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#1 |
Registered User
Join Date: Jun 2013
Location: SW MO
Posts: 116
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A different kind of "No heat" conundrum
Ok, I have searched Google and this forum and have not seen anything that closely resembles my current heat problem. I will lay out the basics:
New radiator New thermostat (180 degrees) New water pump Heater core has been boiled and pressure tested No leaves or any other obstruction in the heater box Engine warms up normally, sticks to 180 like glue after the thermostat opens the first time. The hoses are hooked up correctly. No matter what, there is not ANY heat coming from the heater core. I just get cold air in the cab. The supply line is kinda warm and the return line to the water pump is cool. I checked for air lock and there was no problem. Now, the heater used to work just fine. I even burned the heck out of my hand on accident one time by letting my hand rest on the heater core pipe when I was leaning over into the engine compartment... ![]() My guess is that the new water pump is possibly the culprit. I think that it is not sucking the water through the core and back into the pump. Anyone else ever have any experience in this problem? I am going to install a new pump possibly tonight and see how it goes, but I just wanted to see what you all had to say. Thanks! (Hope everyone has a safe and happy Thanksgiving!)
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1965 C10 LWB SBW, 292, SM420 1963 Chevy II SS 1951 Chevy Business Coupe Gasser 1949 Willys Overland |
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#2 |
Registered User
Join Date: Dec 2009
Location: Carolina Coast
Posts: 582
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Re: A different kind of "No heat" conundrum
When it gets hot with the radiator cap off can you see the water flowing ? It does sound like the water pump is not pumping...
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_____________________________________ 66 C10 shortbed stepside KEEPER 66 C10 longbed stepside SOLD 69 C10 shortbed stepside SOLD 71 C10 custom deluxe long fleetside SOLD _____________________________________ |
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#3 |
Registered User
Join Date: Jun 2013
Location: SW MO
Posts: 116
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Re: A different kind of "No heat" conundrum
Yeah, I can see it moving slightly after the thermostat opens. But maybe it isn't moving it enough. Can never tell with these dang overseas replacement parts today.
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1965 C10 LWB SBW, 292, SM420 1963 Chevy II SS 1951 Chevy Business Coupe Gasser 1949 Willys Overland |
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#4 |
Registered User
Join Date: Dec 2009
Location: Carolina Coast
Posts: 582
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Re: A different kind of "No heat" conundrum
Does the flow speed up as you speed the engine up...as the rpm's go up the water flow should speed up when looking in the radiator when the temp is up...
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_____________________________________ 66 C10 shortbed stepside KEEPER 66 C10 longbed stepside SOLD 69 C10 shortbed stepside SOLD 71 C10 custom deluxe long fleetside SOLD _____________________________________ |
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#5 |
Registered User
Join Date: Jun 2013
Location: SW MO
Posts: 116
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Re: A different kind of "No heat" conundrum
That is definitely something I will look for tomorrow. If the rate of flow doesn't pick up, then I bet that will almost guarantee that the pump is at fault.
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1965 C10 LWB SBW, 292, SM420 1963 Chevy II SS 1951 Chevy Business Coupe Gasser 1949 Willys Overland |
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#6 |
Registered User
Join Date: Jun 2013
Location: joshua tree ca.
Posts: 1,484
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Re: A different kind of "No heat" conundrum
was it working before water pump change? do you have V belts? and we are talking small block?
Last edited by jtrichard; 11-27-2013 at 10:20 PM. |
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#7 |
Registered User
Join Date: Sep 2012
Location: Dallas, GA
Posts: 1,497
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Re: A different kind of "No heat" conundrum
Is it possible that the flow through the heater core is restricted? Maybe there's a rat nest in there or something.
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#8 |
Registered User
Join Date: Feb 2013
Location: Sapulpa Oklahoma
Posts: 197
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Re: A different kind of "No heat" conundrum
A friend of mine 66 would not heat after changing the heater core. It was air locked. He pulled one hose loose and started motor. Pushed the air out and it worked fine .
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#9 |
Registered User
Join Date: Jun 2013
Location: joshua tree ca.
Posts: 1,484
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Re: A different kind of "No heat" conundrum
if you have V belts you may have been sold a water pump for a later engine/truck with serpentine belt a friend of mine a few months ago ( summer in the desert) bought a 1988 3500 with a 454 and drove it from the sales lot about 5 miles and the temp was red lining come to find out someone had put a serpentine belt water pump on a V belt drive engine don't pump much water when its turning backwards
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#10 | |
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![]() Join Date: Mar 2005
Location: apple valley, ca
Posts: 2,670
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Re: A different kind of "No heat" conundrum
Quote:
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#11 | ||
Registered User
Join Date: Jun 2013
Location: SW MO
Posts: 116
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Re: A different kind of "No heat" conundrum
Quote:
I think maybe the return at the pump either isn't drilled through all the way or there just isn't enough suction to pull the water back through the core. Quote:
Gonna probably work on it this afternoon after I have successfully glutted myself on turkey and pumpkin pie! ![]()
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1965 C10 LWB SBW, 292, SM420 1963 Chevy II SS 1951 Chevy Business Coupe Gasser 1949 Willys Overland |
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#12 |
Registered User
Join Date: Dec 2009
Location: Carolina Coast
Posts: 582
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Re: A different kind of "No heat" conundrum
Did you ever get heat inside the cab?
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_____________________________________ 66 C10 shortbed stepside KEEPER 66 C10 longbed stepside SOLD 69 C10 shortbed stepside SOLD 71 C10 custom deluxe long fleetside SOLD _____________________________________ |
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#13 |
Registered User
Join Date: Jun 2013
Location: SW MO
Posts: 116
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Re: A different kind of "No heat" conundrum
I did! It was late Friday night. I was going to post, but I lost track of time and then forgot to last night when I was on.
I changed out the water pump and decided to get new hoses to replace my cracked out ones. When I was cutting them to fit, I decided to poke around the opening for the hoses. When I put the screw driver in the intake port, it stopped way short. So I grabbed an angled pick and started digging crud out of the port. Eventually removed it from the intake and cleaned it all out and checked the intake for more crud. Long story short, there was blockage at the intake. I imagine this is due to the intake I used was OLD and CRUSTY and probably could have used a good cleaning before I gave it the Krylon touch and then slapped it on a couple years ago. Something obviously broke loose and got lodged. Now the awesome anticipation of it happening again....at least I will know where to look if my heat goes out again! ![]() (But that won't be too long, because I am slowly refreshing the awesome 292 and 4 speed I got from sigshooter. Great guy!)
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1965 C10 LWB SBW, 292, SM420 1963 Chevy II SS 1951 Chevy Business Coupe Gasser 1949 Willys Overland |
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