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03-06-2018, 12:26 PM | #1 | |
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Join Date: Jun 2004
Location: Rocklin, California
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heat, no heat, burping the coolant
I see a few of us have had this problem: no heat at idle or low rpms, heat is ok when the rpms are raised to at least 2500-3000. Most of you have replaced components like the water pump, T-stat, or tried things like flushing the heater coil and hoses (a commonly recommended solution). But the cheapest, and maybe the most logical seems to be from J cAT to simply "burp" the cooling system via the expansion tank. Sadly, after his suggested repair, NO ONE HAS RESPONDED TO SAY WHETHER IT WORKED OR NOT .
My 2005 1500LT with 121,000 miles has developed the same problem. The whole pump, T-Stat, belts and all were replaced at 97,000 miles for the exorbitant cost of over $650 (my wife was stuck 600 miles away on a Sunday). We have not had any heat or a/c issues at all until this past winter. The issue is the same as the other posters: no hot air at idle, warm or hot air when rpms are raised to 2500+ rpms AND HELD. Air blows cool again if the rpms drop below 2000-2500+. My first repair response was to check the "heater control valve", which this burb DOES NOT HAVE (no matter what the parts houses say). So, at this point I'll try J cAT's solution. I will give a response with what happens afterwards.
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2004 Yukon XL Denali Luxo-barge for towing. 6.0L AWD grandpa hauler 2005 Suburban 1500LT/awd/tow/everything else...soccermom cruiser 2008 Nissan Versa HB...wife's skateboard 1997 Jaguar XK8 convertible...best road car ever 1966 Mustang GT convertible...fully restored concourse show car |
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03-06-2018, 04:35 PM | #2 | |
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Re: heat, no heat, burping the coolant
yes the air purge procedure can fix it ... sometimes a very small leak can cause this or changing the coolant ..
if they do not reply doing this procedure , then they fixed it .... |
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03-08-2018, 10:45 AM | #3 | ||
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Re: heat, no heat, burping the coolant
Quote:
I'll know better after I go buy some more coolant and fill the tank to proper level.
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2004 Yukon XL Denali Luxo-barge for towing. 6.0L AWD grandpa hauler 2005 Suburban 1500LT/awd/tow/everything else...soccermom cruiser 2008 Nissan Versa HB...wife's skateboard 1997 Jaguar XK8 convertible...best road car ever 1966 Mustang GT convertible...fully restored concourse show car |
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03-08-2018, 12:10 PM | #4 | |
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Re: heat, no heat, burping the coolant
clean up the plastic pressure tank use a pool cleaner .. for vinyl .. then keep checking when cold on level ground for continued loss of coolant.. this may be the water pump gaskets .. try to tighten the WP bolts...
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The Following 2 Users Say Thank You to j cAT For This Useful Post: |
mishalah (03-14-2018)
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03-09-2018, 06:23 AM | #5 | |
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Re: heat, no heat, burping the coolant
I would go to Auto Zone or Advanced Auto and get a loaner pressure with the system full put about 12 psi on the gage. Leave it on for a few minutes look for leaks. If nothing is noted start engine if the pressure gage pulsates look for a head gasket leak.
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The Following User Says Thank You to rhandwor For This Useful Post: |
mishalah (03-14-2018)
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03-14-2018, 01:54 PM | #6 | |
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Re: heat, no heat, burping the coolant
I haven't seen any evidence of a leak on outside surfaces, so I might just do the pressure test....in case. Thanks
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2004 Yukon XL Denali Luxo-barge for towing. 6.0L AWD grandpa hauler 2005 Suburban 1500LT/awd/tow/everything else...soccermom cruiser 2008 Nissan Versa HB...wife's skateboard 1997 Jaguar XK8 convertible...best road car ever 1966 Mustang GT convertible...fully restored concourse show car |
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03-14-2018, 01:57 PM | #7 | |
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Re: heat, no heat, burping the coolant
I'll check those. I did fill the tank to the proper level and give the heater a try, but it wasn't very cold outside, nor did I drive the Sub anywhere to check what it does on the road -- yet. But, so far it seems to work properly.
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2004 Yukon XL Denali Luxo-barge for towing. 6.0L AWD grandpa hauler 2005 Suburban 1500LT/awd/tow/everything else...soccermom cruiser 2008 Nissan Versa HB...wife's skateboard 1997 Jaguar XK8 convertible...best road car ever 1966 Mustang GT convertible...fully restored concourse show car |
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