Automotive Forums .com - the leading automotive community online! Automotive Forums .com - the leading automotive community online!
Automotive Forums .com - the leading automotive community online! 
-
Latest | 0 Rplys
Go Back   Automotive Forums .com Car Chat > GMC > Yukon
Reply Show Printable Version Show Printable Version | Email this Page Email this Page | Subscription Subscribe to this Thread
 
Thread Tools
Old 11-23-2014, 05:27 PM   #1
wayaboveme
AF Newbie
 
Join Date: Apr 2006
Location: naples, Florida
Posts: 43
Thanks: 0
Thanked 1 Time in 1 Post
2000 Yukon Heat not hot

Vehicle: 2000 Yukon SLT 4.8L Std heat controls, no diff betw passenger and driver. 3 knobs - L to R Fan, temp (just blue to Red, not in degrees) and far rt is moving the airflow around from feet to defrost.

Problem: Got a little cold here in FL last week and turned heart on. No go. The overhead is actually a little bit warm but nothing to write home about. Over the past year, I was hearing an occasional thumping in passenger dash but figured I'd deal with it when something broke. Still don't know if that was the problem.

So, I decided it might be the heater Blend Door Actuator. Removed the panel under glove compartment and also the center console. Took actuator off. Fussed with it a bit and plugged it back in and started the engine. I then moved the middle temp knob from cold to hot and the actuator moved from left position to rt position but I was unable to make it move again after this. unplugged it, plugged it back in, removed battery cables and HVAC fuse for 5 minutes, etc. With it off, I reached up and was able to easily rotate the spindle that opens/closes the door. I finally gave up and bought a new actuator from Auto Zone. Installed it and turned engine back on. The temp control now activates the actuator and opens/closes the door. Done deal right? Wrong! Still no heat!!

Temp gauge sits at about 200 F on the truck. 1 year ago had new radiator installed. 2 years ago had new t-stat installed when the new water pump went in.

Thoughts anyone? I'm thinking it might be the air bubbles I'm reading about in the heater core but unsure. Could it be anything else? I don't have any significant loss in fan pressure anywhere if that makes a difference.

Thanks!!
wayaboveme is offline   Reply With Quote
Old 12-11-2014, 03:23 PM   #2
Cusser
AF Regular
 
Cusser's Avatar
 
Join Date: May 2004
Location: Phoenix, Arizona
Posts: 358
Thanks: 0
Thanked 3 Times in 3 Posts
Re: 2000 Yukon Heat not hot

On my import truck, I got much more heat when I replaced the non-standard 180F thermostat with a standard 195F one.

Yes: bleeding out all the air from the cooling system is also important.
Cusser is offline   Reply With Quote
Old 12-11-2014, 04:03 PM   #3
wayaboveme
AF Newbie
Thread starter
 
Join Date: Apr 2006
Location: naples, Florida
Posts: 43
Thanks: 0
Thanked 1 Time in 1 Post
Re: 2000 Yukon Heat not hot

So I took it to my guy at Tires Plus and he carefully flushed out the heater core. Done deal. Immediate heat and heater core didn't start leaking. I wouldn't be surprised that some of the stop-leak I put in years ago for the radiator ended up in the heater core and was just blocking things up.

Thanks to Cusser for the response too. Appreciated!
wayaboveme is offline   Reply With Quote
 
Reply

POST REPLY TO THIS THREAD

Go Back   Automotive Forums .com Car Chat > GMC > Yukon

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 01:23 AM.

Community Participation Guidelines | How to use your User Control Panel

Powered by: vBulletin | Copyright Jelsoft Enterprises Ltd.
 
 
no new posts