Newkid Posted February 13, 2012 Report Share Posted February 13, 2012 i have a 77 K/C 620 and the heater is only blowing kinda warm air not the hot air im looking for....so do i need to replace the heater core? Quote Link to comment
datrat77 Posted February 13, 2012 Report Share Posted February 13, 2012 No. Clean the damn thing. It's probably trashed. 4 clips hold the cover on.... Take the cover off and shopvac that ho. Like so, yo. Quote Link to comment
ggzilla Posted February 13, 2012 Report Share Posted February 13, 2012 There are two common reasons why a heater will blow lukewarm air: 1. Engine is not running at correct temperature. Measure with heat-reading gun, or put your hand on the upper radiator hose. It should be too hot to leave it there. If it's not up to temp (170-190) degrees, replace the thermostat with a 190 degree unit. 2. Cold air is mixing with the hot. Verify that the air door in the heater system is fully closing. The heater may be bypassed under the hood, in which case it will blow cold (not lukewarm) air. Trace the heater hoses and verify that they go through the firewall. Quote Link to comment
Newkid Posted February 14, 2012 Author Report Share Posted February 14, 2012 No. Clean the damn thing. It's probably trashed. 4 clips hold the cover on.... Take the cover off and shopvac that ho. Like so, yo. when i pulled that cover that thing was full of leaves and dirt!! thanks for the tip Quote Link to comment
ggzilla Posted February 14, 2012 Report Share Posted February 14, 2012 Let us know if cleaning out the leaves and dirt makes it blow different temp. Quote Link to comment
Radiant-Designer Posted February 14, 2012 Report Share Posted February 14, 2012 On mine I found out that the valve wasnt being moved all the way. On the passengers side you can find it by tracing the heater hose and making sure the valve moves freely when you move the heater controls Quote Link to comment
datzenmike Posted February 14, 2012 Report Share Posted February 14, 2012 Remove leaves and obstructions, check the control cables are moving the heater hot water valve and the flap door that seals off the cold air by pass. The thermostat may be too cold or more likely stuck partly open and running the engine cool. The foam rubber surrounding the core can rot away and allow cold air to leak around it too. Also open the valve and disconnect the two hoses out at the motor ends. Get a garden hose and flush the core in both directions. Keep flushing until the water runs clean. I did this once on my 620 and a bunch of hot chocolate shit came out with what looked like dead flies in it. I think someone ran some of the Bar's Leak pellets in the rad to stop a leak. Naturally it migrated to the heater core and settled there. Quote Link to comment
flatcat19 Posted February 14, 2012 Report Share Posted February 14, 2012 Could have an air pocket in the cooling system. Burp. And repeat. Quote Link to comment
Eagle_Adam Posted February 14, 2012 Report Share Posted February 14, 2012 Could have an air pocket in the cooling system. Burp. And repeat. how would you go about burping it? - jack it up and run it? Quote Link to comment
datzenmike Posted February 14, 2012 Report Share Posted February 14, 2012 Air will work it's way up and out the top rad hose as it's pretty much the highest point. If you have a juggle valve the air will self bleed as you fill it. Any air perhaps in a heater hose will move once the water pump starts working and will exit the rad once the thermostat opens. You don't have to park on an incline, just check the rad level every time you start it up cold and top up. Fill and keep checking as you fill. The air will usually gurgle out. Start and idle with the cap off until the thermostat opens... usually the rad levell will suddenly drop... top up again. Check when cold and top up if needed for a few days or untill you don't have to add to it. Quote Link to comment
Newkid Posted February 15, 2012 Author Report Share Posted February 15, 2012 Haven't had a chance to drive it but I drove to school today so I will u guys know when I drive home tonight to see how it goes Quote Link to comment
Newkid Posted February 15, 2012 Author Report Share Posted February 15, 2012 So the bottom door thing doesn't close all the way, I haven't had a chance to check the valve ill do that tomorrow along with the thermostat Quote Link to comment
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