Overheating in traffic on 1990 Mazda Miata MX-5

Overheating in traffic, Fan is not coming on. A/C fan does work. Tested fan itself and works whem power put onto terminals, Can find no fuses blown. Shorting the temp sensor on the thermostat housing to earth I can hear a relay kicking in at the fuse box. have swopped that relay with one the same - problem remains - any ideas please?

by in Amarillo, TX on April 28, 2010
2 answers
ANSWER by on July 08, 2010
replace thermostat
ANSWER by on December 28, 2010
Same happened to me, fans weren't turning on even after i got new fan motor's. The thermostat sensor wasn't connecting with the thermostat properly... so i got a plastic tie and adjusted the thermostat sensor in a position that made contact and therefore activating the fans (definitely ghetto rigged)
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My engine overheats if I run the a/c while driving at highway speeds. No problems at highway speed without a/c. No problems in town with a/c.

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