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It might not be the blower motor. It might be the blend doors binding up or the intakes clogged with dirt. Could also be that the ducting is loose or deteriorated and air is coming out other places.

If the temp drops when you are moving and rises when you are stopped it seems it's an airflow problem. In my experience this is a symptom of a bad fan clutch. Or, maybe you're idle speed is set too low? Or maybe you have the incorrect fan? In my experience, if the radiator is blocked it will...

That makes sense, the longer the coolant stays in the radiator the cooler it will become, and, at the same time, the coolant which is spending more time in the engine is absorbing more heat from the engine. I'm sure there's some scientific formula to explain all this heat transfer stuff, but...

Relax, your temps are fine.

I seem to remember something about a "skirt" on the thermostat? Good ones have it but cheap ones don't.

I would not recommend charging your a/c with any flammable gas.

There's one type of oil that will work for either. It might be the one mentioned above. That's probably the safest option.

My '68 Chryslers that were equipped with factory a/c had the "Airtemp" label on the window, but my '76 Newport had a sticker that read something like "Air conditioned by Chrysler service and parts division". I've always wondered if that meant the a/c on that car was installed by the dealer...

I think the 2-groove pulley you have was used in trucks or RV's. We have one on a 440 that came from an RV, but the whole accessory set-up is completely different from what would be in a car.

Oh just to add a comment about the temp "spiking". I had a new thermostat installed in my work car (03 Mercury Sable) and shortly thereafter on 2 separate occasions going up a long steep hill the temp went almost to the top of the gauge, then dropped to normal suddenly and quickly. It's...

I've had a bad radiator cap cause overheating. Also, I think 160 thermostat is too low, 195 is probably recommended. Fan clutch usually causes engine to heat up when sitting in traffic idling, usually engine starts to cool down when going fast, especially coasting down hill. You say it heats...

That has to be a mistake, it makes no sense.

Thanks for the replies. The vacuum push button switch is brand new. I suppose it could be bad right out of the box but is that likely? Also, the blower fan can run when the key is in the "acc" position. I think its only supposed to be able to run with the key in the "on" position. I would...

It's the standard air, not the ATC. I actually have the factory service manual and have been studying that diagram for days. I just can't see what could be wrong. We were planning to get out the voltmeter and try figuring this out, but I figured I'd ask since there are some odd components in...

The heater fan on this car seems to turn itself on and off, accompanied by a noticeable "click". I have already been sitting in the car listening to the radio with the key in the "acc" position and the "off" button pushed on the heater control and I hear a "click" and the fan turns on. Other...