Ford Aerostar :: Heat Does Not Work - Missing Or Broken Thermostat Cause This?


Apr 24, 2012

I have yet another issue with my lovable Aerostar. This one I just noticed today. The heat doesnt work! Not that its very needed here in Florida, but its still an issue. I tried the heat function out multiple times today and even after driving for a good 20 minutes hot air does NOT come out! Only cool air comes out the vents. Well actually, for a few seconds when I turned the heat on it sort of felt "slightly warmish" but a few seconds later it was cool again. I don't know if this could be related but the temperature gauge is stuck at C (Cold) as its been since I purchased the van about a week ago.

I brought the van to my friend who's a mechanic and he looked under the hood and claims there is no thermostat, the previous owner must have removed it. I found this odd since the vehicle has yet to overheat and I know overheating is sure to happen when the thermostat is missing. Need to confirm if these signs are indeed because of either a broken or missing thermostat? If it is, I have yet another problem. I began looking on eBay for a new thermostat and there's all different kinds! Some say "190 degree" some say "180 degree" and some say other things. Here's a link to a "190 degree":

MOTORCRAFT RT-1152 Thermostat

If I do need a new thermostat, what kind do I need? Here's the exact van I have: 1989 Ford Aerostar XLT V6 with 4 speed auto transmission. Oh and just in case this has anything to do with it, the van has A/C but it's not currently working.

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So my issue, had heat last year, turned on first time this year and its cold. So I did some research on the site and have done a few things but still no heat

First thing I did was flushed coolant system and add new coolant as I have 235,000 miles on the truck and it looked rough

Ran the truck for a while and checked heater core hoses, they were both warm, not hot by any means so I pulled the thermostat and replaced the thermostat and gasket

Now the hoses to heater core are both hot and my temp gauge went up about 1/4" higher than it ever has, but still no heat.

Blows fine, just cold or sometimes luke warm. I pulled the glove box back to try and see I I could hear anything when I change from hot to cold and I hear or see nothing. Only movement I see is when changing cycles from defrost, heater, ac... So could this be a blend door issue an how do I get to the blend door, is it behind the big plastic plenum box?

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So I went online and ordered one from Direct Ford Parts and it did not match. The part number was FMC-F49Z9A825JA. In the parts catalog it says it fits 92-97. Not even close. The one I have has a screw off top and the one sent has a bolt on housing.

1997 Ford Aerostar 4.0 ... I really need my cruise control ...

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He's not charging me labor for the initial diagnosis, since he didn't fix anything. (That's how he works), but I'm going to get charged for the 5-7 hours it takes to replace the Thermostat. My question is, is there an easier way to do this, or is 5-7 hours realistic?

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Here are the codes that were scanned when I took car to a local parts store:

Coolant Temperature Sensor Evaporated Emission System (Vacuum Leak)
p3193
Accelerator Pedal Position Sensor
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" High

I replaced the thermostat and now I get the red light displays on the dash anytime I go over 45 and the thermostat light on the panel displays there is a problem. I think there might be air in the system. Should I have a mechanic bleed air out or is there an easy procedure that I can do on my own to fix this problem?

I have also purchased a water coolant valve and this will be my next part to replace at 106.00 dollars. I am not sure this will fix my problem with my heat but I do not want to replace the heater motor because those run 630 dollars each.

Being that it is winter I want to fix the problem so that we can drive the car with some heat and not get the red light to come on intermittently. How to get to the root of these problems listed above?

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The 5 blade-fan comes on as soon as I turn the engine on and the radiator appears to be working just fine, cooling fluid moving and no leaks.

I am a landscaper in NYC and often haul heavy loads through slow moving traffic in the city and would love to drive relaxed and not with my eyes fixed on the temperature gauge awaiting impending disaster.

What is the best course of action?

a) change the clutch and see how it goes...

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