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Blue/Red temperature lever

Old 12-04-2018, 10:45 PM
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Blue/Red temperature lever

I have a 88 pickup 22RE 4WD. The temperature control lever (slides from blue to red) will not stay all the way on red. I can push it over and hold it, and the air gets a lot warmer, but once I stop holding it, it goes back to about midway and the air cools down some. Will this be something to do with the cables? I have done searches, and canít find what Iím looking for. Thanks in advance for the information.
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Old 12-04-2018, 11:40 PM
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That lever should connect directly to the heater control valve on the firewall. Have you looked under the hood to see if the valve is fully open when you move the lever to full heat?

Last edited by mholme; 12-04-2018 at 11:41 PM.
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Old 12-05-2018, 01:18 AM
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The lever controls a gate under the dash and the heater valve in the engine compartment next to the brake booster. It is two different mechanical things. If the vavle cable breaks, you can still have hot or cold air by moving the gate.
Does the under the hood valve move freely? Unhook the cable there and test in inside.
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Old 12-05-2018, 03:13 AM
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Thanks for the information. Iíll check under the hood this afternoon. I was hoping itís something simple, I just didnít know what to look for. This helps a bunch.
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Old 12-06-2018, 01:43 PM
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Okay, so I looked at the valve under the hood. I can move the cable in and out with pliers, and can open and close the valve with my hand. But once I re-connect the cable and move the control on the dash, it doesnít really move the valve. Maybe a very little. Seems like the cable may be in a bind somewhere. Guess Iíll have to pull the dash and see whatís going on?
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Old 12-09-2018, 02:51 PM
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Originally Posted by Dtay1981 View Post
Okay, so I looked at the valve under the hood. I can move the cable in and out with pliers, and can open and close the valve with my hand. But once I re-connect the cable and move the control on the dash, it doesnít really move the valve. Maybe a very little. Seems like the cable may be in a bind somewhere. Guess Iíll have to pull the dash and see whatís going on?
The valve is old and could be sticking. If it isn't that and it often is, then have fun pulling the dash.
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Old 12-22-2018, 12:27 PM
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An interesting thing happened to me the other day. I tried to change my flap setting to defrost and my heat level to full cool. Neither lever would move much and the knobs kind of went sideways when I tried. I popped the front panel off and a white clip fell out. I went ahead and pulled the control panel loose and both of the levers were loose at the pivot mount. Turned out that clip holds both of them in place allowing them to pivot. Itís a two piece snap together clip. 1 goes over top of the lever mount and 1 goes on the bottom and clips in to place. I opted to just drop in a screw and washer from the top and tightened it down with a nut over the original bottom clip. Worth checking out if you havenít figured this out yet. My truck has AC so your setup may vary a bit if you do not.

Iíll try to edit with a picture when I get back to the garage.

Last edited by mholme; 12-22-2018 at 01:49 PM.
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