C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1987 ith a new issue

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Old Jun 9, 2015 | 08:17 AM
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Default 1987 ith a new issue

59K miles, had it one month. Thanks for the help on the other issue.


When I got it the hot to cold on the climate control was very stiff, but all worked. Now the heater motor does not blow on the heat setting and the heat control does not worked. The AC still blows cold on max, norm, the vent blows but again no thermostat control.




I have read threads on these issues but not both at the same time.




Thanks in advance
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Old Jun 9, 2015 | 07:35 PM
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Default Update it is the heater control valve non digital control panel

Originally Posted by Odontia32m
59K miles, had it one month. Thanks for the help on the other issue.


When I got it the hot to cold on the climate control was very stiff, but all worked. Now the heater motor does not blow on the heat setting and the heat control does not worked. The AC still blows cold on max, norm, the vent blows but again no thermostat control.




I have read threads on these issues but not both at the same time.




Thanks in advance

I was wrong the heater does work in heat mode. The heater control valve does not work. If manually extended it does heat and when put on cold it retracts and cooler air starts. I lubed and worked it with WD40 but it will not extend when put on heat.

Any ideas would be appreciated.
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Old Jun 9, 2015 | 10:24 PM
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There is strong vacuum when in the cool setting.
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Old Jun 12, 2015 | 09:17 PM
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somebody will reply whos shared your problem. so far i havn't had this issue.
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Old Jun 14, 2015 | 07:40 PM
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Originally Posted by VikingTrad3r
somebody will reply whos shared your problem. so far i havn't had this issue.
Thanks,

I am going to replace the heater valve with one from a 75 pickup like I found out how to do on here.
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Old Jun 15, 2015 | 12:39 AM
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a 75 pickup shares a part with the c4?
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Old Jun 15, 2015 | 02:33 PM
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Originally Posted by VikingTrad3r
a 75 pickup shares a part with the c4?
Sorry 82-84 pickup. It is here and a great write up with good pics.
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Old Jun 15, 2015 | 02:36 PM
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do you have the link?
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Old Jun 15, 2015 | 04:09 PM
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Originally Posted by VikingTrad3r
do you have the link?
https://www.corvetteforum.com/forums...-corvette.html
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