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If both doors only open with the key, it is the control unit, if one power lock works and the other doesn't with the key, it is a connecting rod in teh door not working under power, or a bad actuator, they are available from both pelicanparts.com and paragon-products.com for around 3.00, I believe the actuators are available too, take a look....
Left hand side of the drivers foot well above the hood release....
Mine didn't work either, until I replaced the $1.09 heater clip that controls the airflow mixer valve (located under the cover on on the left hand side of the HVAC blower assy in the right side of the drivers foot well, Could also need a recharge of freon, but the heater clip is an easier place to start to look if you want to buy it. If you look under the dash on the right side of the drivers foot well, you will just be able to see the HVAC blower... The rod that connects to the mixing valve will be dangling inside the cover you can just see (the cover is secured with 3 screws) but the rod will be hanging loose inside the cover and will be visible if you look at the lower opening The other method to diagnose is if the heat never shuts off, even when the heat knob is all the way to cold.... just an idea....
I just had my Belt re-tensioned after replacement, the re-tension was $196, when the belt was replaced I did not need and others (normal wear items to change are rollers/tensioner/water pump) and I had the motor mounts replaced for a grand total of $1200, but is much better than the 2-3 K for a head rework if the belt fails. As for longevity or life of the belt, I use my 88 944 as my daily driver, mostly highway at speeds of we'll just say probably too fast... Replace the belt, re-tension it at 1000 miles later, 15K and replace again at 30K or two years whichever comes first is what my friendly local dealer (Euroclasics Porsche, located in Richmond VA) has told me, so far I got the replacement, and the re-tension, and I am about 12K away from the second re-tensioning at the pace I am driving this car it will be due some time next summer as I have accrued 4500 miles in a month and a half (I commute 1000 miles or so a week), kinda expensive, but the looks on other drivers faces ... Timing Belt and Motor Mounts...$1200 Re-Tension.............................$196 Re-Tension.............................$196 Ragged out Corvette drivers face when you stomp him straight line on the highway..............PRICELESS Yes his mid 90s corvette was ragged out, but it was still very funny to accelerate past him not one, not twice but 3 times a lady.......