95 Avalon overheating problem.

Cooling fan doesn't seem to be coming on and engine is overheating in
traffic. When Engine Coolant Temperature (ECT) switch #1 is
disconnected, the fans come on. It seems I need a new ECT #1. Anything
wrong with my analysis? Toyota wants nearly $100 for this switch which
is unbelievable. Any other reputable sources for this part at a more
reasonable price? Thanks.

Per the Toyota Repair Manual (p. EG201):

No. 1 EGT switch is open at temps above 208F (98c) and closed below
190F(88c)

(similar for #2 ECT switch, but 93c/83c open/close temps)
"resers@bellsouthgarbage.net" <resers@bellsouth.net> wrote in message
news:1146838979.884572.31050@i39g2000cwa.googlegroups.com...[color=blue]
> Cooling fan doesn't seem to be coming on and engine is overheating in
> traffic. When Engine Coolant Temperature (ECT) switch #1 is
> disconnected, the fans come on. It seems I need a new ECT #1. Anything
> wrong with my analysis? Toyota wants nearly $100 for this switch which
> is unbelievable. Any other reputable sources for this part at a more
> reasonable price? Thanks.
>[/color]

"resers@bellsouthgarbage.net" <resers@bellsouth.net> wrote in message
news:1146838979.884572.31050@i39g2000cwa.googlegroups.com...[color=blue]
> Cooling fan doesn't seem to be coming on and engine is overheating in
> traffic. When Engine Coolant Temperature (ECT) switch #1 is
> disconnected, the fans come on. It seems I need a new ECT #1. Anything
> wrong with my analysis? Toyota wants nearly $100 for this switch which
> is unbelievable. Any other reputable sources for this part at a more
> reasonable price? Thanks.
>[/color]

There is a specific temperature at which the switch should open or close,
which Tom418 was kind enough to provide.

Rather than just unplugging the switch, check continuity with the engine
warmed up and cold. You should have continuity when the coolant is cold and
open circuit when the coolant is hot.
--

Ray O
(correct punctuation to reply)