Heater Core Replaced, Now Blows Cold Air
I had a leaking heater core replaced on my 99 Winnebago with a Freightliner XC chassis. No more leaks, but now the dash heater only blows cold air. I suspect my local truck repair guy (who knows hea...
Forum Discussion
Thanks for the feedback.
1) I don’t think it’s an air pocket. Since the heater core install, I’ve driven it 100 miles, camped 3 days, and 100 miles back; with no change in coolant level in the reservoir.
2) I let it idle for 10 minutes (engine temp gauge just started to move, so it heated a little). I turned heater knobs on, and felt both hoses at the core. Hoses stayed cold.
3) I talked to the mechanic. He did nothing more than Doug said - disconnected the two hoses, installed the new core, and reinstalled the hoses.
4) When looking at it more closely, I noticed a vacuum box a couple feet away from the core. One house came out of that box (and into the firewall). A 2’d vacuum nozzle (probably incorrect term) from that box was unused. I looked for a loose hose in the vicinity and found none. Does this make sense to anyone?
In pic below, heater core on left, vacuum box on right has two nozzles, upper one has hose, lower one (white) is open.
1) I don’t think it’s an air pocket. Since the heater core install, I’ve driven it 100 miles, camped 3 days, and 100 miles back; with no change in coolant level in the reservoir.
2) I let it idle for 10 minutes (engine temp gauge just started to move, so it heated a little). I turned heater knobs on, and felt both hoses at the core. Hoses stayed cold.
3) I talked to the mechanic. He did nothing more than Doug said - disconnected the two hoses, installed the new core, and reinstalled the hoses.
4) When looking at it more closely, I noticed a vacuum box a couple feet away from the core. One house came out of that box (and into the firewall). A 2’d vacuum nozzle (probably incorrect term) from that box was unused. I looked for a loose hose in the vicinity and found none. Does this make sense to anyone?
In pic below, heater core on left, vacuum box on right has two nozzles, upper one has hose, lower one (white) is open.
