Rear A/C Blowing Hot Air
#1
Rear A/C Blowing Hot Air
On my '98 Windstar the rear A/C is blowing hot air. Additionally the air is coming out of the incorrect vents, the ones that the heat normally comes out of.
It appears that the valve under the rear A/C unit is vacuum actuated, and I would assume that the louvers to control the air flow are also vacuum actuated. If this is correct, I would assume that I have a vacuum problem? However if it was a vacuum leak wouldn't the performance of the vehicle also show this?
Any help would be greatly appreciated!
It appears that the valve under the rear A/C unit is vacuum actuated, and I would assume that the louvers to control the air flow are also vacuum actuated. If this is correct, I would assume that I have a vacuum problem? However if it was a vacuum leak wouldn't the performance of the vehicle also show this?
Any help would be greatly appreciated!
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Rear A/C Blowing Hot Air
I have the same problem. Did you resolve you problem? I believe it is a vacuum problem. I measured 4 in Hg at the hose going to the air flow damper - not enough to change the air flow when the air conditioner is on so the air comes out the bottom (heater) vents. I am not sure what the vacuum level should be here. Must be a leak somewhere.
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Rear A/C Blowing Hot Air
Kangaroo:
Yes I solved the problem. Replaced the rear control switch in the dash and it solved the problem. The switch is a combination electrical/vacuum switch. The fellow at the parts room new exactly what the problem was and was sure enough of it to warrant an electric part should it not be the culprit! Must be a pretty common part to fail.
Yes I solved the problem. Replaced the rear control switch in the dash and it solved the problem. The switch is a combination electrical/vacuum switch. The fellow at the parts room new exactly what the problem was and was sure enough of it to warrant an electric part should it not be the culprit! Must be a pretty common part to fail.
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Fixed my van with same problem.
I realize the original post was a number of years ago, but I figured people were still having this issue and wanted to share what I did to fix mine. I have a 2003 e250 Econoline custom van. I noticed the problem was I was getting no air coming out of the vents in the front, just on defrost. I was also having the issue described in the original post of no rear heat even though the air was blowing through the vents.
The the front vent issue was a vacuum hose connected to the reservoir tank had gone bad. The problem is the only way to get to the reservoir tank and replace it is to take the entire dashboard out, so I bypassed it and installed a secondary reservoir tank. As soon as that was hooked up and it restored vacuum to the system, I have my front vents immediately.
The second issue was rear heat. In the rear of the van I have a second blower motor, and the blue vacuum line that runs from the front dash goes to the back and connects to a control module in the back. That blue line was not holding a vacuum and was not switching the blend door that controls the temperature to the rear fan. I disconnected the blue hose under the dash and from the rear module. I ran a new vacuum line as a replacement, and it worked instantly. It is still a long ways for the hot air to get back, so it does take a little while for the air to truly get warm coming out of the vents... Idling it just barely gets warm but whenever I'm driving it does heat up the rear of the van.
The the front vent issue was a vacuum hose connected to the reservoir tank had gone bad. The problem is the only way to get to the reservoir tank and replace it is to take the entire dashboard out, so I bypassed it and installed a secondary reservoir tank. As soon as that was hooked up and it restored vacuum to the system, I have my front vents immediately.
The second issue was rear heat. In the rear of the van I have a second blower motor, and the blue vacuum line that runs from the front dash goes to the back and connects to a control module in the back. That blue line was not holding a vacuum and was not switching the blend door that controls the temperature to the rear fan. I disconnected the blue hose under the dash and from the rear module. I ran a new vacuum line as a replacement, and it worked instantly. It is still a long ways for the hot air to get back, so it does take a little while for the air to truly get warm coming out of the vents... Idling it just barely gets warm but whenever I'm driving it does heat up the rear of the van.
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Jawbreaker
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