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I’ve been fighting most of the fall and winter with the cooling system and heater core on my 97 K1500 Silverado, 5.7 manual with 133K on the clock. Around end of summer, I swapped out the water pump (with the help of Eric’s 98 Tahoe video) because of bearing noise. I flushed and refilled the coolant. After the weather cooled down, I noticed the truck wasn’t heating up well, so I changed the heater core. A month or so again the new WP (ACDelco) started leaking, so I pulled it back off and replaced the included gaskets with Fel-pros, which seems to have taken care of that leak. Got one of those no-spill funnels and bled the system. Was getting a leak where the overflow tube meets the radiator, but eventually got the temp in the cab to about 100F. The next day it was back to not putting out heat.
Then last Tuesday the lower radiator hose slipped off on the water pump side while I was parking in town. (That’s what I get for trying to parallel park on a hill on poorly snow-cleared streets.) Anyway, I ordered a new hose and t-bolt clamps to replace the worm-gears I had put on when I did the pump the first time. I changed those out this afternoon and checked the thermostat, which I had to pry off of the housing because it was frozen and maybe stuck closed. I refilled and re-bled the cooling system (still leaks at the overflow tube when full). Thermometer in the vent read 102F when I took it out for a test drive.
On the highway not 10 minutes later, the heater started blowing cooler air again. Checked the thermometer, which now read 76-77. Overheat is gone and t-stat opens as it should, but at this point, I’m totally flummoxed by the heater. There’s low air flow coming from the vent to begin with, even though the blower fan has all speeds, and I can hear all the actuators and the high speed resistor engage with a stethoscope, and it just won’t hold heat. I suck at all of this, and I don’t know what I’m doing wrong. I want to like this truck, but it’s getting harder and harder to. Does anyone have any suggestions? And sorry that I’m always long-winded with these posts.
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