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12-9-proverka-ispravnosti-funkcionirovaniya-i-vosstanovitelnyjj-remont-obogrevatelya-zadnego-stekla.html
12.9. Check of serviceability of functioning and recovery repair of a heater of back glassThe working element of a heater of back glass represents a horizontal lattice from the conducting threads pasted on the internal surface of glass. Food on a heater moves through a big safety lock from the block of the distribution of power located in a motive compartment of the car. Inclusion of a heater is made by means of the switch located on the car dashboard.
Small breaks of conducting threads of a lattice of a working element of the heater can be eliminated without dismantle of back glass.
Check
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Include ignition and a heater of back glass.
Press the positive probe of the voltmeter to the positive plug of a lattice of a heating element, press the negative probe to the negative plug. The device has to register battery tension, otherwise check a condition of a safety lock, the switch and a connecting electrical wiring. If tension normal, however, a part of the heater does not work. You pass to the following stage of check.
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To measure tension during the checks described below wind the positive probe of the voltmeter with a metal foil which it is easy then a finger will directly press to conducting thread of a lattice of a heating element. Connect the negative probe of the measuring instrument to the negative plug of a lattice.
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Measure tension in the central part of each of lattice threads. The indication in 5 — 6 V confirms serviceability of a condition of thread. The zero indication speaks about existence of break between the center of thread and a positive side of an element. Overestimate of the indication twice (10 — 12 V) happens in the presence of break between the center of thread and a negative side of an element. Serially check each of lattice threads.
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In the absence of breaks connect the negative probe to the mass of the chassis and repeat check — indications should not change, otherwise violation of quality of grounding of a lattice takes place.
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For localization of break press the negative probe of the voltmeter to the negative plug of a lattice of a heating element. The positive probe which is wrapped up by a foil begin to probe conducting threads of a lattice, moving from giving of food to weight. In a break point instrument reading has to reduce from several volts to zero.
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Recovery repair
Restoration of integrity of conducting threads is made by means of a special remnabor of the Dupont 4817 type. The basis of set is made by the conducting epoxy paste delivered complete with a hardener.
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Before starting recovery repair of a lattice of a working element switch off a heater and let's an element cool down within several minutes.
Slightly smooth out the damaged site of thread felt, then carefully wipe it with alcohol.
Paste two strips of an adhesive tape along the site of thread which is subject to restoration.
Carefully mix epoxy paste with a hardener (follow the instructions enclosed in set).
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Apply the received structure on the damaged site (with an overlap approximately in 20 mm on edges of the intact thread).
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Final polymerization of a compound happens in 24 hours after which protective strips of an adhesive tape can be removed from glass.
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