Sehka77 Posted May 22, 2021 Share Posted May 22, 2021 Hello, have a 90 rd model w e6-300 mechanical . I seems engine fan is on constantly on is this normal ? Also would like to wire a manual switch to turn it on & off no a/c from factory any help would greatly be appreciated thank-you Quote Link to comment Share on other sites More sharing options...
0 Joey Mack Posted May 22, 2021 Share Posted May 22, 2021 A 90 model with an E-6?? and with an air operated fan, not a viscous fan clutch?? I'm about to learn something here. Mabey Glenn or F, will answer this one for you. Quote Link to comment Share on other sites More sharing options...
0 Sehka77 Posted May 22, 2021 Author Share Posted May 22, 2021 It's 1990 rd690 w/ e6-300 has fan clutch not not way to wire a switch on it Quote Link to comment Share on other sites More sharing options...
0 Rob Posted May 22, 2021 Share Posted May 22, 2021 Horton used to market an air fan clutch kit but not any longer shown here: They don't seem to offer any upgrades either. Replace the viscous fan clutch assembly as they usually default to full time operation when no longer working correctly meaning sensing temperature correctly. Better to over run the fan than not run it and cook the engine. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
0 MACKS Posted May 22, 2021 Share Posted May 22, 2021 43 minutes ago, Sehka77 said: It's 1990 rd690 w/ e6-300 has fan clutch not not way to wire a switch on it Can u post a picture or two ? Quote Link to comment Share on other sites More sharing options...
0 Rob Posted May 22, 2021 Share Posted May 22, 2021 Engine would have to be a transplant into the chassis but I've seen similar so not doubting. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
0 Sehka77 Posted May 22, 2021 Author Share Posted May 22, 2021 Ron, thanks for the help .. and yes I sense fan clutch to be faulty seems to to run or be on at all times .... ..ill look into replacing it ..also truck original..has original engine From factory Quote Link to comment Share on other sites More sharing options...
0 Sehka77 Posted May 22, 2021 Author Share Posted May 22, 2021 Mack's...... pictures of what ? Truck ? Or engine fan clutch? Quote Link to comment Share on other sites More sharing options...
0 Swishy Posted May 22, 2021 Share Posted May 22, 2021 Normally the sender to switch on engine fan is via a temp sender unit in radiator or pipes from engine to radiator some makers wire up the fan clutch to also engage when Air conditioner is on suggest: check AC wiring cya Quote Link to comment Share on other sites More sharing options...
0 Sehka77 Posted May 22, 2021 Author Share Posted May 22, 2021 Squishy, thanks for your help , all mechanic engine , factory no a/c and fan clutch, so not air actuated .. so I'm guessing I cannot wire a switch to do it manually Quote Link to comment Share on other sites More sharing options...
0 mrgumby Posted May 23, 2021 Share Posted May 23, 2021 Does your fan look like the one in the picture I’m pretty sure it does you can not stop that fan from spinning it works on a temp sensitive clutch it just spins at different speeds as it warms up and cools down 1 Quote Link to comment Share on other sites More sharing options...
0 Hayseed Posted May 23, 2021 Share Posted May 23, 2021 2 hours ago, Sehka77 said: Mack's...... pictures of what ? Truck ? Or engine fan clutch? I think We'd all like to see pictures of the Engine & the Fan Hub from BOTH sides.......!! 1 Quote "Be who you are and say what you feel...Because those that matter...don't mind...And those that mind....don't matter." - Link to comment Share on other sites More sharing options...
0 theakerstwo Posted May 23, 2021 Share Posted May 23, 2021 I had a 96 RD that had a air fan Quote glenn akers Link to comment Share on other sites More sharing options...
0 Sehka77 Posted May 23, 2021 Author Share Posted May 23, 2021 Mrgumby ,yes thats it .. so that's correct because seems to be on at all times but spins different speeds .... I thought it was defective because @ cold start fan Is on ..and truck runs good no issue does not over hear Quote Link to comment Share on other sites More sharing options...
0 Sehka77 Posted May 23, 2021 Author Share Posted May 23, 2021 Hayseed , I don't have pictures of it now but Mr. Gumby is correct looks just like it and seems to operate as he described.. thanks for you help all you guys 1 Quote Link to comment Share on other sites More sharing options...
0 MACKS Posted May 23, 2021 Share Posted May 23, 2021 A quick way to check,when engine is cold you should be Able to spin the fan pretty easy.. Quote Link to comment Share on other sites More sharing options...
0 Sehka77 Posted May 23, 2021 Author Share Posted May 23, 2021 Thanks Joey Mack , I can spin fan when cold , so I'm sure it's working properly thanks for help everyone Quote Link to comment Share on other sites More sharing options...
0 Rob Posted May 23, 2021 Share Posted May 23, 2021 If it's original to the chassis I'm wondering if a glider kit? Can't remember if the RD series was offered as a glider that late or not however. There are written procedures for testing the operation of a thermostatic viscous fan clutch and only requires a piece of cardboard and non contact thermometer. Basically with the engine under 100 degrees(F) pull the fan through a few rotations by hand till it eases in effort to turn. Then start the engine and with the radiator blocked allow to warm to about 200-210 degrees(F), shut the engine down and physically pull the fan blade around, (by hand). The effort needed when hot should be significantly greater than when cold. If near rigid, the fan clutch is good. If still relatively easy to turn the fan by hand, replace the marginal fan clutch. 2 Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
0 Joey Mack Posted May 23, 2021 Share Posted May 23, 2021 I'm curious why I have a (-1) next to my name on on of my posts.? I know I could start a thread in another forum, just looking for a short answer... Jojo Quote Link to comment Share on other sites More sharing options...
0 Mark T Posted May 23, 2021 Share Posted May 23, 2021 Are you sure the radiator isn't dirty on the outside ? As in plugged up with dust and such between the cooling fins, not letting air flow through it as it should. Maybe that fan is working exactly like it should ? Quote Link to comment Share on other sites More sharing options...
0 Joey Mack Posted May 24, 2021 Share Posted May 24, 2021 i don't see where you posted that it is running Hot. Do you have other issues? Quote Link to comment Share on other sites More sharing options...
0 Sehka77 Posted May 24, 2021 Author Share Posted May 24, 2021 Mack t ,ill look in to it not sure , thanks for help also Joey Mack it's running fine not over heating Quote Link to comment Share on other sites More sharing options...
0 Joey Mack Posted May 24, 2021 Share Posted May 24, 2021 good deal... jojo Quote Link to comment Share on other sites More sharing options...
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Sehka77
Hello, have a 90 rd model w e6-300 mechanical . I seems engine fan is on constantly on is this normal ? Also would like to wire a manual switch to turn it on & off no a/c from factory any help would greatly be appreciated thank-you
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