a total 180 (his was stuck in the heat mode) but his fixed itself and I don't know what fixed it. lol Quote Link to comment Share on other sites More sharing options...
Shaun_300 Posted March 28, 2010 Report Share Posted March 28, 2010 Could be the temperature door stuck in the heater case. Grab your heater hoses when your engine is at operating temperature. If both are hot that means the heater core is not plugged. If one is hot and one is cold, the heater core is plugged and that's your issue. If both are hot it's either a faulty temperature door actuator, a jammed temperature door, or a faulty HVAC module. Quote Link to comment Share on other sites More sharing options...
PA_Spike_King Posted March 28, 2010 Author Report Share Posted March 28, 2010 OK, I will check it out tomarrow and let you know. Quote Link to comment Share on other sites More sharing options...
redgreen Posted March 29, 2010 Report Share Posted March 29, 2010 There is a sensor in the dash. Sounds like it has croaked. Cost me about $200,00 to get one replaced, and then things worked fine. Quote Link to comment Share on other sites More sharing options...
PA_Spike_King Posted March 30, 2010 Author Report Share Posted March 30, 2010 Shaun, I just checked the heater core hoses and one is cold so it's headed to the garage soon so thanks for the help. And another thing I have changed the coolent and it only has 79,000 miles so what is plugging the system up? Thanks Man. Quote Link to comment Share on other sites More sharing options...
Shaun_300 Posted March 30, 2010 Report Share Posted March 30, 2010 Yeah it's plugged then, you could have flushed it yourself. Should have told you that in the last post but I was waiting to see what you found. It could be the internal parts of the heater core eroding a bit, also the new dexcool coolant is more corrosive than the old glycol green coolant. For next time, just pull the heater hoses off either the waterpump or the core, it's a nicer job taking them off the waterpump because you have hoses to work with for the flushing. Stick the nozzle of your garden hose in the cold hose and hit the nozzle, you should see a bunch of gunky crap come out of the other hose. This backflushes all the stuff out of it. Switch the nozzle to the other hose and do the same. until it's nice clean water coming out from both ends. Hook the hoses back up and you're done. Quote Link to comment Share on other sites More sharing options...
PA_Spike_King Posted March 30, 2010 Author Report Share Posted March 30, 2010 That's ok, my cousin owns his own garage so this won't cost me much (a few O2 cylinders as I supply his gas for him). And now that everyone is raising their front ends on there chevy trucks I'm going to do the same and just do an alignment while I'm there. LOL Quote Link to comment Share on other sites More sharing options...
Shaun_300 Posted March 30, 2010 Report Share Posted March 30, 2010 Awesome! Good call. Quote Link to comment Share on other sites More sharing options...
PA_Spike_King Posted March 30, 2010 Author Report Share Posted March 30, 2010 I am also suprised that the dexcool is more corrosive than the old green stuff. I would think it would be the other way around! Quote Link to comment Share on other sites More sharing options...
Shaun_300 Posted March 30, 2010 Report Share Posted March 30, 2010 Nope, dexcool sucks. I personally think that's why there's so intake and head gasket problems on newer GM vehicles (3.1L/3.4L in particular) I think the dexcool eats the freakin gaskets right out of them. Quote Link to comment Share on other sites More sharing options...
PA_Spike_King Posted April 7, 2010 Author Report Share Posted April 7, 2010 Well, I took my truck to the garage last night and my cousin and I took the heater core lines off and blew the core out and the one side that was cold was clogged solid. With a few blasts of the garden hose on both sides and a bunch of brown crap WE HAVE HEAT. LOL And I will post of the lift in another thread. Quote Link to comment Share on other sites More sharing options...
Shaun_300 Posted April 8, 2010 Report Share Posted April 8, 2010 That's great Eric! Glad that worked out for you. At least you didn't have to replace the heater core. I think on those trucks you basically have to take the dash out til you can see the firewall, then you can get at them. Not a very fun job. Quote Link to comment Share on other sites More sharing options...
Shaun_300 Posted April 8, 2010 Report Share Posted April 8, 2010 That's great Eric! Glad that worked out for you. At least you didn't have to replace the heater core. I think on those trucks you basically have to take the dash out til you can see the firewall, then you can get at them. Not a very fun job. Quote Link to comment Share on other sites More sharing options...
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