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I have a 1994 Buick Roadmaster that has heater problems, ...
Sent to Car Experts September 23 06:27 PM

I have a 1994 Buick Roadmaster that has heater problems, When I accelerate the heater shuts off and blows "Cold" air, The only way I can get it to heat is stop,pull off the road,shut off engine for five minute and it will start heating again.
I have ask a lot of people,with no help. I have replaced the Heater Core, Had the radaitor and block flushed, replaced the thermostat. Nothing I have done helped.
"PLEASE HELP"
Thank you
Houston

 

Optional Information:
1994 Buick Roadmaster 350 LT1

Already Tried:
New Heater core,flush Radaitor,New thermostat

Customer (name blocked for privacy)
Status:  Closed   Value: $15
Answer
September 23 7:04 PM (37 minutes and 10 seconds later)
         
REPLIEDCheck Mark
Have you had the cooling system checked for hydro carbons ie,for a leaking head gasket? Is the heater control manual or climate control? If you feel the heater hoses are they hot or cold when this is happening?Does the heat change to out of the defroster when this is happening.

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Frank -- Auto Service Technician -- 100% Positive Feedback on 637 Car Accepts
33 years experience,25 with GM,14 ASE certifications,
Reply
September 23 7:10 PM (6 minutes and 4 seconds later)
         
Reply to Frank's Post: The heater has a climate control on the dash, I can set it on 90 degrees and it's just barely warm.
I have had the system power flushed and checked for leaks ,all OK. What type of watet cantrol valve does it have and where is it located, I haven't found one.
Thank you
Houston
Customer (name blocked for privacy)
Answer
September 23 7:16 PM (6 minutes and 11 seconds later)
         
REPLIEDCheck Mark
Usally if it has a hot water valve its in one of the heater hoses,closer to the firewall.It doesn't have on inside.Are the hoses hot or cold when this happens?
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Frank -- Auto Service Technician -- 100% Positive Feedback on 637 Car Accepts
33 years experience,25 with GM,14 ASE certifications,
Reply
September 23 7:19 PM (3 minutes and 3 seconds later)
         
Reply to Frank's Post: Hoses are hot. Thank you
Houston

Thetre is "NO' Control valve in engine compartment
Customer (name blocked for privacy)
Answer
September 23 7:24 PM (5 minutes later)
         
REPLIEDCheck Mark

I would want to look at the temp door actautor inside the car on the heater box.You have 3 actuators and can watch them move but its hard to see in there and you practiacllt have to stand on your head and remove the glove box.What we have to determine is if its a control problem with the heater or a coolant flow problem thru the heater.



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Frank -- Auto Service Technician -- 100% Positive Feedback on 637 Car Accepts
33 years experience,25 with GM,14 ASE certifications,
Reply
September 23 7:28 PM (3 minutes and 44 seconds later)
         
Reply to Frank's Post: Frank,
Are those doors vacucum opperated or are they tempeture controled?
I have susepcted for some time that I was loosing vacucum when I accecatered that was causing the problem, The Buick Dealer said I had no leaks,I think he is full of crap.
Thanks
Houaton
Customer (name blocked for privacy)
Answer
September 23 7:45 PM (17 minutes and 2 seconds later)
         
ACCEPTEDCheck Mark
There is a vacuum control that with climate control electrically regulated.If the air flow goes to defrost on accel it most defenatly would be a vacuum problem in the supply ,check valve or resevoir-better known as the vacuum ball.The hose are behind the glove box on to the top right.You'll be able to see them.Also look for the vacuum line that goes thru the firewall and follow it making sure there are no cracks or splits.

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Frank -- Auto Service Technician -- 100% Positive Feedback on 637 Car Accepts
33 years experience,25 with GM,14 ASE certifications,
Reply
September 23 7:49 PM (4 minutes and 28 seconds later)
         
Reply to Frank's Post: Frank: This will supprise you I suppose, I am an old man 80+ have been working on autos all my life, this is the first thing in many years I ask anyone for help on.
I beleive you may have helped me so I am going to OK the payment. I would like to meet you sometime. I think you may know what you are tAlking about. I just wonder where you are, I',m in Wartburg, Tenn.
You have a good evening
Houston
Customer (name blocked for privacy)
Reply
September 23 7:58 PM (8 minutes and 33 seconds later)
         
Frank, Thanks for all your help, 'm not sure you got my reply on the last e-mail

Houston
Customer (name blocked for privacy)
Answer
September 24 8:23 AM (12 hours and 24 minutes and 59 seconds later)
         
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Frank -- Auto Service Technician -- 100% Positive Feedback on 637 Car Accepts
33 years experience,25 with GM,14 ASE certifications,
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