mines the opposite, only runs on high, probably fix it .....sometime around summer
AC/Heater Fan problem
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Joined: Oct 2001
Posts: 63
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From: Topeka Ks
AC/Heater Fan problem
86 manual controls, AC/Heater blower will not run on High. Low, and medium speeds work fine. I've searched other threads, done some testing, and think maybe the fan motor itself is the problem?
There is voltage at the appropriate pins on the Relay at each fan switch setting. With the Relay removed, I can run a jumper from the 12v Red wire to the Red/black wire and the fan runs on high, so I thought it must be a bad Relay. $7.99 for a new one, so not much harm in trying.
Put in a new Relay, switched to high fan setting, and it blew the 25amp fuse on the main fuse panel, and the new relay was so hot I could barely touch it.
I replaced the 25amp fuse, put in the old relay, and back to having all speeds except high.
So is the Fan motor drawing too much current when trying to run on HIGH? How do I test the fan motor to see if it is bad?
I can do about anything mechanical. Electrical - not so much. I can use a basic volt meter, but my that's about it.
There is voltage at the appropriate pins on the Relay at each fan switch setting. With the Relay removed, I can run a jumper from the 12v Red wire to the Red/black wire and the fan runs on high, so I thought it must be a bad Relay. $7.99 for a new one, so not much harm in trying.
Put in a new Relay, switched to high fan setting, and it blew the 25amp fuse on the main fuse panel, and the new relay was so hot I could barely touch it.
I replaced the 25amp fuse, put in the old relay, and back to having all speeds except high.
So is the Fan motor drawing too much current when trying to run on HIGH? How do I test the fan motor to see if it is bad?
I can do about anything mechanical. Electrical - not so much. I can use a basic volt meter, but my that's about it.
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
It's intact, not broken, I'll get a new one just because its old ($18) and this weekend I'll pull the blower motor and check the voltages per the manual, a motor is only $20 so I'll probably replace it too.
I do PM/replace old parts that are still stock i.e 1985 original whenever I take the old stuff out if it is $25 or less kind of cost, with my luck it always does after I put the old stuff back in so I figure its better to just replace it
Le Mans Master
Joined: Aug 2010
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http://www.justanswer.com/uploads/su...0157_relay.gif
this should work, the relay is usually the one with the stainless cover
this should work, the relay is usually the one with the stainless cover
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