Re: 2000 blazer little or no heat

[coletrain47]

I have a 2000 Blazer and a few weeks ago I was getting a terrible smell and my window were fogging up. I just spent the last two days replacing my heater core, which was definitely the problem (the old heater core was leaking badly).

Now I am still not getting adequate heat and the windows still fog up, although not quite as bad as before. The engine takes a while to warm up, giving me luke warm heat inside the cabin. Then, the heat goes ice cold, and the engine temp spikes to 230 degrees.

I checked the hoses going into the (new)heater core, and one seems to be a bit cooler than the other.

I am thinking of doing a coolant flush, then changing my thermostat. Any comments or suggestions would be great.

[old_master]

If the heater case is not cleaned out when you replace the heater core, (mop up the old coolant) you'll still have the smell and still get the film on the windshield. Eventually it will go away, but it'll take some time. A new thermostat and "burp" the cooling system will take care of the temp spike. Most likely has an air bubble in the cooling system. When the air is burped out, both heater hoses should be close to the same temp, (too hot to hold with bare hands for more than a few seconds).

[jyount]

I recall when I worked at the dealer it was more than common for the s series rigs to have blend door problems because the vacuum solenoid on the tcase would leak transmission oil into the vacuum system, the heater controls were the first to go usually.