No heat in my car

[Wes Tausend]

Originally Posted by bomelia

Yes, I still have that stupid car. And again, no heat. (98 Grand Marquis). So, I flushed the system, then plugged a water hose into the heater coil and blew water through that while the car was running (somebody here I think suggested I do that). Still, nothing.

Whats left? I could hear no vacuum leak under the dash. The control for temperature is electronic... maybe something has failed on the circuit board? Not sending a signal to move some baffle so the air passes over the heater coil?

Mike

Mike,

"flushed the system, then plugged a water hose into the heater coil and blew water through that "
It's important to blow in the reverse direction from normal flow and the car doesn't need to be running. It's not unusual to get a 1/4 cup of junk out even from a good heater. The core acts as a filter for system flakes. If "water-in" is hot and the "hose-out" is cold, then water flow is impeded and the core is getting all it can out of limited hot water.

If the doors are vacuum operated, I think may be a vacuum problem yet. Normally the vacuum is attenuated with a slow pinhole feed (hard to hear) so it doesn't slam the doors when new. Still, normal vacuum smoothly gradually builds up to full level, as in new, if the electronic control works and no tiny downstream leaks pizz it away.

As the car ages, the doors get stickier. Sometimes dust sized debris or seeds sift in and jam the doors. At the same time peak engine vacuum drops and vacuum line hoses tend to develop minute leaks. End result: slow operation and eventually nothing, from multiple causes.

Try springing vacuum diaphrams against their springload and see if they leak back faulty while you hold your finger over the diaphram vacuum line inlet. I like mechanical cable op better than vacuum because it's more stone-reliable.

We are very heater minded up here.

Wes


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