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Disconnect the heater core hoses. You can then use a regular hose with one of those adjustable nozzles on them and spray in one end of the heater core , and let it flow out the other. Alternate between both hoses. I wouldn't recommend using any type of chemical flush beyond cleaning vinegar- and...

You may be right. I would think that with both hoses being within 5-10 degrees of each other that would indicate flow BUT I guess it all depends on how the heater core is positioned in the plenum box. I also own a 93 Cadillac sixty special (a DeVille with rear fender skirts basically) and the...

What about a bad water pump? Like I said it isn't overheating but the radiator hoses are easily squeezed by hand when the car is running- they should be hard from pressure, right?

It's 33 outside and the temp gun says the back of the vent is 47 degrees, so it's barely getting anything. Temp gun also says that the heater core hoses are within 5 degrees of each other and they're around 180. At the coolant temp sensor the crossover pipe sits at roughly 212 at idle. I don't...

Well, my heat problem is back. I'm still seeing idle temps at 212ish and coolant level hasn't dropped any but I have no heat again. Blend door still works. Guess I'm yanking the dash this weekend and tearing into the plenum... It's too damn cold to not have heat. Anything I should do while I...

Now that I’ve got my heat issue sorted out, I’ve got a couple replacement parts on the way for my car and am about to order everything necessary to do the jmod. My main question is this: I know the transmission in the car isn’t the original (came with receipts showing mileage on replacement...

Update: I guess I didn’t burp the system properly! I drained and flushed the system this morning (didn’t see anything funky come out), changed the thermostat and o ring with Motorcraft parts, and have been working the air out all day. I parked the car uphill so the crossover tube was the...

I’m assuming one door controls outside air and the other splits between the evap coil and the heater core. Hmm. My service manual can’t get here fast enough lol I ran the EATC diagnostic and got back only code 155. From the limited info I’ve found online about EATC codes this is related to...

I’ll do that as my next move. What about the actual blend door(s) in the airbox themselves? The one attached to the gray arm I know is still operational (I’ve manually moved it myself and it thuds at both ends), but isn’t there another one attached to that little sleeve that the actuator’s...

Whats up guys, I just purchased a 97 m8 with 109k on the clock, in fairly decent shape (interior is immaculate, clear coat is rough) a couple weeks ago. I’ve been searching for one of these that isn’t beat to death for a while and lucked out. Here’s the issue I can’t figure out- I have VERY...