'05 Escalade NO HEAT!

scott367 · #1 (**permalink**) 10-28-08, 06:50 PM

Yesterday The heat went out in my '05 escalade. No air blows when the heat or AC is on. If you start driving fast hot a little hot air will be blown through the heater core into the car, but not enough to heat the car. Looks like the fan is bad. Any suggestions? I checked the fuse marked "Blower" it is good - is that even the fuse that goes to the fan?

umoms · #2 (**permalink**) 01-12-09, 11:49 AM

i have a similar problem. Did you ever figure this out?

scott367 · #3 (**permalink**) 01-12-09, 11:52 AM

I did figure it out. First off, check the rear heat. Mine worked fine, it is a seperate blower motor. Then I pulled the blower motor out, it's very easy to do. And I hooked it up to the battery and it worked fine, after that I found that the blower motor control unit was bad.

umoms · #4 (**permalink**) 01-12-09, 12:20 PM

My rear works fine..What do you mean by control unit? The control in the dash? Or do you mean the resistor? Where is that located

scott367 · #5 (**permalink**) 01-12-09, 12:26 PM

I have no idea how mch it would cost to get the dealer to replace it. I went to the dealer and paid $120 for the part. It goes under the passenger side dash. Pretty easy to get to.

redsoxnation5 · #6 (**permalink**) 01-18-09, 03:35 AM

I have a similar problem, except there's no heat in the rear as well. So where's the blower motor and how can I get it out?

scott367 · #7 (**permalink**) 01-19-09, 10:47 AM

Your problem is different, there are two seperate blower motors. It is highly unlikely that they both went bad. Try to turn the rear heat on from the front, then try to turn the rear heat on from the beack seat. If those don't work, I don't know, it might be an HVAC control unit.

scott367 · #8 (**permalink**) 01-19-09, 10:55 AM

UMOMS - There are no resistors in the system, there is the HVAC control unit, that is the thing with the display in the dash that you turn the air on from. It is possible that is bad. Then there is also a Blower Motor control unit which is mounted right by the fan. It is a little black box that controls the speed of the fan. The escalade is a lot more complicated then a typical car that just has power comming out and resistors to adjust the speed of the fan.

smartmoney · #9 (**permalink**) 01-21-09, 01:05 PM

My 04 has had the blower fan stop for both the heat and AC. I removed the black panel under the glove box and have tapped the blower motor with a rubber mallet as suggested in other posts regarding this issue, however this doesn't work.

When I turn on the heat there is a constant clicking coming from the blower motor like its trying to open the vent or something but I've had no luck.

Any suggestions?

scott367 · #10 (**permalink**) 01-21-09, 01:08 PM

Pull the fan out, it is very easy to do. I think there is one screw holding it in. Then you just twist the whole fan and it comes out. Then hook the fan directly up to the battery. See if the fan spins. Carefull doing this though, make sure your holding the fan tight while you apply power. I tried this with the fan sitting on the engine and when the fan started to spin it shot across the engine.

smartmoney · #11 (**permalink**) 01-21-09, 07:29 PM

I got the fan out, there actually was no screws. I also removed the small black rectangle with the two small silver plates coming out of it that is connected by two wires (purple and black).

I cut those wires (leaving room to resplice them) and connected each lead from the connector on the fan to the battery and the fan worked fine.

Is the small black rectangle with the two leads what needs to be replaced?

Thank-you.

smartmoney · #12 (**permalink**) 01-22-09, 03:14 PM

Thank-you for your help. I replaced the little black rectangular module next to the blower and now everything is back in good running order.

I found it online for $60.00 plus shipping, called the local Cadillac dealer, they wanted $120.00 and wouldn't reduce the price, called the local GMAC dealer and they gave it to me for $90.00 including tax.

Also found in this forum how to shut up the voice that says "phone Unavailable". I just unplugged everything in the Onstar module behind the glove box (4 Connections) and now she's gone. Everything else still works fine.

Great Forum ! Glad I fixed it myself. Thanks again.

scott367 · #13 (**permalink**) 01-22-09, 03:35 PM

Glad my problem could help, I got the part from my local dealer for $120, I found it online for $90 but it was used. It is a common part that goes bad, so I figured just get it right away and pay $30 more.

This whole fix could have easily been 2 hours trouble shooting + 1 hour to replace the part + $120 for the part. You probably saved yourself 3 - $400.

satorifound · #14 (**permalink**) 01-22-09, 09:56 PM

Mine blows, but takes FOREVER to heat up. The rear heat blows too, but takes forever to heat up, if at all. Is it just slow when it is cold? I can warm the car for 20 minutes and it is still freezing when I get in.

scott367 · #15 (**permalink**) 01-23-09, 10:58 AM

You have a completely different problem. I would try to drain all the coolant, then run the car with the coolant flush stuff in it. Then fill it back up with coolant. If that doesn't work, maybe the heater core is bad.

After the car is running for 20 min what does the temp gage read? It might just be the whole engine is not heating up because the thermostat is stuck open.