I just replaced the thermostat in my 1997 Blazer. I had some heat while
driving down the road, and almost none while sitting at a traffic light, or
idling. It was a $7 part at NAPA (including the tax) and 20 minutes to put
it in (most of that time was spent trying to dig up the right size sockets).
I decided that for $7, it was worth a shot before I took it in to have my
heater core worked on. Worked like a charm!
That said, I've had to have my heater core unplugged a couple times in this
blazer. From what I've been told, Dexcool (the pink stuff) is known for
being a pain in the blazers. It can crystalize into a sludge that plugs up
heater cores. If that is the case, you might be able to get someone to
unplug your heater core without replacing it.
As for the mode actuator, I don't know what that takes to replace. I'm sure
someone around here can give you an idea as to the amount of disassembly
that is involved with that project.
Go to a radiator shop and have them look at it. Ask them to flush out the
heater core, it may just be plugged with gunk (perhaps someone added
antifreeze to the dex cool).
I had same prob with my 98 a cpl years ago. Dealership wanted $500 (later
said they would pay half since we just bought it from them) to replace the
heater core. $30 later from a good radiator shop, I had heat & it has
worked fine since then.
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I recently found the problem with the heat.It was a broken door in the
heater assy. The door is vac. activated and one of the pivot post was
broken causing the door to jam. The whole dash had to come out to even get
to it. $14 part and $600 labor later I finally have heat. I would advise
anyone having this problem to put in a new haeter core right away to avoid
the aggrivation of having it ripped out again. Hope this helps someone
later down the road
if you locate the two heater hoses going to the heater core
and both of them are hot once the truck is warmed up. You can pretty
much bet the problem is in the dash. Other than the obvious issue with
a leaking core.
Some cars have manual heater doors and others have vacuum operated
doors, and you can really have a hell of a time with "electronic"
some vehicles have a heater control valves that screw up, its in line
on the heater hoses and controls the flow of water to the heater core.
Yea I agree, it you are going to pull the dash you might as well put a
heater core in then, if your car is more than a couple of years old.
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