Mk Mudpie

New Member
Hillo people , hope you all had a good christmas , now , my heater only works full blast , ive changed the whole heater box an the final stage unit that lives under the scuttle panel and it does the same as when i started , 93 rrc v8 auto , at a bit of a loss now , ive read else where that there are relays somewhere , any body tell me where please and any thing else that i should be looking at ??? Many thanx
 
Hillo people , hope you all had a good christmas , now , my heater only works full blast , ive changed the whole heater box an the final stage unit that lives under the scuttle panel and it does the same as when i started , 93 rrc v8 auto , at a bit of a loss now , ive read else where that there are relays somewhere , any body tell me where please and any thing else that i should be looking at ??? Many thanx

Think maybe there is a resistor pack that controls the fan speeds. This will be duff change it.
 
Resistor pack , this being the bit that lives under the scuttle panel , you can see it through the vents behind the bonnet next to the wiper motor ? if so already changed it , no differance
 
Resistor pack , this being the bit that lives under the scuttle panel , you can see it through the vents behind the bonnet next to the wiper motor ? if so already changed it , no differance

Then the one you put on is duff. Unless you have got a wire crossed somewhere. The fan control switch just diverts power to sections of resistor pack to lower voltage and reduce fan speed. If fan does not work on 1,2,3 but works on 4 then resistor pack is duff. If fan is at full speed on all settings you have a wire in wrong place or a short somewhere i would think.
 
Changed relays , no differance , the final stage resistor was reputed to come from a working car although i can't prove that , blower works on 4th setting only , wires not crossed as its all plug on plug off , ive changed the heater unit and even the switches on the unit
 
Changed relays , no differance , the final stage resistor was reputed to come from a working car although i can't prove that , blower works on 4th setting only , wires not crossed as its all plug on plug off , ive changed the heater unit and even the switches on the unit

Then it can only be the resistor pack. The fact that fan runs at all would indicate relays are ok.
 

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